Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4396e4588cbfaae…

MALICIOUS

PDF

100.7 KB Created: 2021-06-23 16:47:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 842d3870dccaec43162e94cecc4758db SHA-1: 7d8d210fdf52fbe8c1703cb0eb30e0cc97f60d70 SHA-256: e4396e4588cbfaae6559cafff6d76e07bd8481d4cfbbdf27cf0ce1236a6e6a3c
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/bvs37npt5v5mc3qgdqh66l3o67/nevujozazeneret.pdf In PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/1a9d705d982ca24ddd7c23bd6609a6ad/82639918150.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/rafapafaxekuxazeru.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/77517707790.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a6b311e5454---30999460810.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file/%5C/52292941148.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/kunojinim.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/55aa4c5db34c9322ca3fd0b8dee5bee4/41114235117.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b19aedd7fcd---nufivokodumetixigoji.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/6abfa67b12fa83a6a132154fc954551f/1110601377.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a7dd0308e1a---43068849568.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071f2de4e001---zujabu.pdfIn PDF document text
    • http://waypl.pl/upload/File/kogezizovikiporowasolu.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/v169ghk4r3rrs4n5km772pkn76/fepijutukesu.pdfIn PDF document text
    • https://condominiobrisasdelnorte.com/userfiles/file/tulagemil.pdfIn PDF document text
    • http://sgpeo.pl/users//file/tesinixukati.pdfIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=varahi+malai+pdf+tamilPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00011e2a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11E2A 31084 bytes
SHA-256: 9f25669073e2f61e2ca7ce7f1bb0f49fc0f5ead8564b5e04c4ff41cfb896b1e3
font_00_sfnt_off00010ee2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EE2 4520 bytes
SHA-256: cb770a4dbef3a4992c08355a6e890e20b36293fe05c648db63e4bce564f92419
font_02_sfnt_off000159a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159A7 8064 bytes
SHA-256: da1f7567d5a6e8c2fecf1f3a88087c9f72b5c7b25a3ab1b8b4c0acdb1a75b9a6
font_03_sfnt_off00017512.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17512 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c