Malicious PDF — malware analysis report

Static analysis result for SHA-256 c997db90426d6a25…

MALICIOUS

PDF

79.9 KB Created: 2021-09-02 09:16:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f2721bcda2f3c2d02343393ff6e21963 SHA-1: ab6ba0dde4ab963afa0161766d9b4c261cb507c2 SHA-256: c997db90426d6a255bd2a0c3c60b926a733220b9206925d9b8aaf7c833c292c1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document functions as a link farm, directing users to numerous external websites. Several URLs point to compromised CMS upload directories or use disposable hosting, indicating a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://alemotta.com/resources/original/file/mufovox.pdf In PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/a183cca1dd9a8f04b6623c5145943fec/fopafonarepanovik.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607725c825942---kevaruwonekumi.pdfIn PDF document text
    • https://igraonica.me/userfiles/file/nokadigomuvovigatebeka.pdfIn PDF document text
    • http://contrast.no/ckfinder/userfiles/files/50997101681.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/46255636095.pdfIn PDF document text
    • http://fkhd.cz/data/img/mewimenukolidusifesalim.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/ctbos0tssg0fl4b77tdbv8gn75/kitokuvuteduguzapejugeta.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/35198052131.pdfIn PDF document text
    • https://amoslodge10-org.alljobsinliberia.com/ckfinder/userfiles/files/86595314405.pdfIn PDF document text
    • http://gorillatheory.com/admin/upload/file/bixevosofivitufodusijobe.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c64e658196c---vekutet.pdfIn PDF document text
    • http://drive4smilesquebec.ca/clients/f/f5/f58105ca183540932673f5bf18e62671/File/panizelaxoloxiludu.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/d316af666b4f13ebc25a571270fff057/felino.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6078d5323---tikedexiguwopuzu.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/7537362951fec94976c06d32584da3c7/14023055590.pdfIn PDF document text
    • https://sportsht.com/userfiles/file/xukesixifavebaliv.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161256c8701f55---dagofed.pdfIn PDF document text
    • http://rdmsrl.it/userfiles/files/33417679297.pdfIn PDF document text
    • https://efsanepin.com/calisma2/files/uploads/kedozexetakapupudal.pdfIn PDF document text
    • http://crmrealty360degree.in/userfiles/file/lalitapakujorevaw.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/311bba21a1510bf3d6d1b2e77917071f/susovubepefiwad.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16119620161d8e---sages.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=evergreen+class+9+social+science+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_off0000d226.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD226 17472 bytes
SHA-256: e9580c88cf3db8f5168f010700be908a3c2647747bf3ae2a13800465d19fb351
font_01_sfnt_off0000ffae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFAE 10916 bytes
SHA-256: 6e333fef127210233df9169540dfd2d98d2e783c10aec3fe81f5b5774ebc5ccd
font_02_sfnt_off000118dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1