Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ebc5bbfeba9e0ad…

MALICIOUS

PDF

82.3 KB Created: 2021-09-05 15:29:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 617cbfb06da5078da23fa691d06719cf SHA-1: fa5d96bce62a1cd9cf8124065c0fbb87341faf69 SHA-256: 0ebc5bbfeba9e0adda68e38d7cfedd27bb6c5831fee64074f3060f5b6d972397
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these external links. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://medvor.ru/uplcv?utm_term=tutorial+photoshop+2017+espa%C3%B1ol+pdf
    • http://antwerp-reefer-tournament.be/argt/files/10263599080.pdf
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/f6cbf2abaaa174c2739a0e48b9dce175/49046239587.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/do9th3is4llhde2ml87nqhp3j7/65533469674.pdf
    • http://tikatalog.sk/_files/file/kavuveberezirifenis.pdf
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/03baafa6a9e3928ed64421c93368d337/2063125180.pdf
    • http://cuacuonnhanh.vn/Images_upload/files/82517624788.pdf
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/fsmdegnk9g4c6bst8mtbjggd7r/lezoregaxexupetesem.pdf
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160827ecea247a---raparod.pdf
    • https://roweryelectra.eu/app/webroot/uploads/file/16275705393855.pdf
    • http://bajajsports.com/userfiles/file/ponipitutixo.pdf
    • http://bowlingkillers.com/imgdb/files/mojur.pdf
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9b0f89713---xowasa.pdf
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/57o4f42pangqkoeie00ibbb7f5/49464282052.pdf
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/p8jmuaderk2fcrf3jd1kv0uolm/95170519503.pdf
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb12c1acc07---75504360243.pdf
    • http://bangdinhphucat.com/quangbasanpham/app/webroot/upload/image/files/10692853095.pdf
    • http://loscogliodifavignana.it/userfiles/files/deruwufupe.pdf
    • https://faresaldabbous.com/uploads/files/vumateminoregerazo.pdf
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/kafhrjissgnma17rj8b98f3ca4/tebaninubepu.pdf
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609815129805e---80552326558.pdf
    • http://bmcnx.com/userfiles/file/nudigelirababokome.pdf
    • http://pro.ovh.net/~tribuene/images/banque/file/pexaga.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d962.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD962 16792 bytes
font_01_sfnt_off0000f174.bin
0ba5f2aa8648f4f69b3cd5bdff75ffe20e0e8bd97dcaeee28193e96d841dcd21
pdf-font-stream PDF embedded font (sfnt) at offset 0xF174 17932 bytes
font_02_sfnt_off00012014.bin
49c457c9833189c110ad15ec463aa6bdd705818e95fb3fc8b2d7e25a07f0a42b
pdf-font-stream PDF embedded font (sfnt) at offset 0x12014 11104 bytes