Malicious PDF — malware analysis report

Static analysis result for SHA-256 9caf9f912549ffa7…

MALICIOUS

PDF

90.9 KB Created: 2021-07-23 06:12:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 42a20329cfa1c5d7c0b4e3cff0f86523 SHA-1: 11ba730c4d39e88c484e6eec2cd5c64a1d6ebbbf SHA-256: 9caf9f912549ffa7b1143d0b6d5fa3c48f139dd7d2c97abb177f9d9b997bef33
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://coaching-jk-academic.com/ckfinder/userfiles/files/31398171714.pdf In PDF document text
    • http://vkts.se/userfiles/file/wemikanokamunasufoperema.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/6c8ad646330c32fe9f8428db2847870a/28782979025.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c91e322ecd---vosakog.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/a9d3c99f1d1d6c65733b509b4afe9b0a/zozosovujo.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4dcb429020---kafimiwazar.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/2753925802.pdfIn PDF document text
    • https://implantsdentairesdesmoulins.com/upload/editor/file/14061710777.pdfIn PDF document text
    • http://bjjiffy.com/upload/busaveterufagujotu.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/27416422906.pdfIn PDF document text
    • https://batikatravels.com/userfiles/file/nasolugiposisuj.pdfIn PDF document text
    • https://vnsteeldetailing.com/UserFiles/files/86554398953.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/3903159a66610d122d8a044eb31c16c3/71894000515.pdfIn PDF document text
    • http://motivationandmomentum.net/ci/userfiles/files/veketesomusidolimam.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160833fe920a43---40188890137.pdfIn PDF document text
    • http://sloplast.com/userfiles/files/jumudutotiwekakob.pdfIn PDF document text
    • https://speakingparrot.com/upload/ckfinder/files/33848239276.pdfIn PDF document text
    • http://manpukulivermore.com/uploads/files/47590392828.pdfIn PDF document text
    • http://school19-zav.ru/userfiles/file/jepimikatesujewok.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/280726236278.pdfIn PDF document text
    • https://www.frontiermea.com/sites/all/libraries/ckfinder/userfiles/files/13007272032.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/a09f7dadfd521910f7864b7dcd52ace6/73966230677.pdfIn PDF document text
    • http://goldenpeak.it/userfiles/files/37113078638.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=enigmatic+meaning+in+englishPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_008_off0001406e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1406E 17476 bytes
SHA-256: 1b18b16186a43bee3c5cca7128b113caeb520b28856ded0ec49c057b92d6d0f6
font_00_sfnt_off0000e211.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE211 17880 bytes
SHA-256: 632336ec31080c31fef552757d7163032b6314e4759a98e2847d683c87f3b7f0
font_01_sfnt_off000110e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000128f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128F9 10440 bytes
SHA-256: a8311955d5b9e6a8f510e592f849bb095d7bb028a4eb99e6186996af7b69ef54

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