Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c100117b3bc5aff…

MALICIOUS

PDF

81.9 KB Created: 2021-08-18 19:24:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7df5ddae6e6dfe3ee7ab01fbfc254609 SHA-1: 32026823494b875ac5007d777c683c688f503023 SHA-256: 9c100117b3bc5aff3cb5f4a89cd052eba3505665f11a94ba368b23f34eb39b96
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with multiple URLs pointing to compromised WordPress sites and other disposable hosting, indicating an attempt to obscure the final destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://www.eau-msu.ru/ckfinder/userfiles/files/58434558343.pdf In PDF document text
    • http://hz-karavany.cz/ckfinder/userfiles/files/subevovebemokebepodinola.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c72c5801556---xesaporalejetinuvaki.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/q30o5mhgpkstpmvbkpiq32ctr8/bidavedevuber.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607333a271873---fugunusedefepibarajez.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16089d59104027---josafubatep.pdfIn PDF document text
    • http://btfa.tw/upload/files/54774755927.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe94b1015b3---89141271043.pdfIn PDF document text
    • http://teraval.cz/res/file/90135454358.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/s6jc7ipikqkoaoedq0kpuf8lq4/63094210645.pdfIn PDF document text
    • https://prestinieurope.ch/userfiles/files/87785791107.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16090d0860b212---94486219472.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/7455fb742385f50e79b40d815e850d4e/91832814889.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160911ccc921b7---lirepirowizugira.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-5-16/20210516163521912585.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/j6n3onsca1l33vf6oj4rtcsu12/26096387482.pdfIn PDF document text
    • http://american-security-inc.com/assets/ckfinder/userfiles/files/72221397974.pdfIn PDF document text
    • http://nhhs78.org/clients/63854/File/sibufudapufizaxegazupaxo.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/3cc7f9461d0b7f6bb2667962bf6bbbeb/famasadodogakobozetopefob.pdfIn PDF document text
    • http://haphadoor.com/upload/files/72179247106.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160decb146a89c---japinewakiporeku.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/negetusifet.pdfIn PDF document text
    • http://anatolianlgs.com/userfiles/file/33757337923.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=navy+reserve+advancement+results+2019PDF 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_off0000da20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA20 16872 bytes
SHA-256: 604e519e7bdeb2d53ea2e9ccdc4ada2d071f597e3b872eaa3c4e901ebd432aa1
font_01_sfnt_off00010678.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10678 11040 bytes
SHA-256: 217c296ffd5ffd334ebfeebb6cb63db20c49fbdc9e402210dbcfe9ae9d2bd49c
font_02_sfnt_off00012058.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12058 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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