Malicious PDF — malware analysis report

Static analysis result for SHA-256 b18c071710a738b1…

MALICIOUS

PDF

83.1 KB Created: 2021-09-04 16:13:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 42d2fa8e95e01356e89b650e84966d1c SHA-1: e2e7c7dcfe03a51aa8649e485a50e0750ab413e8 SHA-256: b18c071710a738b14ab02e43b31413ad6fd97cac15d68a642110394756d83719
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating it functions as a link farm to distribute further malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the embedded URLs and heuristic firings are sufficient to classify this as a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a99db04d54---kozupasivadefiwexudomud.pdf In PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607624606aca1---23374534758.pdfIn PDF document text
    • https://dpengineers.info/admin/userfiles/file/40597677066.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/gbgqaukf999rf3j9no0qfhq5rf/17621700806.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/e5f956ac149ce84e6da0e5b975b95087/tepokafapanalidepevize.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/87788735458.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/969a7f82535eaaa7ad19da0d0db31539/31099548702.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/fbc1f947eed01ca67667568419065470/67973995039.pdfIn PDF document text
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/40706656730.pdfIn PDF document text
    • http://tonystelly.com/clients/873487/File/88764515370.pdfIn PDF document text
    • https://xn----7sbbjg7ctfs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8de43323fb4302e71ec82d2704b234ed/65442430315.pdfIn PDF document text
    • http://fairbank-ia.org/admin/ckfinder/userfiles/files/84119644304.pdfIn PDF document text
    • https://glbtrader.com/userfiles/file/xemalakalixibix.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/opdlvkhj4bicnmmkqnnce8f5jbglk9c7/67474931162.pdfIn PDF document text
    • http://mastrodibaglio.it/userfiles/files/12597204841.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160857e6246ed2---17776108381.pdfIn PDF document text
    • https://marljivo.hr/UserFiles/files/zupavifakikurelazon.pdfIn PDF document text
    • http://gustosandvic.com/ckfinder/userfiles/files/75809201042.pdfIn PDF document text
    • https://etadelloro.it/images/file/luvataw.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/97261793983.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/a3c09b5a31c13585660ba339722fffdb/zelisegefakis.pdfIn PDF document text
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071cd5bdcf08---78767172444.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/80697714402.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160818d0d9f98b---suwuwabi.pdfIn PDF document text
    • https://olympicwroclaw.pl/zdjecia/fck/file/pokamitote.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=sop+etika+batuk+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_off0000e0e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F5 17728 bytes
SHA-256: 5eaf5e95d3926de525c09762b135223ff9abd6b8740ece96173621ec90ac61a3
font_02_sfnt_off000126e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126E7 10480 bytes
SHA-256: c44917e129d30cd3a68838ee0376aac67164b73103c54fdacd8a6a9ba3ac3bd8