Malicious PDF — malware analysis report

Static analysis result for SHA-256 6df12289348cb436…

MALICIOUS

PDF

84.8 KB Created: 2021-07-02 21:16:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ae3d072f31dda57c20c79772afb17154 SHA-1: 3b6b11773a4c6d07829a59cf7af74f541f14e258 SHA-256: 6df12289348cb43643dd4cb93296f716602a6d0296de2bb344faa7f68d18785e
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress sites and potentially disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs, while some are marked benign, are part of a larger pattern of redirection to unknown or potentially malicious domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/4b96edc43273d7e17346566b60998c3e/komibopadup.pdf
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a6c22856b78---40150627883.pdf
    • http://scpt.it/userfiles/files/61979461951.pdf
    • http://trustarshida.co/cache/fck_files/file/mirudikinenevivamabaw.pdf
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d6114dedd---zazozatiralufab.pdf
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160ceba4e96242---buzote.pdf
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/ma8fsesttfq6ir563evie9p9p3/zijakuriz.pdf
    • https://yar-net.ru/userfiles/file/8933316967.pdf
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/d2ed1725dea821c312ac2b5fa1305d89/dupojataropajab.pdf
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609bdf9656bf7---zabepuxaginir.pdf
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d51c1051961---sabevimedaw.pdf
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce7ef4e6c8---nabumujenifojosa.pdf
    • http://myphamlulanjina.com/upload/files/tidujuvokaxogak.pdf
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cd36006afbc---devumi.pdf
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c1b9690b9f0---metexopakigowiz.pdf
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/6a5d6575d3ff4d9e0d4a7747710b8d05/32277190274.pdf
    • http://shiksha24.com/userfiles/files/gizanomaxuzamuziko.pdf
    • http://mtsskzy.com/userfiles/file/21254638560.pdf
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b06c2204cff---gaxebuzem.pdf
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/cpekn2lrte96d3gad3tiq6u5r1/60771245398.pdf
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160bf698dc80e5---81899919696.pdf
    • https://eminencesolutions.in/resources/userfiles/file/77448111100.pdf
    • https://veterinarycarefoundation.org/userfiles/file/66759973112.pdf
    • https://adsbudget.net/userfiles/file/35771421378.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=questions+and+answers+games+for+girls
    • 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_off0000e825.bin
5cb87f9051444ccb896fdde00d817e4d6814e8389b14e3b9aa6a0368e974f259		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE825 10944 bytes
font_01_sfnt_off0001017c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1017C 16792 bytes
font_02_sfnt_off0001198e.bin
18d1fe3ac85702f5ddc9ac9e544e07482ab0179de4f7026d9f30a4306719afb9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1198E 17060 bytes

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