Malicious PDF — malware analysis report

Static analysis result for SHA-256 783c0793bfa6bfc5…

MALICIOUS

PDF

80.1 KB Created: 2021-06-28 07:44:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3653e8230bf5ef6220f1e474e1adef62 SHA-1: 1f879e129bc12e1902cfa23a1902ae4bdad3711c SHA-256: 783c0793bfa6bfc59c250e2656f50568ea7765a9639aaf6440ada84d601544e6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting vulnerabilities or redirecting users to malicious sites. Several heuristics indicate the PDF is part of a link farm hosted on potentially compromised or disposable domains, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://kanalprofi.at/UserFiles/file/danukuvefafor.pdf
    • http://bestbuyfromindia.com/userfiles/file/50068905133.pdf
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091276865ada---fokebax.pdf
    • http://xn----8sbxab3abskk3a2j.xn--p1ai/media/file/12269881780.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/962a0rh8a7pd37eer5065vr7p0/giseseve.pdf
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/5f379183204ebdf21f47b46874637389/somiwonikaj.pdf
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/1ku3uihbe2vu2cpc14iakaq4hj/mesinovorejasoziril.pdf
    • https://planet-for-events.de/userfiles/file/dugunejuzej.pdf
    • http://chronocertif.com/userfiles/file/73914378366.pdf
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160721444c3f54---40258603661.pdf
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/9irs9uv9v5h0danbgtfal2h345/22444838778.pdf
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a28c0086ce8---7821189018.pdf
    • http://santiagoporter.com/js/ckfinder/core/connector/php/files/xekowijog.pdf
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/f391a0031737ad58808883a2dea504c6/35530036872.pdf
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/3e7cfe81416732d4d544f1a688dc31de/jodajifezolitefi.pdf
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e4cf511ad---fuzezenubanezowolofugi.pdf
    • http://interwork.sk/userfiles/file/zuvizivuji.pdf
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609af95cd76e8---kixugumezosowuvulesabepej.pdf
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/c1d26ac24cc76e43642cc5846f494bbc/dopimazitomefozajitepilof.pdf
    • https://anthonygillant.com/userfiles/file/vofifuridagalivimuzameri.pdf
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/b51c8970d1fa2ff45766e19ba7d816d3/ravobojusonan.pdf
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfdaab78d8---64018737763.pdf
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/739905af851dfa28bd617a4335f66685/begelejuzilijume.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=hybridization+of+carbon+atom+in+graphite
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/13ae2619d3b39382476421fee16ba17e/30515168535.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_off0000d448.bin
e72bc4b2fe04ade7cf0ff150ee3aaba15c807e39010ab5fc59ebb0d544393282
pdf-font-stream PDF embedded font (sfnt) at offset 0xD448 17216 bytes
font_01_sfnt_off00010143.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10143 16792 bytes
font_02_sfnt_off0001195a.bin
8ec4152b4d60be63dd9499b213298aa59d8c307b9fc3674d909e209836d59950
pdf-font-stream PDF embedded font (sfnt) at offset 0x1195A 11160 bytes