Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf3e3679ca214c57…

MALICIOUS

PDF

76.9 KB Created: 2021-09-03 14:24:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8e3752111df5adc8096a9e11628c2fc3 SHA-1: 98c162d368b70e80703c44dd5aa0ae02406cb429 SHA-256: bf3e3679ca214c57702125835137e319349b0aa5c70da6fdacf68add6142368b
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The document contains a link farm pointing to numerous websites, many of which are hosted on compromised CMS upload directories, suggesting an attempt to distribute malicious content or conduct phishing. The presence of external URIs and the overall structure indicate a likely attempt to redirect users to malicious sites, potentially for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/s9i081eqjcldlkovm506hiq0kq/36811935540.pdf In PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/e64e0589324f715aaf42511b5fb3d51b/67886585969.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/3rsq0cc65ts0htl3p9ie5ataps/wuwekum.pdfIn PDF document text
    • https://tresonance.org/uploadfiles/95569591699.pdfIn PDF document text
    • http://geose.ru/userfiles/file/97556278052.pdfIn PDF document text
    • http://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/47598054555.pdfIn PDF document text
    • http://azseal.net/uploads/userfiles/file/nisulowadudezu.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/gefig.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/161080b145ff55---deduxaxuzepedopozofeviv.pdfIn PDF document text
    • https://bursakaynak.net/userfiles/file/selixetemegikabipila.pdfIn PDF document text
    • https://elbag.net/wp-content/plugins/super-forms/uploads/php/files/e9166cca8c216b56af71f56dfc0acf8c/vezitozo.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f35fe78a1---volegogadumeke.pdfIn PDF document text
    • http://imtac.net/upload/files/64588202216.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a819fc0b5ec---10334133360.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/bedcd59d265b6a9f1dacd3b86a5bf7b7/kimapi.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/c37f945e03dfef9ccb4bae271649d2fa/jezedisigu.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c1e66d1a1---fopeboluvax.pdfIn PDF document text
    • http://smeclassof1987reunion.com/clients/37165/File/kesipulatenofizadirivijuz.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/17328728387.pdfIn PDF document text
    • https://koetec.com/home/~ptow/public_html/ckfinder/userfiles/files/sifad.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/6bfcc8398d3d9d0a361d71400092dabd/42339251365.pdfIn PDF document text
    • http://hoskinspugs.net/clients/40498/File/sinapu.pdfIn PDF document text
    • https://franchise-vietnam.com/app/webroot/img/files/14489679889.pdfIn PDF document text
    • http://globomax.eu/userfiles/file/rexunakuxemu.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1c4fa73018---7422029615.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=general+physics+1+book+pdf+depedPDF link annotation
    • http://zs.tom.ru/jsplugins/ckfinder/userfiles/files/fofonuliwede.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_off0000c841.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC841 16732 bytes
SHA-256: 696b1dc49df2ea0903c835f9d703b9c9afedd78d00343f16aa0e170348b697cf
font_01_sfnt_off0000f3b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010bcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BCC 11056 bytes
SHA-256: 88a96512da2311da55dc0d31984df73f277f0523f8622608f4baf0630483a68f