Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dc023a4a7a4cc4b…

MALICIOUS

PDF

80.4 KB Created: 2021-07-07 07:49:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e36f8cc9b02b7a1c7430ba74ef56d3d5 SHA-1: f9c80b28d718755a3bfc577ec51317bdb4d02334 SHA-256: 3dc023a4a7a4cc4b8427ba81625bebc6d45d2396dadec90738fe69ad9c0b3c87
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple URLs pointing to compromised WordPress sites, which in turn host other PDF files. This suggests a link farm designed to obscure the ultimate destination, likely a phishing page or malware download. The ClamAV detection and ML classifier 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://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/f0b4c093f438b89dfc8bc4cffcffefd2/fozafivovi.pdf
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/16086e02bed44a---lowosumeridedikev.pdf
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a592f32826f---xokijesupekevamifo.pdf
    • http://angelcabrera.com/FCKfiles/file/60383176774.pdf
    • http://nexxosrealty.com/userfiles/files/timapam.pdf
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a409326c1d9---kamemaxoxegakub.pdf
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607967a2a005c---dulab.pdf
    • http://antiochhighclassof70.com/clients/4/4a/4a4d67c83f6236388cbe8d22d68d4f91/File/sezusojetusevipapipij.pdf
    • http://xn--aknmedikal-yub.com/uploads/file/kewasinijinipodidoxuz.pdf
    • http://kolesnikov.pro/ckfinder/userfiles/files/zarorek.pdf
    • https://abe-rdc.com/userfiles/file/sazabelodapenilepa.pdf
    • https://www.webplease.it/wp-content/plugins/super-forms/uploads/php/files/jojri5lpj949hevd1pjstlqv8m/5948435168.pdf
    • http://jestbogiem.pl/app/webroot/uploads/file/kisivupul.pdf
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/09f793292e7053f5bf81d1a81784df46/96084397696.pdf
    • https://doanhnghiepvietnam.org/img_duhoc/files/sexugapi.pdf
    • https://bayihoki99.com/contents//files/dujaxepajikotar.pdf
    • https://daaeportrett.no/upload/file/lulexejudotewoxawaribuzap.pdf
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160846d40dc47a---temojevifelaloditufuwav.pdf
    • http://stauarchitetti.eu/userfiles/files/bowuririj.pdf
    • http://maasmartcity.com/userfiles/file/dabenumomev.pdf
    • https://apskarota.org/userfiles/file/89846503467.pdf
    • https://247hvac.ca/fabulous1/uploads/files/gefitokujalenojivo.pdf
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/5559b501141efce8a4b5e324794b7d90/48598713666.pdf
    • http://serextion2006.com/js/upload/files/15939950897.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=chemical+reaction+engineering+third+edition+solution
    • 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_off0000caf9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCAF9 16792 bytes
font_01_sfnt_off0000e30b.bin
b5a26e8f0ce11777e61873d0a6d2d1a0b34118c3e688ed434a28ac842d287e38
pdf-font-stream PDF embedded font (sfnt) at offset 0xE30B 20832 bytes
font_02_sfnt_off00011b0d.bin
63f7cfa42af8885f8844b95525d1bfd9f7ff814a779a32722be9fa94284344e3
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B0D 10948 bytes