Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc140e38f5e0e92d…

MALICIOUS

PDF

89.6 KB Created: 2021-07-02 12:26:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a836fa2772b935eca9658ace930d98ea SHA-1: 03d5440823996b8df226d9885040e51ea09d0a38 SHA-256: bc140e38f5e0e92dcce7932f5432eb5739a897d9bb595055c0f33fa1c79eb9d4
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The document body is unreadable, but the heuristics and URL analysis confirm the link farm attack pattern.

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://edusfera.pl/upload/file/moduferulo.pdf
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160caea14ac087---nisakaweperu.pdf
    • http://www.awakohchang.com/image/upload/File/ipuwukufozib.pdf
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/cg1gchnf416rbbrp1605qo6voh/zapokitobikasu.pdf
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/3b005b3bd3be0cda3e14ee6c779b99a8/wenuzademisuligevok.pdf
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b5d9a813c00---42184104141.pdf
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607ffda0d4367---97791287825.pdf
    • https://karinbentum.nl/uploads/file/85859726462.pdf
    • http://sl-light.ru/design/img/upload/file/48031529497.pdf
    • https://camgloberealtor.com/userfiles/file/34929636598.pdf
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/ega4qa8r6kne4bnrng8l2o1c23/35490783479.pdf
    • http://kompletucetnictvi.cz/files/file/50698039962.pdf
    • http://studiosantese.eu/userfiles/files/91819484546.pdf
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607657a035941---90142570970.pdf
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8979c56279---75659424810.pdf
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/0313e2603de8f95fe1eff15b15ac3054/15163854439.pdf
    • http://adabaskimerkezi.com/upload/file/71077409621.pdf
    • https://alpinashop.bg/files/72124400778.pdf
    • http://zkojicin.cz/userfiles/file/pupozelejafebavi.pdf
    • https://atcotourismtravel.com/userfiles/file/jejigedugelejuta.pdf
    • http://congtyvima.com/images/Download/8099042931.pdf
    • http://allseasonsart.com/uploads/fck_uploads/file/jukasubimavijirasamixuvim.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=how+long+do+warnings+stay+on+your+driving+record
    • 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_off0000f931.bin
50c2fedfebc2a98d48e579ceedafed15bf6bbacab2c06a7c7a7d14b15ed7e11b
pdf-font-stream PDF embedded font (sfnt) at offset 0xF931 17736 bytes
font_01_sfnt_off000127d9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x127D9 16792 bytes
font_02_sfnt_off00013ff0.bin
f333464b8754c8c1b1f3b4bc898ab55370ee9fbe2879dd0d205af7b63902eaa8
pdf-font-stream PDF embedded font (sfnt) at offset 0x13FF0 10900 bytes