Malicious PDF — malware analysis report

Static analysis result for SHA-256 a94c44db189c9c5e…

MALICIOUS

PDF

92.2 KB Created: 2021-07-31 08:50:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 3884a576ecda0abde4e81a61810a1739 SHA-1: e1b9865b2517591b27a7a0ec9d3044e146f1ae10 SHA-256: a94c44db189c9c5ef5ae3de76529728504ce8c09ce090e00b3349cd44dff5922
164 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of a 'download button' heuristic and numerous links to compromised or disposable hosting sites suggests a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains metadata from wkhtmltopdf, suggesting it was generated programmatically, likely to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16093ea4a3e793---43069402433.pdf In PDF document text
    • https://canevastoilestjean.com/upload/editor/file/34207268034.pdfIn PDF document text
    • http://majorpropertygroup.com/userfiles/files/fapoputipagekusuli.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd62628165---79000077832.pdfIn PDF document text
    • http://archiwum.wyryki.eu/admin/ckfinder/userfiles/files/koxegimuvuvabofibikepomad.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/8d72cf6f510e0627c382101fe9e4a42e/31154250171.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d9173d4b259---96498181233.pdfIn PDF document text
    • http://szwygs.com/upload/didadamusupig.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160d6cc7c0c249---53505974520.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/2t17cv5c9lkt5on0uph6sl6817/zetagemexafogesafo.pdfIn PDF document text
    • http://ajisushionline.com/uploads/files/5292764089.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160810ef25e200---3692568821.pdfIn PDF document text
    • https://vicotelecom.vn/static/source/images/file/rovokafeketad.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/b3e2f92585138a5c56e4a49d4519c1ec/96665549607.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1609bbd6eb2dbe---59814099027.pdfIn PDF document text
    • http://designpavelzapletal.cz/files/file/66205712809.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/ui96knc461v3hv29jf46tro0o5/75973495939.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/8b0b4639c37bf56d6a066420956d61c9/lubesetinapa.pdfIn PDF document text
    • http://mywayrtk.info/userfiles/file/30403065950.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/0ed1d1f9cd75a829bd7365bfa927b6a7/kijevuxudufofariruzupafub.pdfIn PDF document text
    • http://popmetre.com/news/files/megil.pdfIn PDF document text
    • http://tuyothuyluc.vn/webroot/img/files/14731563817.pdfIn PDF document text
    • http://tonioloclaudio.it/userfiles/files/36525353739.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=is+resume+builder+really+freePDF 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_off00010539.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10539 16976 bytes
SHA-256: fa341e8cf75a5ad411471f1d7115151c47a871dd0d8e96437fbc56294b35f1f5
font_01_sfnt_off0001317d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1317D 10496 bytes
SHA-256: 78e3a313fca2e8c8f864539c1236db794dea2a4514f1cd3bb0badde403d61974
font_02_sfnt_off00014964.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14964 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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