Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb45b92da73ab40c…

MALICIOUS

PDF

68.1 KB Created: 2021-09-20 19:26:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c5ac5c28b5d853d3ab29f1616a0e91ec SHA-1: bab085719ffa5714c46fd27dd9f3dea2f6936481 SHA-256: bb45b92da73ab40c99b74f6087046bcf5d101d6c8f035d2a6f66b9d723cc2e56
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its image-only nature and embedded clickable links, a common tactic to deceive users. The numerous external URLs, many hosted on potentially disposable domains or compromised CMS uploads, suggest an attempt to distribute malicious content or conduct phishing. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate malicious intent, likely leading to a second-stage download or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9851

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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.
  • 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://coretry.ru/uplcv?utm_term=gta+3+cheat+codes+all PDF link annotation
    • https://dnmpaint.com/sdcc/images/file/28307324601.pdfIn PDF document text
    • https://queensflower.nl/clientfiles/jasalotazofuvabed.pdfIn PDF document text
    • http://ibrahimalsada.com/pics/file/23126033699.pdfIn PDF document text
    • https://familienbilstrup.dk/userfiles/file/52174701149.pdfIn PDF document text
    • http://vdi.vn/userfiles/file/86696005751.pdfIn PDF document text
    • http://ihdbd.org/upload/files/83684661809.pdfIn PDF document text
    • https://www.albriug.com/static/editor/ckeditor/ckfinder/upfile/files/34190358707.pdfIn PDF document text
    • https://bomando.bomsolar.com/uploadfiles/files/varikarure.pdfIn PDF document text
    • https://unosms.us/userfiles/file/60275006300.pdfIn PDF document text
    • http://union.travel/ckfinder/userfiles/files/69765293154.pdfIn PDF document text
    • http://01host.ru/userfiles/files/61424133638.pdfIn PDF document text
    • http://www.slenderclub.cz/ckfinder/userfiles/files/10132591089.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1613a021782787---98128799530.pdfIn PDF document text
    • http://xyr59.com/filespath/files/20210907091418.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613432b77427e---38596601272.pdfIn PDF document text
    • https://northcoteplaza.com/userfiles/file/tagod.pdfIn PDF document text
    • http://6nergy.fr/6nergy/sites/default/user/file/kiloxifosuj.pdfIn PDF document text
    • http://2990592.ru/ckfinder/userfiles/files/51403671974.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/96773134215.pdfIn PDF document text
    • https://cvzona.lt/resources/img/files/28464362123.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16146a1e171851---remibanabusedukofiva.pdfIn PDF document text
    • http://chugguwang.com/files/fckeditor/file/91712187345.pdfIn PDF document text
    • https://holyfamilyhospitals.com/ckfinder/userfiles/files/gotedofosemunipezijoram.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/81598500573.pdfIn PDF document text
    • http://ubestsports.com/imager/files/20210911084248.pdfIn PDF document text
    • http://www.astmalek.cz/obrazky/file/98717057416.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_off0000b0e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0E5 10380 bytes
SHA-256: ea9c3d87c12516ef7e42806321bfb4897e1ea289ac0b9d5516787e9e83fb2f57
font_01_sfnt_off0000c89c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC89C 13992 bytes
SHA-256: 0ca958b15182fe031e2976b1392fe52fd2e985c3616c75b16af5a549569e2115
font_02_sfnt_off0000eb14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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