Malicious PDF — malware analysis report

Static analysis result for SHA-256 be5549831fa25a75…

MALICIOUS

PDF

76.1 KB Created: 2021-09-20 07:13:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 70407f0113be2d103c4601ae2c4fe256 SHA-1: 3a3f1894427259483eb114456fc893cc251a04fc SHA-256: be5549831fa25a7509e9beca76da22a532168e7dca2b280d463172499f6e4f0c
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 disposable hosting or compromised CMS upload directories, indicative of a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://huntic.ru/uplcv?utm_term=fm+rk+bansal PDF link annotation
    • https://amgaa.org/temp/files/rikemaket.pdfIn PDF document text
    • https://likeevent.it/writable/public/userfiles/file/jezorokalej.pdfIn PDF document text
    • https://korankertas.com/contents/files/vukapowuzefeziwo.pdfIn PDF document text
    • https://kstraders.com/userfiles/file/maganipuzajum.pdfIn PDF document text
    • https://songhong.info/userfiles/file/rizaxupunar.pdfIn PDF document text
    • http://www.americaninvest.net/upls/files/5527819163.pdfIn PDF document text
    • http://aesg2edcv.handylover.com/upload/files/45927335164.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131d3635931d---penosotegi.pdfIn PDF document text
    • http://dade666.com/userfiles/202109file/2021090404461470554.pdfIn PDF document text
    • http://rc-mst.com/mst/_upload/files/51886854340.pdfIn PDF document text
    • https://atamergranit.com/userfiles/file/samufapatud.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/zupuremagakinomogomagig.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161403900be6b2---14073864087.pdfIn PDF document text
    • https://bdprescription.com/ci/userfiles/files/61090478642.pdfIn PDF document text
    • http://yavuzselimvakfi.org/resimler/site/files/82913332373.pdfIn PDF document text
    • http://upnbkk.com/file_media/file_image/file/desevumomuluwetawaleb.pdfIn PDF document text
    • http://93564497.com/userfiles/73300120340.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/84422173845.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/f6876hlv1raip7tm61sphfuphf/gaxemiwafuwaruzoxo.pdfIn PDF document text
    • http://telecycling.info/files/file/28049342978.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b9ab68998a---wurixowusiwebun.pdfIn PDF document text
    • http://ahjygjg.com/upload_fck/file/2021-9-1/20210901100423361429.pdfIn PDF document text
    • http://computergramm.com/userfiles/file/20855712595.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16136682ea7541---nolibibi.pdfIn PDF document text
    • 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_off0000c7b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7B3 10036 bytes
SHA-256: 289fbd56eb4973d946acd877b777d72c14cffd4f788ee2002bcc94c934c4344b
font_01_sfnt_off0000dde2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f5f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F4 17436 bytes
SHA-256: 9f3afd0aee289da42659c14dac6cad0a8175b8044bc90d26e8378f41dc320866

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