Malicious PDF — malware analysis report

Static analysis result for SHA-256 de95d3c568c24623…

MALICIOUS

PDF

73.3 KB Created: 2021-09-01 22:47:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 17993ae74a6f4aa7696dc24e78122bc5 SHA-1: a57f1d858ad0f8fc710e9b51614b315d3fe410e8 SHA-256: de95d3c568c24623466c9247045bad7eea97a3b15adbe2aee5e2ab9e224443eb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high probability of malicious intent. Heuristics indicate the presence of a link farm pointing to multiple external URLs, some hosted on compromised WordPress sites or disposable domains. While no scripts were extracted, the structure suggests it's designed to lure users to external sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://rajskiewakacje.pl/userfiles/file/34665723915.pdf
    • http://pappteam.hu/userfiles/file/81043794543.pdf
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca48f79216---20273481296.pdf
    • http://jgbt.us/pds/userfiles/files/26503485556.pdf
    • https://leise.ru/admin/ckfinder/userfiles/files/duvumufuk.pdf
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/c7118f946d5852dd9e3ed8899f8439de/1751691670.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611c9f2358f1a---vovojototawekuzipax.pdf
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/455b7a8e797139438284c73c036c9b90/64562710576.pdf
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/bc2939df2b9cc7d0ba149b4a0619ba19/pipetugojakeduwabuzavexub.pdf
    • https://gogreenonline.net/userfiles/image/fckeditor/file/47963983439.pdf
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607940ea80bd5---51710762333.pdf
    • http://tramtronbetong.com/uploads/userfiles/file/fararotozivovexogofafiv.pdf
    • https://ckmusicdesign.nluserfiles/file/bozizulugosefiwo.pdf
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/7ee2bd848b83e7c540be8a7a097ce6da/gituxuronitawoxo.pdf
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16087055ac29ed---71089857856.pdf
    • https://hogies.com/includes/template/uploads/file/jukux.pdf
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/a48fdcfc118a6807b2e488198d40c7e7/32379251274.pdf
    • http://hkalc.com/userfiles/gosolido.pdf
    • http://bsl-trans.ru/admin/ckfinder/userfiles/files/45821529885.pdf
    • https://chulintemple.org/CKEdit/upload/files/febiwukukifazusikelofo.pdf
    • http://rickgrisolia.com/userfiles/files/tefezutal.pdf
    • http://csc-021.com/userfiles/file/20210726195337_4ojazr.pdf
    • https://elnativocoffee.com/silver/upload/files/44985435608.pdf
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160941e4e89e34---vaxosogup.pdf
    • http://jakpaisanestate.com/images/upload/files/657677987.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=edgar+holmes+her+favorite+color+was+yellow+pdf
    • 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_off0000ba8c.bin
5b95f013e3f2429b258a540e1fd9612193686e97c64e79929bcaac1bc627937c
pdf-font-stream PDF embedded font (sfnt) at offset 0xBA8C 11212 bytes
font_01_sfnt_off0000d4aa.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD4AA 16792 bytes
font_02_sfnt_off0000ecbc.bin
00a728d79180b5172424f6cb3072449553015ea49a07efa837ea86f71e01ed24
pdf-font-stream PDF embedded font (sfnt) at offset 0xECBC 16764 bytes