Malicious PDF — malware analysis report

Static analysis result for SHA-256 90fe1581b465406e…

MALICIOUS

PDF

84.8 KB Created: 2021-10-05 14:00:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 342f8edb6e215c36e42ce7f1efaedad2 SHA-1: a959e527cbd2ce206f57acc36cc4c28ca0b9f742 SHA-256: 90fe1581b465406e23401862e1a0d6026835138b15eb98b86cb5572be92f745b
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to multiple compromised websites, likely intended to trick users into downloading further malicious content. Heuristics indicate a high likelihood of malicious intent, with ClamAV detecting it as a phishing trojan. The ML classifier also flagged it with a high score.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://hoadondientu-ptp.vn/images/ckeditor/files/79318711041.pdf In PDF document text
    • http://dfwsedan.com/nbloom/fckuploads/file/60511431157.pdfIn PDF document text
    • http://ventilatoryzlin.cz/images/file/wufegimin.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1615294991baa3---pokuvogo.pdfIn PDF document text
    • http://jolanyee.com/upload/files/202109290654163754.pdfIn PDF document text
    • http://viettelhaiphong.me/data/dulieu/files/77180095660.pdfIn PDF document text
    • https://unstitchedutilities.com/files/file/nunekixalos.pdfIn PDF document text
    • http://lukasikgroup.pl/Image/files/4296693537.pdfIn PDF document text
    • https://eventaipei.com/upload/files/73568831317.pdfIn PDF document text
    • http://elosc.com/upFile/file///ITX202109020400475920.pdfIn PDF document text
    • http://radtel-sport.pl/userfiles/file/32380210554.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/63opjnqgcn1iccuc7fqooo80t5/19267806975.pdfIn PDF document text
    • http://ultrarelaxedcbd.com/newerac2c/userfiles/file/torozoxovivapo.pdfIn PDF document text
    • http://nt-module.ru/ckfinder/userfiles/files/5292211973.pdfIn PDF document text
    • https://anandamsanyal.com/userfiles/file/fusebefilakirowi.pdfIn PDF document text
    • http://doubler-son-capital.com/photos/files/kebokewevolito.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613d2fefa863b---51149645808.pdfIn PDF document text
    • http://gocchame.vn/app/webroot/img/uploads/files/koxiniges.pdfIn PDF document text
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/mufusuladuwefovuze.pdfIn PDF document text
    • http://digitalpolicycouncil.com/imagenes/file/46133760845.pdfIn PDF document text
    • https://superpackeg.com/userfiles/file/kikizafigufojugub.pdfIn PDF document text
    • https://bursakaynak.net/userfiles/file/woguludazeze.pdfIn PDF document text
    • http://flapboxes.com/userfiles/files/15017774878.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=clash+of+kings+mod+apk+private+serverPDF 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_off0000e315.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE315 11136 bytes
SHA-256: e468d8377158386ce72d4e0daf5d63f5df65dc1c3a1416b609b7398e66b2e3ed
font_01_sfnt_off0000fcb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB3 18924 bytes
SHA-256: 8a539e173a76c53acd3777a131694e919d9b366a0a67576ad0a9350ba554ab8c
font_02_sfnt_off00012da4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1