Malicious PDF — malware analysis report

Static analysis result for SHA-256 6acdcd40128f2af9…

MALICIOUS

PDF

84.7 KB Created: 2021-06-27 01:43:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a420943b37d24fbbe49c6240ffbbfaae SHA-1: 81d597d12f27f3c115502f4167f5d784d4439f48 SHA-256: 6acdcd40128f2af959ce224dbaf8c8b2bcb35c21521016ba11ef36986330cebc
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/8286abeaa5e31478a24d7f7fd9d712a2/mulobo.pdf
    • http://infrabud.eu/fckpliki/file/josogekixo.pdf
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/977rf1u4u82cv426h62lg5uc73/55663926062.pdf
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/e5ogn27eppkgl4nc37fv34vu42/24375494506.pdf
    • https://thepainter.asia/upload/files/1335314469.pdf
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/b84da07c5fb6f5933c4e31884a626441/75120704678.pdf
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/6ghvrjle5ttqdk7s5ujtf9msah/xeniruzubadukodutokufovu.pdf
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/5o90n1hgsne9t25r5ujk0nfdkb/tiramuwajixugu.pdf
    • http://ciaooo.ru/uploades/userfiles/file/75376165311.pdf
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/0dcc9f91fd31b468a845591893548b54/79142163229.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/epsamd3v7vicaec8gogfe08d2h/49947426437.pdf
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d09d055cb---51269574611.pdf
    • http://mega-gold.com/userfiles/files/92908585800.pdf
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/3hts3gi7871r589uqf388ctuum/38553629753.pdf
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/16072fe1122c0c---30230179819.pdf
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/7f431811e0d878779ed7f46e0f7aeec2/91890120735.pdf
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/oclkn44nggmdd9o1mhm8aevha4/vobuligepebinepaga.pdf
    • https://topclassgreenery.nl/images/file/safidaz.pdf
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b2b8de98126---fonulivoliselatab.pdf
    • http://caydinhlang.net/userfiles/image/file/filakavozapeduwakerube.pdf
    • http://kozelskadm.ru/files/uploads/files/kumetujabitebiz.pdf
    • https://afayl.com/userfiles/file/voranamulajusepajuduxo.pdf
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be81b285bf6---23513117105.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=what+is+the+difference+between+site+and+sight
    • 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_off0000e885.bin
7475c37a6ac49ced6858ba20c5fe0bc81bf5c7a9c83664dd37072ccfee92fce9
pdf-font-stream PDF embedded font (sfnt) at offset 0xE885 10808 bytes
font_01_sfnt_off0001013a.bin
c9a5df84b79d0dd458dcb1da13a0c34ecb72f597d68d1256f85a82bf1b79bb96
pdf-font-stream PDF embedded font (sfnt) at offset 0x1013A 16860 bytes
font_02_sfnt_off00012d10.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D10 16792 bytes