Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4a5a725dc0defa4…

MALICIOUS

PDF

95.7 KB Created: 2021-07-30 03:24:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3d30d26c6f758f24288f00a8ba4c3e33 SHA-1: fa1f6dae0d1a3464b7657c57630df83146d262f2 SHA-256: f4a5a725dc0defa4c3baaf625de22b18d31178a441aa78c8994f8a1b019da40b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features a link farm pointing to multiple compromised WordPress sites, indicating an attempt to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://bmcnx.com/userfiles/file/zigipa.pdf In PDF document text
    • https://georeno.ca/userfiles/files/30424282610.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16084e5851a336---xazopofumotalanim.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160ab72ea6095f---zuzurizokujudaveg.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b3b2f88ecde---45799780034.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16072481dbfa48---22421129528.pdfIn PDF document text
    • http://webinaris.org/ckfinder/userfiles/publics/files/lakum.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/bd740289db3aa47828785b0ef857a32a/nelolavamupoxopowu.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b0a7041d0e0---wexivoxubetafasuvosezer.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/125d550ef09130ce1aa1167c38ae33a2/23142948661.pdfIn PDF document text
    • https://www.winsum.frl/ckfinder/userfiles/files/19834681536.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2930c88fa9---tibevepatedewunamiwasije.pdfIn PDF document text
    • http://jtipartner.com/ckfinder/userfiles/files/lapomexaporuvixuw.pdfIn PDF document text
    • http://www.zima.snowcat.pl/admin/ckfinder/userfiles/files/melofukotir.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607494ef7b880---bapuxivujejavenor.pdfIn PDF document text
    • http://kryotherapie.net/neu/userfiles/file/6943925303.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae9d280b0c8---4476744785.pdfIn PDF document text
    • http://jagodkaprzedszkole.pl/userfiles/file/28222224530.pdfIn PDF document text
    • http://acmemask.com/upfiles/editor/files/15761722183.pdfIn PDF document text
    • http://hutergroup.de/userfiles/file/tagirojinusotafuzugida.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ecdd5979028---23745777850.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/85227411945.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/7db01be2f15da12c09e41eae012d026f/39295260523.pdfIn PDF document text
    • http://www.artefuoricentro.it/js/lib/ckfinder/userfiles/files/lenonabomokuduzude.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/vimojitesaporuj.pdfIn PDF document text
    • http://kppzp.pl/userfiles/file/52162581485.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=ethical+hacking+and+cyber+security+in+nigerian+telecommunication+industry+issues+and+solutionsPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010ce5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE5 17680 bytes
SHA-256: 3b13c22915ef31aa2786a4f46fdbf55122dea46c620a631ccf864749b8551052
font_01_sfnt_off00013af0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AF0 11244 bytes
SHA-256: 57352ed65aad864acf72f5416b090956a5acc2c2c06c0fd250d2d0edb7236d44
font_02_sfnt_off000154f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1