Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9b7b86af1f074ad…

MALICIOUS

PDF

85.2 KB Created: 2021-07-01 16:25:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 77dd744b31d8ec7f64466e0d18144a8e SHA-1: c2316e730a38a2198c29d8e04b3f741de6d75f39 SHA-256: b9b7b86af1f074ad0dc3082e5bd2b93014c8fe2b27a65c83ed69bdb38b877997
156 Risk Score

Malware Insights

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

The PDF file contains a link farm directing users to multiple external websites, with several links pointing to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The presence of numerous links on potentially compromised or disposable hosting further supports this assessment.

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://agronlogistics.com/userfiles/files/xonitekak.pdf
    • http://smcertificationservices.com/userfiles/files/62359066205.pdf
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a65c0e65553---fuzedugevufasuvup.pdf
    • http://md-servicios.com/userfiles/file/25787705061.pdf
    • http://www.allatpatikapecs.hu/images/file/risifam.pdf
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607964aee1010---59163447138.pdf
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082a22203f40---zapixugukusizabam.pdf
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087fa8009efd---vugokiladeranufas.pdf
    • http://atomleasing.ru/media/File/witilemakaxibez.pdf
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/51e65f880e995c3f627a0e7718119044/63462125804.pdf
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd928cd930---vefilimugagef.pdf
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/8ac2f6554f6eb27482d745fe4e11ce5f/lazisuxubekofifodile.pdf
    • http://vangphugia.com/userfiles/file/87538826936.pdf
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/2e9e0dfa821e195b942bdf06ac67bc73/65693151458.pdf
    • http://synerfreight.com/syner_upload/images/files/47472311259.pdf
    • http://nebo52.ru/uploads/files/33452145354.pdf
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/5fd836ccde92359e98a26bc10222d47e/maxeti.pdf
    • http://creativeindustries.ru/uploads/userfiles/file/34740479044.pdf
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088740a6e1a4---vasinorejukazufedarajukad.pdf
    • http://norilskgu.ru/userfiles/file/momilike.pdf
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608858c5e70c1---47090671895.pdf
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acd377e64e4---97356295941.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a0592a82e7a---9488426000.pdf
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a6213542301---17657072317.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+earn+crypto+coins
    • 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_off0000e9a1.bin
5c6818edd1783c822ee71386da3719ae8154b27e94022e1d9b3c5b1eb42c0ce8
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A1 10512 bytes
font_01_sfnt_off000101b9.bin
e320db8422ff0bbc9f38469083ff8391c9b322138d6a65ed395b3bdacd982f31
pdf-font-stream PDF embedded font (sfnt) at offset 0x101B9 17420 bytes
font_02_sfnt_off00012e36.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E36 16792 bytes