Malicious PDF — malware analysis report

Static analysis result for SHA-256 a64ff71cda3e27ab…

MALICIOUS

PDF

81.3 KB Created: 2021-09-21 23:25:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c7ffcccf7a52987630c90dd296d6f2c3 SHA-1: fb87293c2dfc08e501e8ab172fe8e77b5ecf4a13 SHA-256: a64ff71cda3e27ab031831a89d46a23344c55d047f0b83e76b22d67f298d2bfc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to multiple domains, some of which are hosted on compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of numerous links suggests an attempt to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://artpolinakuzina.ru/pict/file/wisewiweka.pdf
    • http://insei.eu/userfiles/files/fovubinupuxa.pdf
    • http://directopinion.biz/uploads/FCK_files/file/momovemijewijufeso.pdf
    • http://thepokewave.com/uploads/files/12568024011.pdf
    • https://takarasushimn.com/userfiles/files/lelapabotojuxot.pdf
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613032745e219---73044563113.pdf
    • http://camelliafb.com/uploads/files/202109132046297018.pdf
    • https://habrit.tw/ckfinder/userfiles/files/barevesaje.pdf
    • https://sdhouse.info/ckfinder/userfiles/files/92264253139.pdf
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/a5eb438cd03143c476a80420c82bc8b8/malubemegokavujumik.pdf
    • http://designklasse.de/ckfinder/userfiles/files/26842714232.pdf
    • http://robwalker.net/fckupload/file/38453361516.pdf
    • https://demo-calson.garment-pro.com/ckfinder/userfiles/files/76654762476.pdf
    • https://tunhuaduytan.com/upload/userfiles/files/gewineroda.pdf
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614176d7c6fba---64288186413.pdf
    • http://goldmustang.com/files/files/gujisekijosare.pdf
    • http://familiegravesen.dk/userfiles/file/96404095445.pdf
    • http://aolisenjiancai.com/data/files/libotenorigararabivu.pdf
    • https://xn--nmqu14inmf.com/upload/files/28518924686.pdf
    • http://surtek.biz/image/files/20150326_163730.pdf
    • http://leton.pl/userfiles/file/30088410283.pdf
    • http://autokolcsonzoszolnok.hu/admin/fck_upload/file/72002458489.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=private+instagram+posts
    • 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_off0000dab7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB7 16792 bytes
font_01_sfnt_off0000f2ce.bin
5739cf6359d35080d364d28bdea2a9f9ad77fa0664e3a70200b75c39110ca7bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2CE 10616 bytes
font_02_sfnt_off00010b14.bin
b6c394bbde5c4b366c603ba574018ffda519daa78ce31c4bda5d9558d343affc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B14 17572 bytes

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