Malicious PDF — malware analysis report

Static analysis result for SHA-256 e113bde4f3ee7c69…

MALICIOUS

PDF

99.1 KB Created: 2021-08-06 23:59:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 988db9eb9fe7075947d77d33464468a7 SHA-1: 6beed6053625852578a638ad5eeaad6428600341 SHA-256: e113bde4f3ee7c69f8171039d3e1f88b61eb6d40297396627e39153207f2d7e1
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF document is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing or trojan delivery mechanism. The primary attack pattern involves presenting a fake CAPTCHA to deceive users into executing further actions, likely leading to the download or execution of a secondary payload. Several URLs extracted from the document point to compromised CMS upload storage and link farms, suggesting a distribution network for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9910

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b6c5967b30---91241438402.pdf In PDF document text
    • http://world-spa-resorts.com/dok/22345630084.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/16091752af0d8c---74990720316.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9dc440e5c---28339326869.pdfIn PDF document text
    • https://zop.bg/webroot/img/content/files/14632499817.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/921248f49b81be1f7a31b348375acd9e/92750790949.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4cdae02e71---30216515188.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610b5120af31b---zagasuro.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/26qd4kg5942hn2mv78iqrr4evt/53465692358.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/96538a1696a41aeee87ec23cdcfed956/rudonuj.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/6pv3h39ig5e1kh18l7o97dm034/60486046804.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b9461e22da8---vodulibufisi.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160719bd43d7ec---nukilidipifelinogajigepa.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed7bfeaf62---sodutab.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160975b20486fe---22582117319.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/82334276791.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160d9fd0b16d70---wuludowapawapipogogu.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aeaf8c5ee88---13381802290.pdfIn PDF document text
    • https://anfauglir.com/images/file/5372811079.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/16091f95041a5d---46031303645.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/nondut5bfie2ggla29vqervuu2/19749348103.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/k0k0ss55jsgdunm1cg8mnjs4gp/18737876634.pdfIn PDF document text
    • https://fcksa.com/ckfinder/userfiles/files/81048018230.pdfIn PDF document text
    • https://zoorichi.com/temp/fckeditor/file/ranuzowif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=marvel+spider+man+2018+android+apk+downloadPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000104e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E4 17500 bytes
SHA-256: 0a9c88fd4d7283fe2411ee4810660b62965b4ba3434a2c63847f2feebc022260
font_01_sfnt_off000132db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132DB 16344 bytes
SHA-256: 5cd8a120e106fc2d4fc1855603a636a3ce922decfb1b4d98f17a4a5450337c58
font_02_sfnt_off000148d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000160eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160EB 11192 bytes
SHA-256: 59e5663026dddc30da1e5a469609fb08e7ec1321e235d9c05219fed1ba1c226f

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