Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e0c1a00f535f373…

MALICIOUS

PDF

85.7 KB Created: 2021-07-14 07:09:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 719bdb6d03711daeccccaf5d6e911aef SHA-1: 97715ff87108a15baa5746391d525b71eea82c55 SHA-256: 5e0c1a00f535f37347fbce68daa55d06f572c1ebb7104626ef51dbd9c95ed7b6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to websites that appear to be compromised CMS uploads, suggesting a phishing or malware distribution scheme. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were extracted, the structure and URL patterns are consistent with a link farm designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://7166867.ru/ckfinder/userfiles/files/83482596277.pdf In PDF document text
    • http://amandamaitland.com/images/file/makurizasogomomotibiriva.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160724909eba59---54515582615.pdfIn PDF document text
    • http://diplomat2014.ru/ckfinder/userfiles/files/94414892587.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/8e9d72e42912a77709c740ce1b353087/debaza.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae3aa339a26---25751282411.pdfIn PDF document text
    • http://lideparts.com/userfiles/file/1620781745.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/66461005055.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/6db0694984ab304a1d5e11147e603a50/28934238546.pdfIn PDF document text
    • http://e-photo.lv/ckfinder/userfiles/files/26903470264.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc33aded86---zemomopaxemuze.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/9a3dc7d49a6b81ef452383fa1e12c728/divotepasobu.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/k12h0vppvr4tj0i9aq884tm4qq/tuganurogi.pdfIn PDF document text
    • https://psychotherapie-coeppicus.ch/userfiles/files/bigukiniwelevifarajujama.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b6333d0a5bf---tozil.pdfIn PDF document text
    • http://scheidenschiedam.nl/uploads//file/6460279899.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/fb2b4fkfbi06l809deuo08ef87/31882970669.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/39pqthir1pkstne6tq2rkvv1je/jelili.pdfIn PDF document text
    • https://wecareprogram.org/images/file/50978461927.pdfIn PDF document text
    • http://orem.mn/uploads/files/faxinopojipuwofojufije.pdfIn PDF document text
    • http://isagenixmakessense.com/ckfinder/userfiles/files/86080351194.pdfIn PDF document text
    • http://ebanksunited.com/clients/7/7d/7da19d52c1086e69e61582739ce98a0f/File/fapafilasalimonefilemexel.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a577507b01---dowetomafa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=pulling+a+muscle+in+your+shoulderPDF 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_off0000ede9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010600.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10600 10936 bytes
SHA-256: 3e1404f332adfa33d1a39d467ce2b865eecc4930a2e565a29174d657ca0d787d
font_02_sfnt_off00011eef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EEF 16796 bytes
SHA-256: f2e54a183b52d41df586ef74e85dc016388b027156681db46b1e1d829476222f

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