Malicious PDF — malware analysis report

Static analysis result for SHA-256 405e20c2512ae1b7…

MALICIOUS

PDF

80.6 KB Created: 2021-09-01 08:33:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5c84d3461cc4b0881abb33f3623e0e72 SHA-1: ce5e5fcc810e298f2b338360683832a8762750a5 SHA-256: 405e20c2512ae1b78cdf3561e52f56d7792fb303d2bc6af403df83a9efcfde8b
184 Risk Score

Malware Insights

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

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. It includes multiple links to external websites, some of which point to compromised CMS uploads or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 http://chinalabware.net/d/files/buwujumafebikaw.pdf In PDF document text
    • http://test-immo.com/file/jokavegewapoxumivef.pdfIn PDF document text
    • http://veterinariacasettamattei.it/userfiles/files/geziwabovuj.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/maj3a6s5gdlel0u27t5audg2v2/wumosapoveme.pdfIn PDF document text
    • http://blessingsngo.in/userfiles/files/41100230387.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/f0bc31eed16a25f19067eea9d8705e76/povupokeratetekizegatuxe.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/a5c5c7f380bd3d9581520b8144f8f996/migenazud.pdfIn PDF document text
    • https://oferta.lt/i/File/sefufomavozizigolutopaw.pdfIn PDF document text
    • https://angel-juicer.com/FileData/ckfinder/files/20210806_6F10CDB494F506AF.pdfIn PDF document text
    • https://jdrum-music.com/uploads/ckfiles/files/lupujatiz.pdfIn PDF document text
    • https://tavio.ru/files/file/limenoburuvopip.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/35185843190.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/7603276771.pdfIn PDF document text
    • https://otartufo.com/ckfinder/tartufofiles/files/wakalutibobotane.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/9fv0d73pk33pnuvhlpv24bhl9c/dosewizisikekaso.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/2da0c9d0e5d62305c8e7e6fdb586e395/80729324642.pdfIn PDF document text
    • https://le27.fr/docs/file/10026031053.pdfIn PDF document text
    • http://157.230.241.115/image/upload/File/tijabegiparozef.pdfPDF link annotation
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c5f55287ce9---43283517121.pdfIn PDF document text
    • https://foodvellythailand.com/upload/files/togakabikadunevozidupa.pdfIn PDF document text
    • https://octvads.site/js/ckfinder/userfiles/files/zurarikupizatotexujinomel.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610f0e5853eeb---ratewavumakar.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080e75a151a4---97477445903.pdfIn PDF document text
    • https://usssecuritate.ro/userfiles/file/85754791038.pdfIn PDF document text
    • http://highlandhighclassof1962.com/clients/c/c3/c330a44b04b080977bf299ea430a317d/File/28961232808.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/7af8b9a22e34d49cda2d8d440032a3af/60551645271.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=leaders+are+madePDF link annotation
    • 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_off0000d71a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD71A 9904 bytes
SHA-256: d6d517247e5f3205b86df369621ecb76a32329c5bb87f7a8e89c089833c0da39
font_01_sfnt_off0000ece5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE5 18576 bytes
SHA-256: 2386ec7018de9e548668386caedeb3d52ef7df36d2c9260294aced44175fef1b
font_02_sfnt_off00011c19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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