Malicious PDF — malware analysis report

Static analysis result for SHA-256 018b40938e4ded5f…

MALICIOUS

PDF

111.4 KB Created: 2021-06-29 21:38:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1bb6f384fe98aa85d39b7e104b55c2e6 SHA-1: 46c7f60e49befa5eec3e78235fd1d8bfd42ddecd SHA-256: 018b40938e4ded5f840c82cab3ca8092be29e32e2c0c927cb840503c73527c25
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple external websites, many of which are hosted on compromised CMS platforms or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of numerous external links, including those on compromised sites, supports the classification as a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://queure.ru/uplcv?utm_term=mindfulness+questionnaire+for+students+pdf
    • https://x-software.cz/data/file/lanifafazej.pdf
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c669fda541---junopusuwaketirugagemus.pdf
    • https://proxus.nl/file/niwumokow.pdf
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/7b1b9e9c4a46272c2a1f0bb545b99c51/koxozux.pdf
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608135a7185b0---wojodusafilogugiguxobog.pdf
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaf61789449---9769981422.pdf
    • https://fanaf.comarticle_ressources/file/47231784554.pdf
    • http://seamacros.com/upload/file/lumazitiponabetuzi.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606e671363977---vipuzadejemu.pdf
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/13e8aa359aacccc545581e0a6e7cf753/69899415091.pdf
    • http://dgjinhak.kr/DATA/upload/files/202105270216323511.pdf
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/2m94h5bkrh1usst65uttejq43e/fuzarejis.pdf
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/07h40r7o783cddan7hg47v34t8/45258385331.pdf
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b613a64e60e---futewuboxosigokuj.pdf
    • http://bike-aholic.com/UserFiles/file/62478365886.pdf
    • http://transbur.ru/admin/ckfinder/userfiles/files/58003799138.pdf
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c6a464b690e---69657880422.pdf
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/gipaxewifivosi.pdf
    • http://nhatngungoisaoxanh.com/upload/files/83574723459.pdf
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b430b7ef1---vimisubafetemesij.pdf
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16086d14eb76d1---pubowuno.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/a8pudealbslushkqnojdm56gep/xerojenizurutirewofenis.pdf
    • http://ssteelelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/22970969884.pdf
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607dc36c22bba---26329435913.pdf
    • http://remproekt-m.ru/admin/ckfinder/userfiles/files/befaboralekodijezow.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015047.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15047 16792 bytes
font_01_sfnt_off00016859.bin
a1261812978909fb9823a1728ac26c403110207417df5b39c3c35cd3eeb9b6c7
pdf-font-stream PDF embedded font (sfnt) at offset 0x16859 18344 bytes
font_02_sfnt_off0001978c.bin
fb0aaf6f31258cc34f31fe5ac3e3f30152495baf4c4288a1bf688028a5033cb9
pdf-font-stream PDF embedded font (sfnt) at offset 0x1978C 10728 bytes