Malicious PDF — malware analysis report

Static analysis result for SHA-256 09d50bdf4dec2858…

MALICIOUS

PDF

67.8 KB Created: 2021-10-02 13:38:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 32a1d809c72c7e17a7b472ca0a49bd7f SHA-1: 232bc40555bae1cbf4955f5dbfee9c164ccc39b4 SHA-256: 09d50bdf4dec285878f034d12ae779a9b4018fae3987bb833b87375467186805
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its image-only nature and embedded clickable links. The document body is heavily obfuscated, but heuristics indicate it contains a link farm pointing to compromised WordPress upload directories. The primary purpose appears to be directing users to malicious PDFs hosted on these compromised sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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 0 text block(s), carries a click-outward action, and is only 67 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://pistant.ru/uplcv?utm_term=hamlet+study+guide+pdf+download PDF link annotation
    • http://helenhotel.vn/upload/files/wisezivutatekivawugil.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/68384960588.pdfIn PDF document text
    • http://limuzine.md/userfiles/file/66276902750.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bbb00e6844---maxomafopemikizi.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/161508bb83a608---50887082522.pdfIn PDF document text
    • http://candientu24h.vn/webroot/img/files/82787431447.pdfIn PDF document text
    • http://cukorbetegshop.hu/files/dojozudikupirek.pdfIn PDF document text
    • http://colantuono.it/userfiles/files/77545024150.pdfIn PDF document text
    • http://erictex.com/ufiles/files/piruwevowod.pdfIn PDF document text
    • http://hotdeals24x7.com/ci/userfiles/files/90459891161.pdfIn PDF document text
    • http://biaikatolikus.hu/files/file/71871311640.pdfIn PDF document text
    • https://akanaymatbaa.com/calisma2/files/uploads/munadalojajotofa.pdfIn PDF document text
    • http://redactron.com/userfiles/file/18161393537.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ad202500dd---tefegesusegatuta.pdfIn PDF document text
    • https://guineaservicesproviders.com/gsp/files/batakoneluferedekejatuvuw.pdfIn PDF document text
    • http://dealershop.es/userfiles/file/45053222304.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/xavis.pdfIn PDF document text
    • http://modellszerviz.hu/userfiles/file/70240286881.pdfIn PDF document text
    • http://stellarp.com/userfiles/files/60384438191.pdfIn PDF document text
    • http://tchid.net/userfiles/file/putifotejoxejaxaveva.pdfIn PDF document text
    • https://sibois.eu/userfiles/file/kolukawijewo.pdfIn PDF document text
    • https://talaa-obour.net/webmisr/uploadwebmisr/file/xesedatudivij.pdfIn PDF document text
    • https://hawkseyetravels.com/assets/ckfinder/userfiles/files/87222909829.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_off0000acb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACB0 11032 bytes
SHA-256: d3316f59befcf2b92c40d5b7efb927d8bc4b27d922c291485a611f43bb5e9c89
font_01_sfnt_off0000c629.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC629 14340 bytes
SHA-256: 0da0aa85d0d5fa0f6bbab7ee57d555a028565fb5511b8f07a7bc91cc1ac03cae
font_02_sfnt_off0000ea09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA09 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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