Malicious PDF — malware analysis report

Static analysis result for SHA-256 74bdf20ccc1f3d2b…

MALICIOUS

PDF

82.5 KB Created: 2021-08-28 22:53:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7bbdcfaf2d17085c4267a5ab7b64aab1 SHA-1: bfce5b02e0dfb9c89a91ae236e53cfce1bbb1c50 SHA-256: 74bdf20ccc1f3d2b56812b7ac401e7b880b19202dc3646506d6a868ca2a82189
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous external links, many hosted on compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, but the heuristic firings indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://synerhu.ru/uplcv?utm_term=scholarly+published+periodical+containing+articles PDF link annotation
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096be497485a---48166115381.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/ad6b89cc3d7a4f835657969333f67d91/pepajuborobabotebasiziwa.pdfIn PDF document text
    • https://akemi.ro/hirek/file/53003738577.pdfIn PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/dd5e203e7737a942a2fa074b2fb14fba/1357143905.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/5b2b4817e57898c22b7013e262dc7ede/tuparegiboxa.pdfIn PDF document text
    • http://foto-video.ch/userfiles/files/lakurewadujox.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/i287nrlaue8r4kn27guv04bejo/21446811658.pdfIn PDF document text
    • http://schokofontaenen.de/idata/62850403700.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/ed3d3ddd743f0a2d663da098302b0d3b/rodex.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7f42422f6d---74188749027.pdfIn PDF document text
    • http://trungtinjsc.vn/upload/FCK/file/61011572822.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/1c9de6a152b491160626fec8883f853b/dunonixibujeg.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/ib1vab9eib4ddi1q0gmhpcdhuo/zemizetatozotadipo.pdfIn PDF document text
    • http://rent2day.ca/ci2/userfiles/files/nonotixosibikifukufom.pdfIn PDF document text
    • http://northmarking.com/userfiles/files/39920389389.pdfIn PDF document text
    • http://truthtube.com/UserFiles/file/22796765991.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/c7d3e652000d67aadcfbe206fe78628a/76195115137.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/tekurex.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-5-14/20210514040143587742.pdfIn PDF document text
    • https://drisraadentalcenter.com/userfiles/file/lipedurabaxudebabukilo.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bebb06ab12e---jidilox.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/db5f9bc88bee34b3f3e4e07070f2f5b6/dikisenafaredumoganajawi.pdfIn PDF document text
    • https://lapdonline.org/file/56199048515.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_off0000da2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA2E 18368 bytes
SHA-256: db99f12d4b8628f3167112700ebaea8f17f2875d01778a55802813333d27d30c
font_01_sfnt_off000109dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109DC 11224 bytes
SHA-256: e795d439da29a43355d3aae9bb703d22a38c39eeec34c618ac315c98645293bc
font_02_sfnt_off000123ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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