Malicious PDF — malware analysis report

Static analysis result for SHA-256 e287b1b725bc9676…

MALICIOUS

PDF

76.4 KB Created: 2021-05-12 08:50:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ba7ac57c95de177ebac0aaa8ec386bc2 SHA-1: f85de82d510c9a3ded857cf76d100bad838e6aae SHA-256: e287b1b725bc9676de36df99c3d7d380ef68fc79bae78bd837695b01ec67da9d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is identified as malicious by ML classifiers and ClamAV, specifically flagged as Pdf.Phishing.Trojan. Numerous heuristics indicate the PDF contains a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a worksheet title, aligning with a lure for user interaction.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://vladjurnalist.ru/archive/file/wukajaduduposig.pdf
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098a9044f679---35142414158.pdf
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/a0c19abcc78b4154102e0455b531d119/51921503529.pdf
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/2913031e774ddb066fda9ef6bb06f8de/wegokizaleno.pdf
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa8c42a968---68828264972.pdf
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/bogeworusujedekekokalup.pdf
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/feda3c7f833a674c0782ecc94066f30f/99663076200.pdf
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608570b2ada5c---92712700116.pdf
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/9363b6e9ecee8ea4821e668f301dba19/27252816765.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/lotqnhb11qrno11f4udj598cg6/jelozoziwaga.pdf
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/qp51numlu5dhij3q3tsgtg34v5/67427801796.pdf
    • https://deltagroup.bg/uploads/file/juzewojazi.pdf
    • http://anhuifan.com/upload_fck/file/2021-4-30/20210430222002971986.pdf
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/5d177d9de6999ad975dd84d0742072a0/11140455128.pdf
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/d5282ea7a7b6d2e7177ec51c587c05b4/48101351160.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=commercially+reasonable+means+or+mechanism+worksheet
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e56d.bin
4af1b4dbc99817ff5fe025b9f64256889d31110097b921a646642185269a5484		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE56D 5248 bytes
font_01_sfnt_off0000f71c.bin
6300e0fb7c55587d79a2fcf5ca7fc3e115ddcf9833004160b77209ae0ba2f505		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF71C 10644 bytes
font_02_sfnt_off00011b61.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B61 4324 bytes

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