Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e44b24443e51d92…

MALICIOUS

PDF

83.2 KB Created: 2021-09-02 21:29:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a9171879166fc595bc774dda7c6aa864 SHA-1: 16b9a1a713e024d4e69402298905bb81e28ee956 SHA-256: 7e44b24443e51d922c8e31c8b01792a28ba93801de16eb00c90b475c22cf3d30
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable, so the rationale is based on the heuristics and URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/61fbee2bc0fb6d8bde870f00489dc8e8/feluxaxevozumif.pdf In PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/945accec8c98838e7983b3aad74c8ea8/modojeba.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/1623f93cf49cba1d75014913f6e4e327/wodomolupofawaza.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/db2a7rfmlefjkpm4klkc1d3bc3/27776896944.pdfIn PDF document text
    • https://mai-avto.ru/upload_files/file/12628680599.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c790549a2f9---67488314254.pdfIn PDF document text
    • http://sensi-leszno.pl/userfiles/file/17435070253.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/63fc30cbb9d28ecc3107e5972ace6d80/xixogimoxoxogirorewapexo.pdfIn PDF document text
    • http://topimmigrationlawyer.org/ckfinder/userfiles/files/rewovivurezovomitin.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da0c9367445---bodubo.pdfIn PDF document text
    • https://publicbridge.pl/userfiles/file/riwebufivibutalo.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/2eba190hluscvdqi25fb19inr0/wudibosudurusuwegenegegud.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/mikosemiwutarezu.pdfIn PDF document text
    • https://justforjetscatering.com/userfiles/image/files/42289861976.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/nuwetovebezu.pdfIn PDF document text
    • https://stayinbranson.com/ckfinder/triplebuserfiles/file/92809500821.pdfIn PDF document text
    • https://cristalensi.com/public/File/koreramefavifer.pdfIn PDF document text
    • http://yuha.be/_files/file/solazinujasuwigezikatazi.pdfIn PDF document text
    • https://jmtours.co/aym_image/files/56729132074.pdfIn PDF document text
    • https://fitness-sport.it/userfiles/file/refobezerarexerogud.pdfIn PDF document text
    • https://kvkumariajnkvv.org/singhania/downloads/file/sunipavubivowi.pdfIn PDF document text
    • http://lixupeng.com/uploads/files/7020386496.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/121d2961038e26ee6664c2894d269ca0/sivelaretinubijaxinef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=circutor+computer+max+6+manualPDF 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_off0000dcc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC0 10768 bytes
SHA-256: f7e3f45e4ca4deee9740834133ff73201a693748b4362d74f600f100839d0cd2
font_01_sfnt_off0000f589.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF589 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D9B 18948 bytes
SHA-256: b7cfed18aeec2b28ba9ca8a1b569c54fcbfb53a76a9b386b8643d37a2149872f

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