Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bb90be446262fd8…

MALICIOUS

PDF

78.4 KB Created: 2021-06-26 00:04:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b810f112a90190fbb30f46a271ec5eb4 SHA-1: b37327aef056b48700bded4f994c57d8978883da SHA-256: 9bb90be446262fd8d5be44dff955d779291aa7fc5d4424da1211e87c949ace3d
156 Risk Score

Malware Insights

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

The PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm designed to obscure the true destination. The document body is heavily obfuscated and unreadable, suggesting an attempt to hide its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://latexindia.com/userfiles/file/begixuvozizetenosejevife.pdf
    • https://infrastone.com/userfiles/files/wofufenimanilagoxo.pdf
    • http://movietek.vn/hinh-anh/files/61264997275.pdf
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607449e2d1c17---vuzakazi.pdf
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160748b5e3a54e---49752710142.pdf
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160bd91ec10d5c---15696838654.pdf
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/2k7d6e8mnpla1etb0o1d0pn104/95952932164.pdf
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0968b1b54d---tapaluxitebuvabug.pdf
    • http://aexpress.lv/index/images/up/file/51456106937.pdf
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/avp7np3rjnr2arbitll9l7v7h6/37840711232.pdf
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c574982961b---modiz.pdf
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/a695ad78db45d1b4141de9244dedab07/poranikuzekafesezuguvajuk.pdf
    • https://prcomponents.com/ckfinder/userfiles/files/8657964621.pdf
    • https://pametnidom.hr/pametne_kuce/userfiles/file/kaxaw.pdf
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160aec496a5173---30858346816.pdf
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/870889b4ace589e2aac7ee53db43bdec/35215153752.pdf
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/607a3e7259d322eea6a84229ea67cc5f/potesarobiluzemebolakive.pdf
    • https://mvpartners.be/images/uploadedimages/file/nipararomazorigeko.pdf
    • https://www.djluk.co.uk/wp-content/plugins/super-forms/uploads/php/files/l2vmgiotil5jgtd4a958r34vng/wagorejav.pdf
    • http://amon-syotengai.com/userfiles/file/8842572443.pdf
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/hqvc1k97s9acuin651bgs4gljn/84368924147.pdf
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/7f307623d76177809bdda19ea37ff756/luloxana.pdf
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/147000c06d8438d04ef7aa2c48c7bafb/16727577290.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=wh+words+questions+and+answers
    • 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_off0000cecc.bin
4126e322fbf9357e67ce2f8c0b04ce2b513193a9ea43413c529842b313344f04
pdf-font-stream PDF embedded font (sfnt) at offset 0xCECC 17508 bytes
font_01_sfnt_off0000fc32.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC32 16792 bytes
font_02_sfnt_off00011449.bin
2086d85f4822e731f566da11c7150ff060b71fd963b58d61a1660f08b3f1fe57
pdf-font-stream PDF embedded font (sfnt) at offset 0x11449 10624 bytes