Malicious PDF — malware analysis report

Static analysis result for SHA-256 4793941ba6f237a6…

MALICIOUS

PDF

92.5 KB Created: 2021-08-13 15:56:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5fd2820c4aaf637c96265ac243e12df2 SHA-1: 1f6df782832d94f4e43e9432b25ceeac1f68a9b2 SHA-256: 4793941ba6f237a6362e01db3a596c373087676b8d64f111cc875cb441c2a721
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The heuristics indicate it is part of a link farm hosted on compromised WordPress sites, suggesting an attempt to distribute phishing or malware. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature, likely serving as a lure for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/da8bd493bff10f1c70641bbd595aa641/88001702527.pdf In PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/f3b9c0561719224f95f30f63b7403f93/86157931516.pdfIn PDF document text
    • http://mebelhotel.ru/userfiles/files/bopipebuvu.pdfIn PDF document text
    • https://kawanmto.net/contents//files/89811204560.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/dj4od1b2rh1msclgtocdi28k96/dumeninolugoxewupit.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/97d96661f130413a9f97969dc3ffb151/pejoromuf.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4a27184285---67899395824.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/xunulafabuvejatejujegez.pdfIn PDF document text
    • http://tele-fonika.pl/upload/file/putotawon.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/kfer77da15m5l51018bmgoro3d/77428002662.pdfIn PDF document text
    • http://newgrids.com/userfiles/file/98032940186.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/i6felbdtnktjsfdbptfhqgtbh2/sitoneturinegogojel.pdfIn PDF document text
    • http://cuborh.com/natelinhanew/js/ckfinder/userfiles/files/ludobegatepelufamikidasu.pdfIn PDF document text
    • https://onderdurdu.com/upload/ckfinder/files/tezusib.pdfIn PDF document text
    • http://master-sign.ru/ckfinder/userfiles/files/66170579036.pdfIn PDF document text
    • https://newtop-eg.com/userfiles/file/gigimemawawifugib.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b78b046e04---zakozukiva.pdfIn PDF document text
    • https://ksboutlet.com/file/files/rowoxixojuragu.pdfIn PDF document text
    • http://sumterhigh89.com/clients/863574/File/fadibuzeximi.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bbaa7b20a47---mepivizetelumuwa.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/vanaxekovivuxuw.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/58069779069.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/7e1e95911d14f327a9a0d27748db142d/97585768136.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=employment+application+letter+sample+pdfPDF link annotation
    • 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_off0001057b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1057B 10880 bytes
SHA-256: 39792ec58697b4cc0f2da6a77cc6eb7c8593862c680ee52a9d63d369009f54d7
font_01_sfnt_off00011e98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E98 16820 bytes
SHA-256: ba273fc740b1967e68fd5af11f065754535d2ac92195e9a01e1f40711b3e8209
font_02_sfnt_off00014a94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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