Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e1faf38a3ad1503…

MALICIOUS

PDF

84.6 KB Created: 2021-09-10 14:50:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: e4da0420d3614c855e1011abc93d813e SHA-1: 01bacad7af0a68ace56b70a62d5e9c4d880ea801 SHA-256: 7e1faf38a3ad15033b763fde796cfdf3fcc6440b60abd55b287da8ddeea871e9
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Static analysis revealed it functions as a link farm, with numerous embedded URLs pointing to various websites. Some of these URLs lead to compromised CMS uploads or disposable hosting, indicating a likely attempt to lure users to malicious sites for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://retailcop.ca/files/kivurumarus.pdf In PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/57558462cdcb446485f85cb3d89eb6e0/98879698840.pdfIn PDF document text
    • https://buzascsaba.hu/userFiles/file/muragakobimorozupotozov.pdfIn PDF document text
    • https://henseltech.cz/userfiles/file/65300184762.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/8276245c16cddf7dd7d7f56ec3499b86/pekekuwojibab.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/72218639953.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/b833752650b9ac3c3378f8f22be5f8bc/geximidebozowisulazonese.pdfIn PDF document text
    • https://kuepancong.com/contents/files/83976186742.pdfIn PDF document text
    • https://www.hkha.org/ckfinder/userfiles/files/vegadujijisalol.pdfIn PDF document text
    • http://chulatutoracademy.com/chulatutor/ckfinder/userfiles/files/35458034672.pdfIn PDF document text
    • http://lokalsport.no/userfiles/file/63494673921.pdfIn PDF document text
    • https://chorland-dining.com/webroot/editor-uploads/files/boguke.pdfIn PDF document text
    • http://philipp-haberland.de/images/upload/file/83622229164.pdfIn PDF document text
    • http://pijntherapie.be/uploads/files/26809353797.pdfIn PDF document text
    • http://taigesw.com/upload/files/67236980937.pdfIn PDF document text
    • http://jplus-ag.com/upload/files/BodyFile__61394FF818AD7.pdfIn PDF document text
    • http://www.sintsprev-ms.org.br/ckfinder/userfiles/files/tufuvopokifena.pdfIn PDF document text
    • http://naturpix.ch/cmsimages/file/45620128994.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/0umg4au0bcu3cpgdp5tg79ccea/68419252725.pdfIn PDF document text
    • http://candemdientu.com/Images_upload/files/tojawopuvepuwakasivunewu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+do+live+photos+on+lock+screenPDF link annotation
    • https://mediaget.com/userfiles/files/gelawabamagakasixonoze.pdfIn 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://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_off0000e2e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E0 19024 bytes
SHA-256: aa3d908406d9993bc0ba08409899b4083f7531b853254a95c7fed800ab2b56be
font_01_sfnt_off00011407.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11407 10684 bytes
SHA-256: 1ebf19930682c519ef27f55c6016522661ee3372a6d9d09af4d5cbf8c10f1935
font_02_sfnt_off00012c75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1