Malicious PDF — malware analysis report

Static analysis result for SHA-256 abbbd71aa394d0f4…

MALICIOUS

PDF

82.3 KB Created: 2021-10-14 05:14:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: ba10395f9e133eac0f6c7f38a0b79f6a SHA-1: d460f5b9429aaea3112b292ace880b7d45da3fdf SHA-256: abbbd71aa394d0f430e6cfd84694b4ab1867a6a178e621da17bd7f7c78b4042b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to disposable hosting or compromised WordPress upload directories, indicating a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host malicious content or redirect to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://philabc.ru/uplcv?utm_term=welsh+cawl+slow+cooker PDF link annotation
    • http://ewhamd.net/upFiles/ckeditor/files/bokasufamovenutukit.pdfIn PDF document text
    • http://haphadoor.com/upload/files/44156399748.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/16325118622259.pdfIn PDF document text
    • http://areaengineeringsrl.eu/userfiles/files/57819813420.pdfIn PDF document text
    • https://www.aaptuk.org/ckfinder/userfiles/files/85467932862.pdfIn PDF document text
    • http://com123.vn/uploads/file/tanewugabenazu.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/49023540517.pdfIn PDF document text
    • http://viviapalermo.com/userfiles/files/xumepugime.pdfIn PDF document text
    • https://dptech.vn/uploads/files/30221073340.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16161ea944a05c---bikimuve.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1615db4572b8d4---zomubolezaforotutapaga.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f80965430c---70331534747.pdfIn PDF document text
    • http://gaytonfa.com/upload/files/2452166739.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/tcjlv0399lggjv1tlub9ciupat/1013183108.pdfIn PDF document text
    • http://czernavendeghaz.hu/admin1/file/16883097770.pdfIn PDF document text
    • https://tectrongim.com/uploads/files/wenoxozepu.pdfIn PDF document text
    • https://laptopserwis.com/app/webroot/media/files/zasupopixa.pdfIn PDF document text
    • https://sharmtocairo.com/userfiles/files/xufixapazafowugatasefala.pdfIn PDF document text
    • http://kunjipsc.com/uploads/files/50952296658.pdfIn PDF document text
    • http://sungwoo-n.com/userfiles/file/84378083145.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/11799523203.pdfIn PDF document text
    • 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_off0000dec5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6DC 10204 bytes
SHA-256: 48144da8a67d035857fc1fdf221109e99fc8f33cee2fe2fa83b6849b3cfcf0b5
font_02_sfnt_off00010df5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF5 18020 bytes
SHA-256: a358bfb3f15603d323b7e39559307f5d137047915b88c1c2a2e0850bf14919f1