Malicious PDF — malware analysis report

Static analysis result for SHA-256 43ccf2240d1862e2…

MALICIOUS

PDF

85.2 KB Created: 2021-06-28 14:49:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bc398bd4c49d1fb935be99b32ca969e5 SHA-1: a16a7d149f657fface71d6045e8daf8993e873c6 SHA-256: 43ccf2240d1862e21cd3fab419aa45ce70b98cdfee00c376d85f3a81b9245ec2
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple 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. No scripts were extracted, but the structure and URL findings point to a malicious link aggregation strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/ca1md3o4n1lb73pgkgohgjcdda/katesusu.pdf
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/31518a6432029422ae07d8f3faebf075/49986903442.pdf
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/ade6264eed66d6b3b62464233921bb16/36165592942.pdf
    • http://szwygs.com/upload/66453282242.pdf
    • http://www.deopendeur.org/imgUser/file/17901362651.pdf
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/8f80319042fb7bf7a60c49ef53ffc4b3/xatasupanizemifujo.pdf
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/16085adac5ab9d---nepiwebififorogumote.pdf
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/4d0aaccf4eab9254e21676cd29e2a3e8/20867168544.pdf
    • https://sportnazona.bg/f/uploads/files/romubilanemakim.pdf
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e010f128ce---25462847081.pdf
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/cffb0936f596608131d139107a19e4de/rinomij.pdf
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c48396e8d82---44337025814.pdf
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/ce26ab6726e8077cc92e23f7d7d9f455/pubaravurujefawewa.pdf
    • https://wecareu.net/ckfinder/userfiles/files/38722398643.pdf
    • http://hondasushi.com/uploads/files/47907535771.pdf
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/g9ub38ah3ms21juvm6q3caeis7/36355572509.pdf
    • http://martom24.pl/martom/userfiles/file/52072538003.pdf
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a74199e2a5d---femuduvidimisozamuxizi.pdf
    • https://nepalaviationmuseum.com/userfiles/files/xegolorujet.pdf
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/2eupq4c2mm0a56e5gojece310d/85087649781.pdf
    • https://itchanoi.vn/uploads/news_file/vukaj.pdf
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7ff1ab22a---27281635082.pdf
    • https://argekaucuk.com/nbg/upload/files/xijobaxilelumabali.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/66c08a6b6a2ccd34fde970b264b3355d/favimubo.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=96+movie+songs+download
    • 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_off0000ea77.bin
55a63486b7b62f893eb81a711480f27ef1c6db79f3c879ae99c38ed21b94f20f
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA77 16972 bytes
font_01_sfnt_off000116f7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x116F7 16792 bytes
font_02_sfnt_off00012f0e.bin
a7d1706f3e630e776f46ae237bdc534b116b771294d4c199445bb03f3b03c30c
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F0E 10784 bytes