Malicious PDF — malware analysis report

Static analysis result for SHA-256 d34f896521df0a06…

MALICIOUS

PDF

84.9 KB Created: 2021-10-05 17:29:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 08ca329f8a0cc91cf039aef09e558b5b SHA-1: a42dc94828575cb6e0b142d4bfe3ceea4f2f3135 SHA-256: d34f896521df0a0679e24aff99b38877f13d647a2e173aff42d1de003ba19e76
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Embedded JavaScript and numerous external URIs, many pointing to compromised CMS uploads or disposable hosting, suggest the document is designed to redirect users to malicious sites. The presence of embedded JavaScript (T1059.007) and the nature of the links strongly indicate a phishing or malware delivery attempt, aligning with Spearphishing Attachment (T1566.001).

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://irlanc.ru/uplcv?utm_term=pancakes+for+one+no+egg PDF link annotation
    • http://morethancars.nl/uploads/edytor/file/9075095938.pdfIn PDF document text
    • https://isosklo.cz/uploads/9691399676.pdfIn PDF document text
    • https://mmeasar.com/mmeasarfiles/file/16821293664.pdfIn PDF document text
    • http://2990592.ru/ckfinder/userfiles/files/22422841314.pdfIn PDF document text
    • http://cpbnatation.fr/fckeditor/userfiles/file/mirakexojanaxik.pdfIn PDF document text
    • http://halaljones.com/uploads/files/budigifaroxalofamuredumej.pdfIn PDF document text
    • https://austdoorcaocap.com/upload/files/14277247973.pdfIn PDF document text
    • https://g-stampo.com/pics/pages/file/lilavufuj.pdfIn PDF document text
    • http://aibasylhet.edu.bd/app/webroot/ckfinder/userfiles/files/kuseretuweji.pdfIn PDF document text
    • http://pngroup.pl/ckfinder/userfiles/files/79757209576.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/4924991687.pdfIn PDF document text
    • https://sharjahcements.com/images/bulk_images/files/21237797562.pdfIn PDF document text
    • http://dedanskecasinoer.dk/userfiles/file/rupowexofijubifutagizapap.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/161538efc7fd06---13303000721.pdfIn PDF document text
    • http://design-klasse.de/ckfinder/userfiles/files/18841875886.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161523d95df099---47881351015.pdfIn PDF document text
    • http://superfishinglewood.com/uploads/files/71697054770.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/fafezifiwex.pdfIn PDF document text
    • http://lahma.pl/_u/userfiles/file/ketofegunizeluluw.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/45712665688.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/e25f426345cd20913edb127ffc7951b2/kalof.pdfIn PDF document text
    • http://primebrokeragetx.com/ckfinder/userfiles/files/80674455244.pdfIn PDF document text
    • http://elezioni2014.gds.it/userfiles/file/gelokovixede.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_off0000e2f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F5 10368 bytes
SHA-256: b63ef20d85a05ad5cf34a4c7032da6b0f958f6af6d32e25aa534ff1a2b208f43
font_01_sfnt_off0000fa8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA8C 20040 bytes
SHA-256: 5c662e1661a1ad5842af7301b1b284f04fad67af502eaae8a9db8b09c6da3e9e
font_02_sfnt_off00012e50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1