Malicious PDF — malware analysis report

Static analysis result for SHA-256 916b170cd44c1dab…

MALICIOUS

PDF

76.7 KB Created: 2021-09-03 13:56:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7019f8534e4dc2a8c0864e01a268a311 SHA-1: d0cd0ebfde5173014df7a570defce83c4ec0b8e2 SHA-256: 916b170cd44c1daba2a094c6ba1fc7e04a8c3fd07f2914f99f4231dccfa430fd
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The 'Fake CAPTCHA' heuristic indicates the document likely presents a deceptive prompt to the user, aiming to trick them into executing further actions. The numerous embedded URLs, many pointing to disposable hosting or compromised CMS uploads, suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 7

  • 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.
  • 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://queure.ru/uplcv?utm_term=suzuki+baleno+2016+service+manual+pdf PDF link annotation
    • http://ahcxdq.com/uploads/file/020609469481.pdfIn PDF document text
    • https://perfectprojects.ro/userfiles/file/nemeluganidekijopiludiv.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/jdj0hc517qpd9km9s5tfuih0d3/parikanuwelenexegisab.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f00ac492ccf---nabitizepa.pdfIn PDF document text
    • http://gldbirdgel.com/user_img/files/4312101322.pdfIn PDF document text
    • http://marymo.ru/uploads/files/bugixop.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/elbegcd90o6dp0qs0ttro6lj3r/nurejakuwikesogalo.pdfIn PDF document text
    • http://forglass.sk/userfiles/file/41479626650.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611ce208a0a09---700154931.pdfIn PDF document text
    • http://langfordfinancialservices.com/userfiles/files/mepuposozowipo.pdfIn PDF document text
    • http://misosmile.com/upload/editor/files/41751014025.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081783d58839---bedelifajovokojuvar.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/24033255232.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ab6252b78e9---68194103353.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/nosanep.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210630122858294.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b245c5059ca---xomoxudipogevawa.pdfIn PDF document text
    • https://webmenuplus.com/images/file/sajuzod.pdfIn PDF document text
    • http://perchegouet.com/ckfinder/userfiles/files/julapiwipilotemunakaf.pdfIn PDF document text
    • http://mudrberanova.cz/userfiles/file/sirasolawokuvewugebagip.pdfIn PDF document text
    • http://kperrylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/momegi.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1d52bdf826---97938367978.pdfIn PDF document text
    • https://badoza.net/userfiles/file/46689499748.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df8c976c070---kipijuxugiwezopem.pdfIn PDF document text
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bfcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFCF 18528 bytes
SHA-256: 9b3c44600ea4da3e6c5c86384878c281f734b26efcde993900826e895fff1121
font_01_sfnt_off0000efa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B8 11676 bytes
SHA-256: 0f1057f28038b49a02892ff617c676f3b2b75396d598068641908938afc8a9eb

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