Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5f5faab39cf1073…

MALICIOUS

PDF

88.3 KB Created: 2021-08-20 10:54:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: c6b9e3e18efeb22ad3cef27db1fd6017 SHA-1: 4f1a13500fa1f050f7a318338fa1417850026560 SHA-256: f5f5faab39cf10739e410830b6f623f57d058cd19a658f892ded762543c853c2
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 upload directories, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were extracted, the structure and URL patterns are consistent with a malicious PDF used for initial access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/57c0276eb0a4b7db700535165bcb1842/bemewebinebagoris.pdf In PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1606c732b19916---47329157554.pdfIn PDF document text
    • http://arcos-eff.it/userfiles/files/12608696922.pdfIn PDF document text
    • http://budoprojekt.eu/obrazy/file/37844291099.pdfIn PDF document text
    • http://colegiosantarosa.com/uploads/imagem/file/kavofevekaferirozomexojeb.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/cfba80f384ecfd78b445719cf7d1fe87/gupove.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160abd4221549e---76671725811.pdfIn PDF document text
    • http://rotarycochinharbour.org/ci/userfiles/files/13900780317.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160abab082def9---63053377829.pdfIn PDF document text
    • http://nktrading.qa/file/files/zadujunagijapop.pdfIn PDF document text
    • https://hgb.se/filer/file/96032456124.pdfIn PDF document text
    • http://uticachemical.com/files/upload/files/jimixevonolikuxawixepu.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a254a844bd5---xowarojisufotavid.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021070803490569.pdfIn PDF document text
    • https://pacpartner.net/images_client//imagesfile/33469275946.pdfIn PDF document text
    • https://shellserva.nl/docs/Image/file/4990365825.pdfIn PDF document text
    • http://besteva.com/upload/files/setade.pdfIn PDF document text
    • https://siriusdynamics.com/assets/uploads/files/16951302696.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/b69766e7b1f860e224fe326bd0e992d8/tewoxipokimisozatudafef.pdfIn PDF document text
    • http://obchodsezlatem.cz/upload/files/62634785855.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/ce80ce266f47de5e157a54d55431a497/mobikojefutodalenefab.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/ae81252f60240661a39733b5292dd5f4/17241823349.pdfIn PDF document text
    • http://hawaiianhunareiki.it/file/livusofijoduvida.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/pukebinofotixivagurigu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=b%C3%A0i+t%E1%BA%ADp+v%E1%BB%81+reported+speech+with+infinitive+and+gerundPDF 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_off0000dfd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD5 11756 bytes
SHA-256: c3ca7551540c556a79ec9bd5e30b2270d5a47737b748e261cd79e86edeeb549f
font_01_sfnt_off0000fab4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000112c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112C6 31200 bytes
SHA-256: a49d9443c24b0f816f49c521bbdbda4ebf3abffecd4765e39a51fb515e8cab0d

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