Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bc79500041980b8…

MALICIOUS

PDF

85.0 KB Created: 2021-09-17 12:28:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 9988b3956077b1d7fbe9834afb6b55f1 SHA-1: 1666044938ff7b5506e76bfa5b29c188da6b3133 SHA-256: 0bc79500041980b82dd76d76a6ba4fe099cd78b53d861dbf016f0657319a476a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by a ML classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic further support the conclusion that this document is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/a9b2cab610e0a55aea92ed983d538c54/rozisufeve.pdf In PDF document text
    • https://familienbilstrup.dk/userfiles/file/fowezojavemir.pdfIn PDF document text
    • http://bassbasement.org/userfiles/file/51544143306.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/4bccede8030397cff0d1dd22383ecb89/jubepupaj.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/6df15494ca821628b3888224380dee21/7544240893.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/potunusukugurizoziru.pdfIn PDF document text
    • http://immobilieninvestors.net/userfiles/file/muwijimurog.pdfIn PDF document text
    • http://rc-modeller.se/images/file///simuxodurobokitavu.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/62a04a23a282bc97f53ed84fc683e2aa/84202289641.pdfIn PDF document text
    • http://ambulatorioveterinarioilprato.eu/userfiles/files/laluxagedeti.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/ap31200n1q933sditua03ok7br/fukoduse.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/156d39d0aee0025acb13a403dc323e66/94070429380.pdfIn PDF document text
    • https://virker-ikke.dk/files/tafase.pdfIn PDF document text
    • https://3eyamaichi.com/upload/ckfinder_temp/files/20210912192320.pdfIn PDF document text
    • http://dienlanhtruongson.com/upload/files/13653000283.pdfIn PDF document text
    • https://danielfelber.ch/userfiles/file/51497397931.pdfIn PDF document text
    • http://methese.com/upload/files/juridovomasisexit.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/36927225465.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/161346f6a4f340---genapanizimiwawipedotoziz.pdfIn PDF document text
    • https://kaptenhoki.net/contents/files/mafimi.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161312b78bb091---42393614012.pdfIn PDF document text
    • https://mmrh.myagenda.cz/pictures/editor/files/jajolese.pdfIn PDF document text
    • https://nstyapi.com/resimler/files/gebasasamipimudukegowo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=oet+speaking+test+sample+pdfPDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e76f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE76F 18000 bytes
SHA-256: 4e68539c27086e96eeceef520c14182ab043c082760719c5910f1eb0a435b585
font_01_sfnt_off00011585.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11585 10740 bytes
SHA-256: 30f001f0e27d244b83f2bda213f2df1ce7131f45b67a36e1a6aa3642b76e5cdc
font_02_sfnt_off00012e14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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