Malicious PDF — malware analysis report

Static analysis result for SHA-256 a02cb1b8e3251928…

MALICIOUS

PDF

82.3 KB Created: 2021-09-02 09:04:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6fada7912533432487722285deb907e6 SHA-1: aebf2eb3e724f717a254394ea67e3cea5bcb80f4 SHA-256: a02cb1b8e3251928fb2c3924221b1432716977e75154750659581a7d3b28ec89
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a non-clustered link farm on disposable hosting. No scripts were extracted, and the document body was unreadable, but the presence of multiple URLs and the heuristics strongly suggest a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/2c4a39b6f371150202a06cd344ce65da/rutevexebada.pdf In PDF document text
    • http://cpils.com/userfiles/file/depixevozafi.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/185e24e789a20db9ff21345a8e33f725/kujoretixasomawewiluporog.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/10103091156.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609aadbc89feb---pejomowudipikomosukinor.pdfIn PDF document text
    • http://szpital-sulecin.pl/images/fckfiles/file/18054840792.pdfIn PDF document text
    • http://jinwoosmc.com/userfiles/file/gaxurupagifigemulik.pdfIn PDF document text
    • https://aslplastic.com/ckfinder/userfiles/files/90946797172.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/bdb2f2ff23ed1bd54fe2b0a5aea8664a/setufikeviwazip.pdfIn PDF document text
    • http://conomiya.com/images/uploadedimages/file/wanumafilutazuso.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b60961b63e9---77532209913.pdfIn PDF document text
    • http://ambulatorioveterinariorigolon.eu/userfiles/files/rebojivezuno.pdfIn PDF document text
    • https://rosycaffe.com/file/19439487142.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16103b37d968cf---nepuvajoz.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/e7b1b517f5e80cb12829a87eb96b2d73/motufibumuzigenapigelape.pdfIn PDF document text
    • http://clubesquilacoma.com/uploads/files/zekibemudavojisugisujako.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/vixozajajaw.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/32479683945.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/9532bc41d6703247392109105bf3b5ca/13685037113.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c587059571b---45737034123.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/29775428450.pdfIn PDF document text
    • http://jncs.kr/page_data/file/20210515152157.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/3dcd775c3cd4f56146b7c59b10bba7c0/lokizixiwi.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16071b460bca13---gofisizelabotomijenolibol.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0005f20f0a---22474805276.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=i+am+going+to+vs+willPDF 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_off0000dc5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC5C 10324 bytes
SHA-256: 1b76a2a0a1ead15ed57995994e5f06ed7f94095c5d5c308d263b49745e371283
font_01_sfnt_off0000f3a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010bb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB9 18536 bytes
SHA-256: c1393c4d628e13608612c32b05452d8efeb01fcd734fcdf91e724525c4eab5c8

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