Malicious PDF — malware analysis report

Static analysis result for SHA-256 f29eeecdc872b757…

MALICIOUS

PDF

78.3 KB Created: 2021-09-05 14:05:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f98f1598fc8b35ecc3fca13500c190d7 SHA-1: 6adacb78da67912413414f25a97d37721e52b74d SHA-256: f29eeecdc872b7575313d3f5c948ed254f3e1d6786bf64a0240c20dcec81e7cb
164 Risk Score

Malware Insights

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

This PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external PDF files hosted on compromised WordPress sites and disposable domains, suggesting a link farm designed to distribute malware. The presence of a 'download button' lure further supports the phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://xn-----6kcaheblih5ab0a6afqbzoqe.xn--p1ai/ckfinder/userfiles/files/24360028221.pdf In PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/bf3ef6e05bb57033033d01ad584bdbb9/tonuvabitifavikiraji.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608c69cc42342---14350614288.pdfIn PDF document text
    • http://citysuji.com/ckfinder/userfiles/files/wijojoni.pdfIn PDF document text
    • http://bodymindspiritconnection.org/clients/5/53/53f1eac0d8ee32431a47b4e1af774f29/File/57734660962.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/demul3qm626h6ssl0tgmro00t2/21667453128.pdfIn PDF document text
    • http://okwecare.com/usr/userfiles/files/tevume.pdfIn PDF document text
    • https://ferest.ro/imagini_ws/silikuzowubatifolebima.pdfIn PDF document text
    • http://yomamasushitogo.com/uploads/files/sixujigevapuboxi.pdfIn PDF document text
    • http://kemmurad.com/webroot/img/files/29503133802.pdfIn PDF document text
    • https://swalaya.in/userfiles/file/95349295664.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c106ac45717---marisojuruxe.pdfIn PDF document text
    • http://acmemask.com/upfiles/editor/files/buxidir.pdfIn PDF document text
    • http://biswasi.com/userfiles/files/11360499892.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/5647603951.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f80683d0a7---94496920414.pdfIn PDF document text
    • https://highendteen.com/userfiles/files/44776477835.pdfIn PDF document text
    • http://ewtch.com/upload/files/rujupivexawowasege.pdfIn PDF document text
    • https://petala.gr/userfiles/file/fevunisuriwebud.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/4080f0675dbabff0d1a0f185d65c80a2/jokasufixuxoxo.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/3d1f6cdbv4sb199u29rpji1s96/52454230732.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=combine+pdf+files+preview+macPDF 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_off0000cc7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC7C 17540 bytes
SHA-256: a43fcf67f2061d159727bc0b8dc7aa84636a8ebf71694d9ad42270d7c4023ddc
font_01_sfnt_off0000fa17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001122e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1122E 11004 bytes
SHA-256: 8938ced59e02b686a269e15e8db0aeeef65e8e6ae10e560fc46dc4ff06f2c4ed

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