Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa6f3741851a2f69…

MALICIOUS

PDF

159.3 KB Created: 2021-06-14 08:07:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 76d9587862e556e93bd5b5d5680efd1f SHA-1: cb7f57423334237de0e2e0b586d6dc7c00d11cbb SHA-256: fa6f3741851a2f6912067ebbbd5ec45c1394a593100ece5bbdaa95f02979dba1
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains references to 'Attack on Titan' and 'wkhtmltopdf', indicating a lure to disguise malicious links. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://garglob.ru/uplcv?utm_term=attack+on+titan+s1+eng+dub PDF link annotation
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1609b97c7a8ea4---gojapafave.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096e67bc7233---99306571514.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c5617b27e80---91064367829.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160721e89d8b36---lolalixuwewomel.pdfIn PDF document text
    • http://groupkaishan.com/d/files/53258964187.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/vigabuzulirazurezorelis.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/qmccnj91406o7i6f9ga11gvq22/kisasopisox.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16073b5cc46161---lapome.pdfIn PDF document text
    • http://hobbstownis100.com/clients/6/66/66141d04a4341350d76ae3a38785cb5a/File/7835154955.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b108c47a078---dajepasilunovuvaf.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/bef81e6c623eaed42d6cc020daaa65d8/tumepus.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609506466cf23---82369331764.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16098c546394d8---valol.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/9uu9korrvvurr97rsajir8lkd5/83507479699.pdfIn PDF document text
    • http://apvn.info/userfiles/file/31916934136.pdfIn PDF document text
    • http://poslovniimenik.net/firme_data/files/padadeli.pdfIn PDF document text
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16080202430996---13806742001.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/87dd5b80dcaff55cf39d84e2ea487186/kiviravusezarepugexekulev.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017c72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17C72 50132 bytes
SHA-256: b58d6eafe0718b137b87a5bc4c46a366672e63388c1243744a35b24fb7079686
font_01_sfnt_off000216a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x216A4 5224 bytes
SHA-256: 3172a1f9f3e92fa9b87eadc855c29675574b0a03c715b8d2eca7db036403b994
font_02_sfnt_off00022885.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22885 13632 bytes
SHA-256: 5ace3c491d6897773d33e6a5c5cc91baaa0acc6ca2a2f09cea531b580ea9cf5b
font_03_sfnt_off00025402.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25402 18476 bytes
SHA-256: 230938fc8a2b0a5b308570b90c35a378c80ac20b17ab9702213baaa516b0747d

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