Malicious PDF — malware analysis report

Static analysis result for SHA-256 646c332e55de56dc…

MALICIOUS

PDF

86.1 KB Created: 2021-08-16 23:01:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ea44fbd5d222ffb8979abb18cafc9eff SHA-1: 2a26d936a1ba4370505a82197e3b06d1f0ffee82 SHA-256: 646c332e55de56dc0226cf44bd6f5f2b414d0b8f93b619916bdfa076468ae2bd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to obscure the true destination. The presence of embedded JavaScript, flagged by heuristics, suggests potential for malicious actions beyond simple redirection. ClamAV detection and ML classification further support its malicious nature, likely as a phishing or malware delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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 http://csptech.net/admin/userfiles/file/29842132842.pdf In PDF document text
    • http://www.park-seversk.ru/other/js/ckfinder/userfiles/files/dazoguzutufizu.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/67301681224.pdfIn PDF document text
    • http://sartor.ru/upload/files/tevifazikirilegomuvelu.pdfIn PDF document text
    • https://arch.ua/ckfinder/userfiles/files/gofuwamerabikarexisogewuj.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3d2dd143fa---lapudepapana.pdfIn PDF document text
    • https://conexkarvan.com/cache/fck_files/file/wenuzipopi.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/36aaf6b3a96e49b1cfdb4862369587af/vinukubidixemufuw.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/xanemowazevapopida.pdfIn PDF document text
    • http://silverleafspa.ca/clients/10619/File/pekifotafubutubekanaxerup.pdfIn PDF document text
    • https://lasvegasrebath.com/wp-content/plugins/super-forms/uploads/php/files/14386f2091c2afeced158bcfa6516cc6/1176778185.pdfIn PDF document text
    • http://nhsclassof77.com/clients/c/ca/caa0b9827732345dad94809623212052/File/pezifutudezikaxul.pdfIn PDF document text
    • http://marinda.ru/pics/images/file/60128485543.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/da673009669952a70534eedba0466983/nujuj.pdfIn PDF document text
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/95914131093.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16113c6efa9aa6---59283677061.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/1d8dbbc96daa2fbd0101d63cb3fd0c67/82117231789.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609d229f17aca---58004241194.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b378389aa74---76803280329.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160981d0106b53---xegumu.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/d8cf3da0beec96862e1108398edc1f11/kapifevobimeditipinos.pdfIn PDF document text
    • https://stockbauer.hu/uploads/file/dagabajo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=beyblade+burst+rivals+mod+apk+%28unlimited+money+and+gems+2020%29PDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/1d33e0f7f8cc9ccd7e720791d57506d5/23083474763.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_off0000e80c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE80C 11696 bytes
SHA-256: 623882f37d24b6ac46a7487fc5cecd1449a521afe73d83ebd4c9268065083798
font_01_sfnt_off000103b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B2 17644 bytes
SHA-256: 1fcde8f932c36e9b8f5f438e3ec2e494b847014d1e5030a9d23e4e1a3bd49a60
font_02_sfnt_off0001315d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1315D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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