Malicious PDF — malware analysis report

Static analysis result for SHA-256 9efc8f119c4482d1…

MALICIOUS

PDF

83.1 KB Created: 2021-06-29 22:09:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 89acaa237d1963607c5b75461a651da3 SHA-1: 57332336caa3963f19d4cf618bf4eb46698d1045 SHA-256: 9efc8f119c4482d1d7792af3249289a666a9218cbb89ccade4f603f7203a89b9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://medvor.ru/uplcv?utm_term=financial+analysis+and+accounting PDF link annotation
    • http://legendtec-eg.com/wp-content/plugins/super-forms/uploads/php/files/qf8lldqtbhhjluj2crcvflmbt5/8992145490.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/3dc1f66071d740d0419304dcb193d21a/lufopoxerojinovadogalo.pdfIn PDF document text
    • http://trineckevzdelavani.cz/webpagebuilder/ckfinder/userfiles/files/gelabemiwagobugobolerege.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/4ad83s1j03jfddmjg7ee4t3k05/jezibobofimukelujizi.pdfIn PDF document text
    • http://uniquecharacters.com/upload/files/xozopateliseladosetesivaz.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16087945cb24a1---81806387751.pdfIn PDF document text
    • http://melly-incendie.fr/img_db/jimutur.pdfIn PDF document text
    • https://mollis.rs//files/8566349850.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f892898bc0---80567280029.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/e9b2328e8047b66d700099644e4a7459/mivadakibinenisabifet.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/gekijulowugamenizeni.pdfIn PDF document text
    • https://picinterior.com/ckfinder/userfiles/files/33692367412.pdfIn PDF document text
    • http://www.ximangsongthao.com/app/webroot/uploads/files/63428711570.pdfIn PDF document text
    • http://www.dramayaramendes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160706b344b7aa---70758142756.pdfIn PDF document text
    • https://maplesservice.com/wp-content/plugins/super-forms/uploads/php/files/4b39e5d4c55595afb42b3c79c10941e7/jerix.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/l47tn13b1u4jm957gbg73qjrt7/86059464339.pdfIn PDF document text
    • https://bloomeng.com/uploads/jufederu.pdfIn PDF document text
    • https://folklorebridge.eu/uploads/pictures/files/ligamikejixik.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b78656536c0---24350206102.pdfIn PDF document text
    • http://treeoflifetolfu.com/clients/0/07/07f122ebb3396bb3f917f2e62af81596/File/bixotodolawowekanuxixaj.pdfIn PDF document text
    • http://grandchainfamilyfoundation.org/clients/85333/File/nujifesotolubokowegisob.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072cd56f154f---venoxovumiw.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16086b06930f21---wexifubereze.pdfIn PDF document text
    • https://lapdonline.org/file/51059171335.pdfIn PDF document text
    • 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_off0000e204.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE204 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA16 17172 bytes
SHA-256: 3e7a6d37e6b29693e3cafded0f619b59e08e08814f02279b5d1b8de0726c4f33
font_02_sfnt_off000126e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126E1 10504 bytes
SHA-256: db64e6ccc4464248555ff7a5bb8951280f2bb8695c582a0dd3f207a7af55a88d

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