Malicious PDF — malware analysis report

Static analysis result for SHA-256 845f4aeaee422b8c…

MALICIOUS

PDF

69.5 KB Created: 2021-09-24 03:16:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a5b10b6e3daa1ee5aee1ecc4fa6b901f SHA-1: 13d6ce8cc7e13493e332383fdee8603ef70ee612 SHA-256: 845f4aeaee422b8cf901a973209f043ba145f6efbd4bc27663337c51e898044c
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing embedded JavaScript and a large number of external links, many hosted on compromised or disposable domains. Heuristics indicate it's a link farm designed to lead users to malicious content, potentially for phishing or scams. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • 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.
  • 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 https://www.igescanada.com/ckfinder/userfiles/files/bepifavuw.pdf
    • http://beautybybelief.com/admin/images/file/49216513963.pdf
    • http://ad.ditroinfotech.com/laportal/ckeditor-ckfinder-integration/uploads/files/4387107149.pdf
    • https://apexsafetyproducts.com/ckfinder/userfiles/files/kizozerolokelixem.pdf
    • http://feuerwehrobrigheim.de/upload/files/43421996080.pdf
    • http://telegid.tv/userfiles/file/76400345685.pdf
    • http://concilianavarra.com/userfiles/files/81267982762.pdf
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/59018559437.pdf
    • http://chpcentre.com/files/file/valetonixanepo.pdf
    • https://altonika.pro/files/fck/file/tofumofowizotuze.pdf
    • http://terezmisszio.eu/files/file/xeloke.pdf
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/78abe7380be18b1cb491258ba18bb860/57827421255.pdf
    • http://otestmanager.org/club/data/userfiles/file/20210909160853.pdf
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/bijame.pdf
    • https://signika.pl/Upload/file/voworoxejibus.pdf
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef40f60ab6---10603244274.pdf
    • https://metrosecuritynepal.com/assets/userfiles/files/83390190859.pdf
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612feafdabdcb---5863388309.pdf
    • http://kme-kme.cz/files/file/fabukogo.pdf
    • http://boathousebrokerage.com/userfiles/file/nomafimefoxap.pdf
    • https://avukat.dnsaktif.net/upload/files/bogorobotusego.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=pubg+latest+apk+data
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b0a0.bin
751471191662c899fe4af5242d747d3ee35977f1c1748930b3844502b4f8ff23
pdf-font-stream PDF embedded font (sfnt) at offset 0xB0A0 16040 bytes
font_01_sfnt_off0000d98f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD98F 16792 bytes
font_02_sfnt_off0000f1a6.bin
9a4b52ba3e5996070807f5d36b742b2f1584f58f46c03b0763b2e19e9b741eca
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A6 10484 bytes