Malicious PDF — malware analysis report

Static analysis result for SHA-256 32635b944000fe15…

MALICIOUS

PDF

74.5 KB Created: 2021-05-07 11:04:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: bf5213cac871fa214c2fad44bfb26ee5 SHA-1: 3c67bbe6d9ebb3d6398bd352b6d42a50856e1b1b SHA-256: 32635b944000fe157f3e6fbe1b356f5fb667f71d35b82bd2bb2bf19c739eed6d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The heuristics indicate the PDF acts as a link farm, pointing to compromised WordPress upload storage and disposable hosting, suggesting an attempt to distribute malware or conduct phishing. The presence of embedded URLs and the nature of the heuristics strongly suggest this file is part of a malicious campaign, likely delivered via spearphishing.

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://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/334414cd1956f448bf341686e390a835/39628563929.pdf In PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/bf44506e0a43ceb0d93d12d55410a60c/10144157954.pdfIn PDF document text
    • http://yuha.be/_files/file/ripelaxenix.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607198a3b9c33---nidiwogelagudaki.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609079eecf67e---verik.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607affa328745---genuvuloxovejabupoze.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/6778743734.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/icehfd34jhj0578nb8bb9qenev/xakolobiru.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/8f3a012d79bd60c4fd4cb56f85ffcfba/fukatofevig.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/o1u9ivduo9lgtpflpk54c1jr86/xupubekidukutonozojupisa.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/f3631100f03e5b678214b1259ee0448b/detabepopugivux.pdfIn PDF document text
    • https://banktapeunadana.com/tapeunadana/bank2/admin/userfiles/file/xopipizeger.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/2562c2b38185306c488312b0507c9f23/fipinokebafafok.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0c4094f38---38031083276.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d57d58b369---xorevikome.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/FevRqgeaUVY/uplcv?utm_term=bully+apk+android+2019PDF 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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0001051c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1051C 16272 bytes
SHA-256: 07cef63e8e246b5d02193ddf1430a40eba0e36d35196817731f8529acf823777
font_00_sfnt_off0000c92e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC92E 5472 bytes
SHA-256: ab2986f3673e912cde2366fb6e4378516445740a252fadc1fe106ce1d22b3b70
font_01_sfnt_off0000dbea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBEA 13056 bytes
SHA-256: 3f698bd3cf12677fbc765c47e5d72b483e5e614140c6a8c76e36a311c1fc85aa