Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee9fb9817f62f1f2…

MALICIOUS

PDF

88.3 KB Created: 2021-06-29 04:05:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1373e696b78e8c366d8860cfc7eb29f4 SHA-1: 10fb207e214b0c709cb6c2bbcb06dd14388533a2 SHA-256: ee9fb9817f62f1f20d83108d8ecab48efc83d3a1f6883574bf8a0705b71b30de
172 Risk Score

Malware Insights

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

The file is a PDF containing numerous links to external websites, many of which are hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of a link farm on disposable hosting and the use of WordPress upload directories suggest an attempt to obscure the true origin and purpose of the malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://southtours.com/wp-content/plugins/super-forms/uploads/php/files/95j4uvfij1mj7h9oaa7b7d8ofq/65019243590.pdf
    • http://baraanduliaptti.org/userfiles/file/86648190502.pdf
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/ipq37n6l0f1nbted5ttv1sse65/wolivubatosomepetapob.pdf
    • http://bmcnx.com/userfiles/file/sibeneki.pdf
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160ab8eb908037---pabajisuwumazalewag.pdf
    • http://omonetach.pl/foto/ilustracje/file/85370375596.pdf
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/7e97hbqvac5c56ui72d1eo74nq/tizenujogizugodafirileloj.pdf
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160be3ba7f29ec---rijimamavulilesikovozu.pdf
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/f16a47b8023471966712ff4e8865f49a/87177071477.pdf
    • http://bendhorseride.com/userfiles/file/30664819203.pdf
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/25fd4ed9c742160eea7bfaff6b2235be/57033882579.pdf
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c91455caf3---84995806341.pdf
    • https://avigailpekelman.com/sites/default/files/file/zizesibi.pdf
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd9479fd35---13099965331.pdf
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/e32e9a98f8d663c9998147c57eb55ddf/devosekebi.pdf
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b86c279ccbb---vodonugukumosikotuvan.pdf
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/f53b267979a66f99e80eb55e3951d106/45644106370.pdf
    • https://aradmissions.com/ci/userfiles/files/wifabudopanomizarif.pdf
    • http://2478.ru/admin/ckfinder/userfiles/files/legigadat.pdf
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a305993ccb---93297334818.pdf
    • http://irishheritagesociety.net/clients/7/7f/7f3653e4c5d791bf76f28d2bf9929747/File/tosipelakadopoba.pdf
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160841d4918730---85736353992.pdf
    • https://dodatnagarancija.com/userfiles/file/joretaxeromes.pdf
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afcd0d9d3b2---sedodilodixivepumitazix.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=formal+thank+you+letter
    • 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_off0000f5b9.bin
b23c405653ad9740588d412c9fed09092367793a00a3f1b61f2b8bd7166d2d67
pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B9 10396 bytes
font_01_sfnt_off00010d17.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D17 16792 bytes
font_02_sfnt_off00012529.bin
f0e3ec2ebac9cb3a65f4961d40ef851cf70a726f37b014f7607e4d033000f76a
pdf-font-stream PDF embedded font (sfnt) at offset 0x12529 17280 bytes