Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c028218863cf378…

MALICIOUS

PDF

68.7 KB Created: 2021-09-09 10:54:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 963d10cafc81745d85a8c56f1c7afb9d SHA-1: 525c48dac3c998353e0b9721534f54fd2faa3d79 SHA-256: 5c028218863cf378dafae1fd45551bce0dff786d747f8498b8e2ef2357ff6a4c
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF exhibits characteristics of a phishing lure, including an image-only presentation and embedded links. Heuristics indicate it's a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. The ClamAV detection and ML classifier further support its malicious nature, likely serving as a delivery mechanism for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 1 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://idosekotthonaveresegyhaz.hu/files/files/33249757431.pdf In PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/wexuzimijolazesufabu.pdfIn PDF document text
    • http://vigen12.com/userfiles/file/wemuruturenajomodeboso.pdfIn PDF document text
    • http://familiegravesen.dk/ckfinder/userfiles/files/8679787956.pdfIn PDF document text
    • http://donleroy.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/58707682427.pdfIn PDF document text
    • https://jensbrode.de/files/file/5877887098.pdfIn PDF document text
    • https://lesartsdansmonjardin.com/userfiles/file/20210901083555.pdfIn PDF document text
    • https://dukra.sk/editor_uploads/files/jalixinesemobikasudate.pdfIn PDF document text
    • http://cargologicru.com/sadm_files/75587540207.pdfIn PDF document text
    • http://namjapizza.com/app/webroot/files/xupatixa.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/ud9hpvhcdehht5aatk9kfs27h7/8975983648.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/6a6cea24ee56b838015efd65c20d1d28/35868639472.pdfIn PDF document text
    • https://caror.hu/ckfinder/userfiles/files/17566523810.pdfIn PDF document text
    • https://tunguoilon.tunhua.vn/ipp/images/uploads/files/xasewoxusemoli.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/16139519918a9e---4864775181.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139642182580---dedimovafujarokig.pdfIn PDF document text
    • http://zhuoer.ltd/userfiles/file/45216330588.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/86969952578.pdfIn PDF document text
    • https://clubon.top/uploads/files/87851155667.pdfIn PDF document text
    • http://bradzo-ep.com/uploads/files/nesutogokuroleni.pdfIn PDF document text
    • https://gegeny.hu/uploads/file/33438267142.pdfIn PDF document text
    • http://invismortgagebroker.com/images/file/9312091602.pdfIn PDF document text
    • https://krantiservice.com/ckfinder/userfiles/files/misofus.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/7ks9nsu5ec4ek1pon4uci5v0le/3072084068.pdfIn PDF document text
    • http://maszyny.pl/userfiles/file/relofuvezoduvin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=garena+speed+drifters+apk+downloadPDF 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_off0000b10a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB10A 14316 bytes
SHA-256: bd9e61e25212f824c5c28469ccd251efe503a412a9582eb478030d83afe2fdaa
font_01_sfnt_off0000d45e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD45E 10708 bytes
SHA-256: 8d37eb01ae43e49014c6cec8ddfd3743d0bb1e172b9f9df91ce91108983d878a
font_02_sfnt_off0000ed28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1