Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e157ab6144dea4c…

MALICIOUS

PDF

98.9 KB Created: 2021-06-12 12:37:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: ee41403eca4f5ff31db8458e4f3c7843 SHA-1: 0182fac859e97fa4abc62569ea813c96314dd931 SHA-256: 1e157ab6144dea4c3304b1f11588db0ffd528db91ed552d8e05a8bef047848bf
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing campaign. The document body, though heavily obfuscated, appears to contain search-related terms, reinforcing the lure to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://drafthe.ru/uplcv?utm_term=celine+dion+encore+un+soir+songs PDF link annotation
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/e0355771d1ffe72c608bd8450f4c733b/56038300359.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/7511a21f3a5f4c20a71fabea7a45d27e/geranivuwizukifirulelete.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/120c1365189795e631ba4421f7ea0464/vopuladarerinoxowudu.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/pupugebufuvu.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a306ea72631---2054785784.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/b4a513b34b6537f5633e78e8f6198db0/60943217035.pdfIn PDF document text
    • https://www.deuba.info/wp-content/plugins/super-forms/uploads/php/files/da9len6nu1rrokt83f5llsjijc/lifup.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/lokikipezogopesojawo.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb7ad7bcf6---mudaxukoz.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/mguscj28cv02a5c7o338a75si5/ruvidazupolib.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16079cfcbe51d9---kuwikufudufinek.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a27ced40053---vaxobejomofasefugu.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160762a5d9aa5b---24979127955.pdfIn PDF document text
    • http://caratow.eu/userfiles/file/judutalajuxifomixeb.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000138f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138F8 3120 bytes
SHA-256: a6f841a436d9058f7afd927fb013522bdf00d3b8caba92eac94af016f564a6a1
font_01_sfnt_off00014434.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14434 4800 bytes
SHA-256: af944963d8a64dfe5565e531480248e570895c9b39ce2ec8c46616379428bae0
font_02_sfnt_off00015491.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15491 13792 bytes
SHA-256: a1444c6431d4efe2564c933ae7b7239034a1f0741f067c956daedea9dd8c6894