Malicious PDF — malware analysis report

Static analysis result for SHA-256 36da07dc6e199620…

MALICIOUS

PDF

85.6 KB Created: 2021-09-07 05:19:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 53c76daf1ec8fc2c9eaa8980351a401a SHA-1: d1d62119a419519b20dbe3b3b8c964d939e33fb5 SHA-256: 36da07dc6e19962099d903dd57841cfb47aada680b8d2826eb56408b87feeb27
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links pointing to potentially compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of embedded URLs and link farms strongly indicates a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://drafthe.ru/uplcv?utm_term=explanatory+paragraph+examples+pdf
    • https://fwullong.com/upfiles/editor/files/6990754867.pdf
    • http://cityclick.it/userfiles/files/polobigux.pdf
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/f93d4bc8e6f9b5244d819a273a2f209f/supugagupituniw.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160841ec5c67a5---93446300208.pdf
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/1j075b0lsu9bdmusuo1dgnuj43/juvux.pdf
    • http://constantemail.com/userfiles/file/1625436355dosirinemexidosat.pdf
    • https://karatenarrewarren.com.au/ckfinder/userfiles/files/derafu.pdf
    • http://tatishev.ru/admin/ckfinder/userfiles/files/nenovi.pdf
    • http://xboxheerlen.nl/userfiles/file/pejanipuneriromabav.pdf
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdbc12af6ba---61929017852.pdf
    • https://alutat.com/data/file/jurajemabavo.pdf
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/c6ed4f701b7574e5584ade7ec26a9aaa/71621331729.pdf
    • https://bushregenerators.com/userfiles/files/68255572416.pdf
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/3ee3612c50d16abb752e6dc518f7b828/73383788016.pdf
    • https://eastmanllc.net/ckfinder/userfiles/files/zosemuropuzamovoxat.pdf
    • http://iworking.vn/uploads/files/kevixosadojuvi.pdf
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/ec4e365cb1822523818be477d1e62615/lelitemobusidufekareto.pdf
    • https://soosekszer.hu/upload/files/turuwipajijajutino.pdf
    • http://vienkiemis.lt/app/webroot/uploads/userfiles/files/63717870224.pdf
    • http://medi-sen.com/files/files/nuwukudupe.pdf
    • http://xn--j1aii.su/userfiles/file/77848952214.pdf
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/nibuwajitegapowonatam.pdf
    • http://miet-boot.ch/images/uploadedimages/file/95106402006.pdf
    • https://abugfreemind.com/userfiles/file/20612196856.pdf
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/70d1539fc6af0ec8131185f8cca57e9d/47807972.pdf
    • https://et-auditing.com/userfiles/files/gagol.pdf
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608538787273c---23230554454.pdf
    • 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_off0000ea98.bin
d6a50d670f51bbb23fdba81ce64d73794c96ac2d33b69a6ed1f554405ba3be58
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA98 17616 bytes
font_01_sfnt_off000116cb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x116CB 16792 bytes
font_02_sfnt_off00012ee2.bin
676b017a9411f6a4e44739c1478e31320367cabc7bfecf5668c4e8a9f34df7cf
pdf-font-stream PDF embedded font (sfnt) at offset 0x12EE2 11052 bytes