Malicious PDF — malware analysis report

Static analysis result for SHA-256 79fc6fa5f1f3b84e…

MALICIOUS

PDF

102.1 KB Created: 2021-09-08 04:17:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7e04e4b74a883b43b4f68658cc743ec8 SHA-1: 077dd5765da4a80d8e26e847f159587e883817a8 SHA-256: 79fc6fa5f1f3b84ed0bf5942852e0da3dcc4c1b991175ea6fa68374c45b2c1e4
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous links pointing to disposable hosting and compromised CMS upload storage, indicative of a link farm designed to distribute malicious content. ClamAV detected this file as 'Pdf.Phishing.Trojan-d2568dad23a94d95-10044375-0', further supporting its malicious nature. No scripts were extracted, and the document body was unreadable, but the presence of a link farm strongly suggests a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier clean score 0.2074

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://japhina.com/upload/file/95364823565.pdf In PDF document text
    • http://hitecds.com/userfiles/file/tokuninamitujume.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fe4943d3fd---94279058613.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/5b2ddebed57c67e6d79741d12d10f04b/50596228837.pdfIn PDF document text
    • http://ingenermarket.ru/userfiles/24908982106.pdfIn PDF document text
    • https://ecowaytechnologies.com/ckfinder/userfiles/files/sakuw.pdfIn PDF document text
    • http://2m-m.eu/userfiles/files/2169536802.pdfIn PDF document text
    • http://keifo.ru/ckfinder/userfiles/files/48971854290.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/012r87f0irqf0tt4u18toaql41/41192749825.pdfIn PDF document text
    • https://cornwallstaffagency.com/userfiles/file/pemipudetumefexaleki.pdfIn PDF document text
    • http://harissarantis.com/userfiles/files/bufevogulativabemedik.pdfIn PDF document text
    • http://kimbuunguyen.com/uploads/userfiles/file/semetemesuragupeforexix.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608a16c9656ca---67643162968.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5fc7c55bd6---61615932117.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16089750422cf5---39662987529.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/086f3311c66dd2dc2043bdab7b50ff84/49575187708.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611541bd47c5d---7784071561.pdfIn PDF document text
    • https://affordans.com/ckfinder/userfiles/files/86589251155.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/vobenikepof.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a57e627bdc5---jotazofuzufuxini.pdfIn PDF document text
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/vunevilelapibagureloze.pdfIn PDF document text
    • http://www.dismaplant.com/ckfinder/userfiles/files/30173697156.pdfIn PDF document text
    • http://boathousebrokerage.com/userfiles/file/xuvuwoja.pdfIn PDF document text
    • https://ubk-sad.de/azubi/userfiles/files/97549096456.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc3b2ee8df---5239442932.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=linear+algebra+and+learning+from+data+pdf+%E4%B8%8B%E8%BD%BDPDF 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_off00014acc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14ACC 19184 bytes
SHA-256: b18467658f32b851911a5df4df16f71ca8091c39d6f74733a18b74df4bd47d35
font_01_sfnt_off00017cd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17CD6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1