Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f99bceb0524ad0c…

MALICIOUS

PDF

93.5 KB Created: 2021-06-26 00:10:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: af2f26d09b7e4cc28b7a4f0bd1b72900 SHA-1: 0b6db5bd56ec4c3f4f6c9b06ff85ede3eeb6ed6e SHA-256: 7f99bceb0524ad0c292358ae5326be23c6804288a1d08f79d2d2e4b4fcea089b
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by ML classifiers and ClamAV. It contains numerous embedded URLs pointing to compromised WordPress sites and IP addresses, indicating a link farm designed to redirect users. The presence of these external links suggests an attempt to lead users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://nomylo.ru/uplcv?utm_term=round+bumps+on+back+of+tongue
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a9dd0c7f40f---lerijikuwaxanavozotanu.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/9866k1ns1nrc9q24ov0tloecj2/45494111465.pdf
    • http://aliceinformaticasrl.com/user/pages/seviraxokefakewawinagowi.pdf
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b66f9b4efda---mosorapavu.pdf
    • http://sacoorhealth.pt/site/upload/file/sasesado.pdf
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607169c05397f---todavas.pdf
    • https://vandolderskb.com/images/usr/55742762619.pdf
    • https://ndmoyun.com/calisma2/files/uploads/tejapivu.pdf
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/322dqsu4gtiosgv21kvgh8je7b/muvipaw.pdf
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0172ce5be3---74218400763.pdf
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084aebf48d62---wosodudefokagajajokugowas.pdf
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/d466300f023f3611ed174138d79052ea/wigejaso.pdf
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/bf0e3f0a2d1b0752e5485eb6230f9deb/roruwirovekakuwetalop.pdf
    • http://cdseoulps.com/uploadfile/fckeditor/file/pegeribezitimebaf.pdf
    • http://ahcxdq.com/uploads/file/150101374194.pdf
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff7c29efd9---8529589831.pdf
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/22nbpnu893lo3i9ad9355cvae2/4263291056.pdf
    • https://ssvacancy.com/ckfinder/userfiles/files/defazizowisomuvopareg.pdf
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc972a3f96f---xotaraxutuvadatival.pdf
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c28bb162604---34757830924.pdf
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ae740f0c3ea---mugunesimoze.pdf
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/bbd1b41c97858508ff5b689e262be23a/45546007129.pdf
    • https://amd-export.com/site/upload/file/64626771952.pdf
    • http://nationshield.ae/userfiles/files/10254958373.pdf
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae1691fe8f---fakixebaxodutubono.pdf
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/16072c2cc01aa8---bowazubizugaxitojebofuf.pdf
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/5a521c9dae00c0e4d61743d7b97520c3/82244698093.pdf
    • https://najlepsze-w-polsce.pl/uploads/89346522077.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_off00010b0d.bin
6a6e400db51cbf3d7a8787b4d1ca9ff3a3069ecfaa3eaaab809ba77cbc083509
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B0D 11104 bytes
font_01_sfnt_off0001249a.bin
e1f721e80b2256a40a1dec022d91a9c73b400e99c0b091cd4068df41c6d062c0
pdf-font-stream PDF embedded font (sfnt) at offset 0x1249A 16856 bytes
font_02_sfnt_off00015047.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15047 16792 bytes