Malicious PDF — malware analysis report

Static analysis result for SHA-256 a02310f0aa94ec6e…

MALICIOUS

PDF

68.5 KB Created: 2021-09-28 14:07:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c9990c6e241c5dd4d22f13aac97e06c5 SHA-1: 6e3aaea9f737eb3289897d823ff1646cd24f58fe SHA-256: a02310f0aa94ec6e6ff764499fbf67d65609ee8453dfe430d4aec178e27278e2
176 Risk Score

Malware Insights

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

This PDF exhibits characteristics of a phishing lure, using an image-based design with a clickable action to redirect users to external URLs. Multiple heuristics indicate it's part of a link farm hosted on compromised websites, suggesting an attempt to distribute malware or conduct phishing. The ClamAV detection and ML classifier strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://inwebjor.ru/uplcv?utm_term=test+velocidad+online+android PDF link annotation
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/27d84bc496cdedc04831b34b04740621/risomove.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16133fceea8451---xatupuga.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135e7c86c01a---40335639158.pdfIn PDF document text
    • http://hyunbulsa.org/~ewedd2/userfiles/file/11994689550.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/8314c825a1581fe540711f52d540f463/22891281477.pdfIn PDF document text
    • https://aznamaste.com/ckfinder/userfiles/files/pikunizorabumisibak.pdfIn PDF document text
    • https://www.jaegeraviation.com/ckfinder/userfiles/files/bafowewikis.pdfIn PDF document text
    • https://holcom-wd.com/webroot/img/files/muwosudovakov.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614b8acfb4b8b---43980037696.pdfIn PDF document text
    • http://altus.pl/userfiles/file/97718628885.pdfIn PDF document text
    • http://dalnoboy.net/data/filestorage/upload/files/gagaja.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16140319d6dd35---49824785860.pdfIn PDF document text
    • https://postelezmasivu-liberec.cz/ckfinder/userfiles/files/buvasedumupuporebusokegi.pdfIn PDF document text
    • http://vektor-bezpeki.com/userfiles/files/84407754800.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-9-24/20210924101044228308.pdfIn PDF document text
    • http://urs-certification.com/gais/image/file/leziwafulikira.pdfIn PDF document text
    • http://ssteelelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/4036351987.pdfIn PDF document text
    • http://lasfyy.com/uploadfile/file/20210922232644368.pdfIn PDF document text
    • http://villkasz.hu/editor_up/81445883747.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/ami6qq1sc74op8qgkvggsdr973/7553917416.pdfIn PDF document text
    • http://jj-metals.com/userfiles/file/2021090510185773499.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021092203124912279.pdfIn PDF document text
    • https://pilot-nav.socksnbows.com/ckfinder/userfiles/files/83650073622.pdfIn PDF document text
    • http://karlsbach.de/userfiles/files/79684647976.pdfIn PDF document text
    • http://ferien-in-zahren.de/images/file/35309863740.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_off0000b0b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0B2 14340 bytes
SHA-256: 9b56b6b449bd5a9acf48969b6de95b7c77ef7b6165ac7cac74de50e9ba778ea4
font_01_sfnt_off0000d4a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ecb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB8 10392 bytes
SHA-256: 77ee6fb6e0d3cef7303cc319f0eaf87b9f8acbcfefe829334cc48ca0e84ca2c8

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