Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6d1c728aea22248…

MALICIOUS

PDF

115.9 KB Created: 2021-06-30 11:27:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fbbb6b5788da97a8e0688e5359d03f6e SHA-1: bd9b5469ad3ed42d1b248b8bddaec28f5d12a6ad SHA-256: b6d1c728aea22248a6c6984be747ded9d648fc06041d896befa32a38cd331d04
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting an attempt to lure users to malicious content. While no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a phishing or redirection campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • 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.
  • 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://caratow.nl/userfiles/file/87871575404.pdf
    • http://amexeuro.com/an3_Uploads/file/sapilodaxoluravudela.pdf
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a97dad329a6---gugifikujifojokan.pdf
    • https://thietbivesinhanhhuy.com/asset/files/sepaz.pdf
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/38cf0f6605426681143092b58a7a47ea/xidumofefimilesubu.pdf
    • https://gulf-rope.com/images/bulk_images/files/10960629885.pdf
    • https://gastriklandsbf.se/UserFiles/files/nonizarobujoxojelosegik.pdf
    • http://thecreditcrisis.net/clients/73966/File/69537359657.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd2c865838---jubus.pdf
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086265caf237---kajore.pdf
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/021dd0325f748566ebd9714b2dc9c6f2/rorixiwaxis.pdf
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a930f26b97a---5759955372.pdf
    • http://dnepropress.net/files/file/fenodesukov.pdf
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/3a1f6204146afc32be362d9fc5cc61d8/46311007518.pdf
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0e7656d53---turemufojosonamibivadigod.pdf
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160712531cf8eb---21723059662.pdf
    • http://rittenhousereunion.com/clients/a/ad/ad7d26974070b67854a29702aed78614/File/kaxasupo.pdf
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1609d217c7efd6---13330308998.pdf
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1ade3b337c---toteforegam.pdf
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3ad3e3fa886a449f15f29866824cf801/wojuvifanoxutibamolulosos.pdf
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16087061c6e445---fosoj.pdf
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/7fa5804cf19addea64906419ce8f5a90/82433897757.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=english+plus+4+student%27s+book+answer+key
    • 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_off0001545d.bin
7efc06a45a61c81d7123b21e99feb79595eea155d2b5bda083c7255d668d62d9
pdf-font-stream PDF embedded font (sfnt) at offset 0x1545D 22932 bytes
font_01_sfnt_off00018e1b.bin
5f18cce8d2a69935d0d51e806e3b4f3b789b60a087ed0177e898fa1557172bae
pdf-font-stream PDF embedded font (sfnt) at offset 0x18E1B 11296 bytes
font_02_sfnt_off0001a84f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1A84F 16792 bytes