Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ef2195fa18e1bf2…

MALICIOUS

PDF

86.2 KB Created: 2021-09-07 12:04:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5d96eaae94b29c43215db36850efebbf SHA-1: 96da903bfb8e42b4555c2b3babcc2280198d6059 SHA-256: 3ef2195fa18e1bf20039fa9a8635d506994ef4f338ad7a6ee5ab69f76e0993b5
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Several heuristics indicate the PDF contains a link farm pointing to compromised WordPress upload storage, suggesting a phishing or malware distribution lure. The document body is heavily obfuscated and unreadable, but the presence of numerous URLs hosted on compromised sites strongly suggests an attempt to redirect users to malicious content.

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 https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/fmg2nss7akoc8s5r727qilajdi/vepivesaradulijo.pdf In PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/45187279939.pdfIn PDF document text
    • http://mamam.by/upload/File/file/74325421911.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160923733c6d79---6484400155.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/22092626162.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160f06876030ac---25898572766.pdfIn PDF document text
    • https://kaptenhoki.com/contents//files/36044266368.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/504a34c82145c2cf649e1c3770ef0f8c/75791895479.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/2e0760eeddddcc8862833fdfa6946897/poxizaxogutekasevew.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/qead13s2qj5k93rgbucuifvuq0/ronufatogatopemet.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/33747086833.pdfIn PDF document text
    • http://gfb.it/upload/fck/file/86223237352.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/wofubumexemizab.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084ad6d2534b---15166388957.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a70fe068ec1---fofisokabeni.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/4b242b7f83b58ffd25dd88f932be3b45/33676832872.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/borosusosejinavobodewefa.pdfIn PDF document text
    • http://jhroseclassof77.com/clients/45984/File/83008260804.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160723a45663fe---44588014902.pdfIn PDF document text
    • http://xn----7sbakn3aoflleitf3m6a.xn--p1ai/userfiles/file/12038069547.pdfIn PDF document text
    • https://obermeyer-modemarkt.de/upload/file/ravebofib.pdfIn PDF document text
    • https://saatyapi.com/upload/ckfinder/files/98833187662.pdfIn PDF document text
    • http://murphysbeads.com/clients/54316/File/56662597768.pdfIn PDF document text
    • http://nuovartea.eu/userfiles/files/lamatimogot.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/bgdb8t751b7q4vq1jjqrts793c/46883246765.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=introduction+sur+le+r%C3%A9chauffement+climatique+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_off0000e440.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE440 11236 bytes
SHA-256: 1a7b0fefef5e5302b605b7a0d45031e0abe207896e6780aeb71d9a7ad25097ec
font_01_sfnt_off0000fdda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDDA 19944 bytes
SHA-256: 436f35d372b5a5394625d25e380ae486a7df3a819e8f15d230dd7412d67bd773
font_02_sfnt_off00013003.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13003 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1