Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b80503daebebb91…

MALICIOUS

PDF

74.5 KB Created: 2021-09-21 01:06:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: e870e6fb93e2c2331034bc2093c6f43e SHA-1: db7267a62a3a6042b454bf2c9c3ecdfaca5f5c27 SHA-256: 8b80503daebebb91ad2105baf01f412eb78cc3471b2a1df7cf79f18dfdd574e8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. It also features a link farm pointing to multiple distinct hosts, including compromised WordPress upload directories, suggesting an attempt to obscure the final destination or leverage legitimate infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://laborke.ru/uplcv?utm_term=stick+squad+sniper+battlegrounds+apk PDF link annotation
    • http://studiotecnicolamanna.com/userfiles/files/pokez.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613333da65ab4---zonog.pdfIn PDF document text
    • http://intrinhgia.com/admin/webroot/upload/image/files/bedowinafasugofafizaxi.pdfIn PDF document text
    • https://castilloexterior.org/ckfinder/userfiles/files/96586701432.pdfIn PDF document text
    • http://maduraicaterers.com/app/webroot/js/ckfinder/userfiles/files/kosejeduliz.pdfIn PDF document text
    • http://zatuchlina.cz/upload/file/7653620036.pdfIn PDF document text
    • http://drironcat.com/images/file/gutokefixixomovolujifeka.pdfIn PDF document text
    • http://land89.com/ckupload/files/59962485415.pdfIn PDF document text
    • https://transport.frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/deluwugudoperogusa.pdfIn PDF document text
    • http://p-itos.net/admin/userfile/image/file/38137932873.pdfIn PDF document text
    • https://beauty-full.ru/uploads/files/lubexufesi.pdfIn PDF document text
    • http://mebelhotel.ru/userfiles/files/16658535278.pdfIn PDF document text
    • http://www.civilhospitalpalampur.in/img/uploads/files/90864487398.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/16143bdfa59540---fizidusop.pdfIn PDF document text
    • https://vendax.ro/files/file/23988868123.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/ee9807418e6ff1ede0ca40866cdc99e9/zosedewokuz.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/6e01a75ab6f3f1e9423ea0a13330ad08/78904710.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b8ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d0ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0FF 18888 bytes
SHA-256: 572cdf8954e8a2f0894189d0e6ccbade3d9be9ef542220343158c4867b20540b
font_02_sfnt_off000102df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102DF 11244 bytes
SHA-256: c0e568e7b4af715e9ffdc0e577acfa66a8762d6313e902a31fc55a89191c8b63