Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cf25b1432c84c5e…

MALICIOUS

PDF

94.5 KB Created: 2021-07-30 17:45:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e58d8ed935551e6326ed576be9589f5f SHA-1: 284e2b2e842f0f10b5cfeb038052591c992d6304 SHA-256: 5cf25b1432c84c5ee82319587ece0ef1218df18c135fcda6cbe72be94a393250
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://queure.ru/uplcv?utm_term=paper+princess+book+3+pdf PDF link annotation
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/fafd0bdd024a441751275cbcce2228e8/lobowolij.pdfIn PDF document text
    • http://furniture83.com/upload/files/63709629999.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160dce84c0c8fa---50451101749.pdfIn PDF document text
    • http://blackhorsesc.pl/userfiles/file/lepogasupe.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1d5a9c8523---29420745235.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/derusowedeguveliwalimar.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609e0fd35460c---letalu.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/53681161641.pdfIn PDF document text
    • http://pet.nfe.go.th/m_site/ckfinder/userfiles//files/9719456362.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/26703726906.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/lajufogoza.pdfIn PDF document text
    • https://aquatrustfina.com/userfiles/file/baxixekuwaterelowumuku.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16093527920c3d---17683112331.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/43606cd8cda45e425d49e6dce2a9108f/62369836863.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1606c902b71b28---83516679412.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/66f13dc09ce155215860d6bb5401ae34/fizuzem.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/71c34469e2637471489c0ecf4221cc2e/90789284002.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/18501982397.pdfIn PDF document text
    • https://drivetripper.com/userfiles2020/files/44626454479.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/2a23122fb69b5a8969a2caf37496b122/14670747954.pdfIn PDF document text
    • https://masini-de-ambalat.ro/images/userfiles/kutogeribo.pdfIn PDF document text
    • http://cs-golfclub.com/ckupload/files/vusagufenopitifirobakak.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16081b20d660b9---xabijub.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/9qug24rh4dcds3ijpvud2qo9kg/54573335787.pdfIn PDF document text
    • https://taiwancy.com/app/webroot/userfiles/files/47446596956.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_off00010b37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B37 17428 bytes
SHA-256: 019f82e530be3adef239dcea5f2b00f31c303f6c92bb7290d9667b32a4818442
font_01_sfnt_off000138a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138A8 10872 bytes
SHA-256: dcbe8bc18867aeb59f330396057a0a83e6adaf10e75fde6a30bba8e2d6a9537a
font_02_sfnt_off000151b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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