Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0c3950f69e29382…

MALICIOUS

PDF

85.2 KB Created: 2021-06-30 11:25:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 2c01e6bcd45139e07576dcebad97d400 SHA-1: 568e7af541296aa13c1ce4bd8d999ec712dffb7d SHA-256: c0c3950f69e29382e0469d67aa1c136df9469615f98860b1d8062cb83531b199
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating it likely exploits a vulnerability for client execution. It contains a link farm pointing to multiple domains, including compromised CMS uploads and disposable hosting, suggesting a phishing or redirection scheme. No scripts were extracted, but the structure and URL patterns are consistent with malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://kermoulin.com/userfiles/file/nidewizijekuwopelopo.pdf In PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/22896666694.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608259c06e1d8---zesuzamedi.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/7h083dhucbag45vulcq7a57pp7/658101244.pdfIn PDF document text
    • http://bigband-ulm.de/userfiles/files/7961384690.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/92vc0t51lcvhrln86o1ftf4u1d/17949272003.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/1b77d58cbf15a4556ca05e2609468f08/xavolokijupunoka.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6580a765c3---bakejibufozaxanofadaj.pdfIn PDF document text
    • http://illinoislivestock.org/userfiles/file/bikif.pdfIn PDF document text
    • https://nguyenthelong.net/userfiles/files/zefukaxetulikoxetudare.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a91e443c3c7---sibegasilivefuxobamuzopa.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/9e9i1h07ek3qpdtcvvn9l65n59/89694531862.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3e7f35683---jidisizujegamowisusup.pdfIn PDF document text
    • http://bdn10.cz/files/file/pijati.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a1f2946373---74515959013.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/kitusexegitogukukatop.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/pujof.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/sidititaw.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/8d00463b27d2faf721e458ca935cf461/68456171035.pdfIn PDF document text
    • http://simonide.org/userfiles/file/bufuduriremelip.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b462985148d---nerifijonunobuvogejasaxo.pdfIn PDF document text
    • https://zzhqhi.com/d/files/62821882581.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/purgasutkjq8b46us52brqdtjc/72545773345.pdfIn PDF document text
    • http://mpu-beratung-brendle.de/userfiles/file/42209754230.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bdbe3c0a102---63600151767.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=cable+controlled+bulldozerPDF 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_off0000e8d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D2 10432 bytes
SHA-256: 1a68ff5eaaaf2bc15b529dd930a085c72257061e5409f5b7ff87cb35304b7558
font_01_sfnt_off000100a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A5 17780 bytes
SHA-256: b16e96da73b410fed03a5d1368e3c0d7d9e71958019f0e0dc234cb0b4c08f3a5
font_02_sfnt_off00012f34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1