Malicious PDF — malware analysis report

Static analysis result for SHA-256 b861c3a6e162d24d…

MALICIOUS

PDF

85.0 KB Created: 2021-06-30 04:53:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 434447812b6e6bf01e21a683f11e40de SHA-1: f27b2bc715091a9229c5a11adb1f23c45fe5e517 SHA-256: b861c3a6e162d24df2ceb37838c0b0583d748801410ad0a60815dcbd457af5d8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous external links, many pointing to compromised WordPress sites, suggesting it's designed to lead users to malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://coretry.ru/uplcv?utm_term=changing+bearings+on+a+skateboard
    • http://gardnersunited.com/clients/e/eb/eb3320446930dd457027df34457c622b/File/6527608021.pdf
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/ffeca0f6d6a63f4b7c6c35de02b30127/24069311444.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/nup80p6iov4liad12fonhjbq71/9668360375.pdf
    • https://zegabilisim.com/calisma2/files/uploads/vojiwixubepope.pdf
    • http://fernandopelosini.it/userfiles/files/fogixe.pdf
    • http://tlxzkj.com/uploads/file/210528053288.pdf
    • http://didopack.com/files/gibakugozikelibed.pdf
    • http://bisenzia.it/userfiles/files/jigusosiwaga.pdf
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/5b67106cb2d464a4f69a4042f39d5606/xubagofolaxetew.pdf
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/9b60c6be8afad814c53fd3600fddfc86/fowowiterig.pdf
    • http://sva-jeanroze.com/xmedia/file/29833103848.pdf
    • http://charivne.info/images/file/lepuzubuju.pdf
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6ab79493a---pavulagibimup.pdf
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb3a7b1e734---13468515766.pdf
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/16083345e644b1---66876882744.pdf
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/d4ag7iqs7kouf49f1petqnulv7/sexit.pdf
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c59c36bf06e---magozi.pdf
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609de81a07895---66919745033.pdf
    • http://sethhukumchandschool.com/userfiles/file/kukakogiropixijo.pdf
    • http://abnicum.com/files/file/sipawelanerufesegot.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/1ccaf89pivfg1krhh4lgds5s02/sunobuweresutisekimo.pdf
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d96192c9874---rulumiwakexirut.pdf
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087b3284f17e---zatef.pdf
    • http://barcabianca.eu/upload/file/31616630783.pdf
    • http://skincarebylaura.com/clients/862251/File/lepomanejifizaraz.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_off0000e921.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE921 16792 bytes
font_01_sfnt_off00010133.bin
4237cde13a2e2d133dd5759651c9bc98d1449b9680838310e0556fb6c20cd3a1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10133 17116 bytes
font_02_sfnt_off00012e1c.bin
e6c5e5f0f06d9fd41a4e3b43f737497a9e9f5dfeb19e6d7d96d5b3657f603f03
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E1C 10744 bytes