Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4175c14bfd90285…

MALICIOUS

PDF

80.7 KB Created: 2021-09-03 13:51:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3b1a6397f943cad1f0a4c53182ca8291 SHA-1: 4657d12b7534116f614e82e6fed9c2d30564e631 SHA-256: b4175c14bfd90285fc83c46aede212c76f3d3b9d3d9c370c6ddc3100597a2135
156 Risk Score

Malware Insights

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

The sample was detected by ClamAV as a phishing trojan and flagged by an ML classifier. Heuristics indicate the PDF acts as a link farm, with many URLs pointing to potentially compromised websites or disposable hosting. The presence of multiple PDF link farm heuristics suggests a deliberate attempt to obscure the final malicious destination, likely for phishing or malware delivery.

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://businesslife.com/content/files/11126569674.pdf In PDF document text
    • https://bbpartner.cz/userfiles/file/60988434050.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612dea6865603---fomoxamezozop.pdfIn PDF document text
    • http://maility.pl/_ADRESuserfiles/file/21436354787.pdfIn PDF document text
    • http://www.mecateengenharia.com.br/ckfinder/userfiles/files/fofosuw.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/89650956981.pdfIn PDF document text
    • http://ricoconsultingattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kametaserazewiriwinu.pdfIn PDF document text
    • http://sake-tori.com/images/library/File/66792123101.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16090bcc47ea79---32878367107.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/527564214610f8674be8e4.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/14959478178.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/75d119f6dc7f7e4c5c18063f4d5d9e26/57388482623.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e21d36cf3ff---sixajobozugeted.pdfIn PDF document text
    • https://corpus.bg/files/fck/file/46424568300.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3b2495d4f0---demukujotimutamud.pdfIn PDF document text
    • https://farmaciasacoor.com/site/upload/file/wagefurejevidisejapusemug.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/66981975705.pdfIn PDF document text
    • http://jowinbio.com/upload/files/202108061446039895.pdfIn PDF document text
    • http://fsnmmaterials.com/UPFILE/userfiles/files/18889354085.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/bb89d290b844fa0bd876f168afcc63a2/foxiwiw.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/4b9uv7er6fnn6ds77i8clrt9ej/41573104312.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/60074bdb9bbbef955405b015ab60af3f/visalaj.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/eae8a01fcea35ced7be9ac3d2f382377/tagodav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=preencher+pdf+online+gratuitoPDF 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_off0000d3fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3FA 10832 bytes
SHA-256: 9c4d141109217e5afe3b024173820020ef80d7201a0813472962ea7c3422681a
font_01_sfnt_off0000ec9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC9E 17876 bytes
SHA-256: 67b0766e79a5d3238845fbf44ace3dbe7913c399b293b8c5e27100c26cf0c3d2
font_02_sfnt_off00011b17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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