Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fffd20cedab5fae…

MALICIOUS

PDF

71.7 KB Created: 2021-06-11 00:35:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: df15bc70ea7e30f117fdfd06b8f89157 SHA-1: 4c21d4a5e1a58c79e5754db7b4b395feb524020f SHA-256: 7fffd20cedab5fae409c1cb9a4b7dbfcbd468da31097e147dfa879ea79c0c0a7
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The presence of multiple external URIs and link farm heuristics strongly suggests a phishing or malware distribution attempt.

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://laborke.ru/uplcv?utm_term=ideas+for+piggy+build+mode PDF link annotation
    • https://shoppingplanet.ro/ckfinder/userfiles/files/87518050791.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2cf8d4f714---famunotolubi.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608118a22bdd5---xesenovuxadotelekalisixun.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/jisomom.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba2436fdb9---dowewivofugumoxulod.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e3dfe354c---relogadikujela.pdfIn PDF document text
    • http://ifa-astrologie.de/userfiles/file/37307555826.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/h9mv3dle82jh3s27ig1luifi5n/vopasugufokukimi.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/pabegig.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a91231d90e---bisulugadunuwelan.pdfIn PDF document text
    • https://davaocarrental.com/images/file/sevevagajufuwuxelonokux.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/b05ab8581fe74375b96b5ee0692ac29c/dezumuzu.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/66557268259.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608638c576887---vejusepa.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e4bd10b56d---kunagubajinifajavamu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn 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_off0000c242.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC242 5540 bytes
SHA-256: 5289ed9b76c1ea4eb9e21abddce5b8376ccd1d678b8b5e186b3e622bafaf4d6e
font_01_sfnt_off0000d50a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD50A 10880 bytes
SHA-256: 26426f12085013e87e926df218c44f323a7307d238ddac21d582ac7776a263f4
font_02_sfnt_off0000f952.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF952 16436 bytes
SHA-256: eb7a30882ee91295b3607ac68c93b76ce798481ee4a0a5bef0981eff7b87673d