Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf689ebc663a837f…

MALICIOUS

PDF

84.1 KB Created: 2021-08-30 05:37:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 948b892d5c8b7ae435abacc785feb50d SHA-1: 140f370078e51b76348605a58dcca514c3bcfacc SHA-256: bf689ebc663a837f0325363c9988e98599e6b30fb21bfb3e5676343257a74c44
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, pointing to multiple compromised WordPress sites and potentially disposable hosting. The embedded URLs suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/7792bc4af75fa3898e022317b2d85155/75771568024.pdf In PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b6a879c58bc---zilukumomedebamavo.pdfIn PDF document text
    • http://swaving-stalinrichting.nl/ckfinder/userfiles/files/rejitejubanekebivebefumu.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/9f4b9bdc17fa596d71606a8a4d09decb/75786385848.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a84fff13f39---16964642168.pdfIn PDF document text
    • http://barbusci.it/maisUserFile/file/71376200962.pdfIn PDF document text
    • https://micsys.in/userfiles/file/73143166541.pdfIn PDF document text
    • http://qlinairnv.be/userfiles/file/wejovefuzabajusijupugu.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160a46382a971f---kifekax.pdfIn PDF document text
    • https://thic.net/plugin/ce1/ckfinder/userfiles/files/13438022369.pdfIn PDF document text
    • http://wanyuantemple.tw/userfiles/file/98116897289.pdfIn PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/56884197554.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5ae983a65---buwixowozolufodumotime.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/2ef52c7494823eb16a3b0bfeb54870d0/27851286470.pdfIn PDF document text
    • http://paykaaluminiya.ru/ckfinder/userfiles/files/xubulevorupemoxababe.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/jebebojepisuzorovugeten.pdfIn PDF document text
    • https://bloomland.com/sites/bloomland.com/files/zijukipitixunube.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/161078c7e37b64---42143534318.pdfIn PDF document text
    • http://www.afurg.com.br/assets/ckfinder/userfiles/files/84515016622.pdfIn PDF document text
    • https://beytarimcilik.com/admin/editor_resim/file/93595946100.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=st+vincent+walk+in+clinicPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D1 10152 bytes
SHA-256: 3d9f71e7ff46c43c6380d6825e7b50ed74565ea5d000411e54f0e17858da3f4e
font_01_sfnt_off0000f9b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B0 18356 bytes
SHA-256: 8c7f59b1fea8999ad8e10fd9cd24cae6ab612b17919d31e0c827b10f8bbf0f6e
font_02_sfnt_off000128b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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