Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6b0e630ef222727…

MALICIOUS

PDF

66.2 KB Created: 2021-05-15 07:16:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: cdc456c42b3bcd48a2af7e2803756bdb SHA-1: f4c5d68c04ef77141cc93c2fa5a2ba48bbdd3c4a SHA-256: f6b0e630ef222727ec776c4d02969fbec5ec3aaf576d1539b3f4d9ec058ce8ac
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate maliciousness, with the URLs likely serving as a link farm to distribute phishing content or further malware. The document body is heavily obfuscated and appears to be junk data, offering no direct clues to the intent beyond the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/b48f773ab42474255e67ed14a79140ee/jigudevagisefirad.pdf In PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160998e7ab7a21---34934785413.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/56d04d27ed7b061656860b447fc2d2f1/lekotefebovowefuwe.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/3kac85k7ns635trfh1etrn39td/fejirixoruf.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/uutn5lopq85ak2ed568ngeu8a0/68572947794.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16083fb29bc911---78598499827.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/c619534c749491e521fb3c4ff8621393/toxifi.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606efcd6bcad6---44279516060.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/jexadejuzezobaz.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/zomusujawopurimubeludule.pdfIn PDF document text
    • http://pogservice.ru/userfiles/file/25672673446.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/5411300666e6b21193ad581c39ea22ab/48317637766.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/3e044c949aa0c30f8d5c4ab693db88bc/90865085874.pdfIn PDF document text
    • https://aravlicraft.com/cmsCart//upload/file/morer.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=don%2527+t+starve+bee+box+guidePDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c94a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC94A 5260 bytes
SHA-256: 08d87e35a25c204018c28aad52113ac5918db0a9efcaee60dc8a78fc4d20e20c
font_01_sfnt_off0000db4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB4A 9800 bytes
SHA-256: 845e99ccde4f202ed4b36e23b02257221dde68f28f1d02cd6dd4c8addf9c9f97