Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ac7805977a1a20c…

MALICIOUS

PDF

96.0 KB Created: 2021-06-28 20:56:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bc024bfee4b88b91e560b865cc2d5b2e SHA-1: aa094b8487d18c53b2f55421296e69aa7dbca43f SHA-256: 3ac7805977a1a20cc6a8b963cf38103a18a98adeae9d0423423dd49e26770b37
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites used for hosting files. Heuristics indicate this is a link farm on disposable hosting, likely intended to manipulate search engine results or direct users to malicious content. ClamAV and ML classifiers confirm its malicious nature, flagging it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 6

  • 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.
  • 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://www.awakohchang.com/image/upload/File/0132928817.pdf
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/6f7566ea0250684446cc8f09aa3d64e7/jeboregamotukijakudubak.pdf
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16094cc699c751---9271394657.pdf
    • http://fernandopelosini.it/userfiles/files/polok.pdf
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a241621389---rodeginewibufotuvebojinob.pdf
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9a76ee2d42---2801562801.pdf
    • https://rajatotogroup1.com/contents//files/litajevegepadefibafam.pdf
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077213139298---1600388205.pdf
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a253cb5d3f9---24528431128.pdf
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160800ebb26667---86945163742.pdf
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608685b4af660---40000580472.pdf
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b8ddc7cbb42be9ecca034d14bf2c17bd/biguve.pdf
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/i0b0oea2528633flnoi1r4jths/pozututera.pdf
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/3ec6cppofv75k1ovd6bagmpn95/70954667324.pdf
    • http://fontanarosaserigrafia.it/userfiles/file/sofuw.pdf
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3096770e2---japidalu.pdf
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd96f10f403---dimorapolede.pdf
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608238d2cb56c---68724055417.pdf
    • https://bilalyapidekorasyon.com/userfiles/file/vavededuzitelewamuva.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=turn+based+mmorpg+android
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fbbb.bin
122a67b016a9d473a9569d05ae8e42fd58da0e7498c0828a3be5cc1d40565011
pdf-font-stream PDF embedded font (sfnt) at offset 0xFBBB 17924 bytes
font_01_sfnt_off00012b0d.bin
97e3f73a58ccdd4784c9ae1678d9f90717e6b6d0c87c36bf93adb8865ef65ebd
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B0D 16192 bytes
font_02_sfnt_off0001409a.bin
195adc48257ea05f7a7009ede3aac3e512fc4a645d68ef24533b26d44ddb979c
pdf-font-stream PDF embedded font (sfnt) at offset 0x1409A 10796 bytes
font_03_sfnt_off000158fb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x158FB 16792 bytes