Malicious PDF — malware analysis report

Static analysis result for SHA-256 af56cb5659726c7c…

MALICIOUS

PDF

70.5 KB Created: 2021-10-02 09:10:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e2dc28b947ec29f0419de34b7b2e70f6 SHA-1: f460853999e6dc54e1e4d458e29fb737bcd97d31 SHA-256: af56cb5659726c7c906d00eee1994a243871faec35468be326eaae9b25282dce
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/4q1meouof9e1k60g23g99u6se7/rogagimopemuvojelasi.pdf In PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/0filubj0mmomki8um7h1v9s5gn/91974612783.pdfIn PDF document text
    • https://crc.creativechange.net/ckfinder/userfiles/files/41240471045.pdfIn PDF document text
    • https://chung-pei.com/userfiles/file/84551301405.pdfIn PDF document text
    • http://svazekobciorlice.cz/userfiles/file/nusojoluvovuvewudasi.pdfIn PDF document text
    • http://moestuinwebshop.nl/userfiles/file/62948388276.pdfIn PDF document text
    • http://studiorumeo.it/userfiles/files/wulofato.pdfIn PDF document text
    • http://kfoodntea.com/dataroom/file/57939205665.pdfIn PDF document text
    • https://27061010.com/uploads/files/202109260116056490.pdfIn PDF document text
    • http://wannawwannie.pl/userfiles/file/kamimuzokozefusopoz.pdfIn PDF document text
    • http://pro-group.ru/userfiles/file/17713742380.pdfIn PDF document text
    • http://mxag.com/upload/browse/file/82908234371.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b33ca853ee---13118227025.pdfIn PDF document text
    • http://standdominica.org/files/files/99192434810.pdfIn PDF document text
    • https://marlschuz.com/userfiles/files/kubowumogabusizale.pdfIn PDF document text
    • http://vinhthuan.vn/upload/files/bidirup.pdfIn PDF document text
    • https://qatarsecurityservices.com/public_html/userfiles/file/75115134660.pdfIn PDF document text
    • http://laihoawedding.com/app/webroot/upload/files/23281892788.pdfIn PDF document text
    • http://hyosangjo.com/userfiles/file/20210924120447.pdfIn PDF document text
    • http://neoneophytou.com/ckfinder/userfiles/files/45832698994.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1614f8f0a5e201---topixepakijoduf.pdfIn PDF document text
    • http://pelejas.com/IMAGENS/CKFINDER/files/17598792683.pdfIn PDF document text
    • https://www.q-jin.ne.jp/ckfinder/userfiles/files/solawojilixenujogu.pdfIn PDF document text
    • http://didaconcept.com/admin/fckeditor/file/74897729986.pdfIn PDF document text
    • https://virtualpulse.eu/UserFiles/file/fakekugafedulogebesate.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=top+three+oil+producing+countriesPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b26a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB26A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA7C 16400 bytes
SHA-256: 9a903bcd15975c42dd2ff24c2b499c3204943fa9a41679bb61bb311c73aa4c60
font_02_sfnt_off0000f41a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF41A 10692 bytes
SHA-256: d796722ad15f59f52b4d9facac8d84a7af77fcbe4d34a5be1dac678073e3e635