Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9a27a884b96e39c…

MALICIOUS

PDF

70.3 KB Created: 2021-09-13 04:22:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: 2d1f7d776a0215ffaaeeb7770b3389f9 SHA-1: bc3f4ef0edef7f0576d24cbf734117bdc1fc099a SHA-256: f9a27a884b96e39cad99c6ff0f59664c6028c17547557df80d44f72de05d4f05
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. The ML classifier and ClamAV detection further support the malicious nature of the file, likely serving as a lure for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8257

Heuristics 5

  • 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
  • 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://carneslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/67872388494.pdf In PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/zipafononugamalakagiziku.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/nebobenefox.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161320883617c7---xetegovejiv.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/11121425193.pdfIn PDF document text
    • https://faktxeber.ru/resimler/files/44252313664.pdfIn PDF document text
    • https://ls-machinery.com/uploadpic/files/202109121220471003.pdfIn PDF document text
    • https://kuepancong.com/contents/files/3379914109.pdfIn PDF document text
    • http://vipnjl.com/userfiles/files/73066182642.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/dcjm9a9rtfulgmohh0rvak254c/78532560671.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/5ade7c7d30542c4128c74e84dc7eb8b2/32265109467.pdfIn PDF document text
    • http://studioassociatoemc.com/userfiles/files/sorusarijebev.pdfIn PDF document text
    • https://xn--72ca1bzcdf9cg5df4n5a8cei.com/userfiles/files/32078608009.pdfIn PDF document text
    • http://aolisenjiancai.com/data/files/28214041514.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/r1aq8aiqs6ji8nfjasm7rpcbfl/2051274419.pdfIn PDF document text
    • https://luiginoiobbi.com/userfiles/file/55279594541.pdfIn PDF document text
    • http://spy-military-labs.com/userfiles/file/69253961247.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bfd96bb951---9992123591.pdfIn PDF document text
    • https://netpage.info/userfiles/file/61435484232.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16135120a65aba---93384944142.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/93714363095.pdfIn PDF document text
    • http://baocaosuhoatoc.com/luutru/files/54582382374.pdfIn PDF document text
    • https://djecijagarderoba.me/userfiles/file/safivudedumofozaluza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=mobileiron+web+work+androidPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d31a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD31A 17768 bytes
SHA-256: b558558c33de010dfa823880588081befca6b4bebacecb0b3cb22800d6c32b31
font_01_sfnt_off0001016c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1016C 10288 bytes
SHA-256: 89ed97a73663f3464f407f36fdfe5d55cba77ffface05be4d4826d9de9323c27

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