Malicious PDF — malware analysis report

Static analysis result for SHA-256 b936d67ac84240c6…

MALICIOUS

PDF

86.2 KB Created: 2021-06-30 09:42:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6ffad680cb9647f6b12e06288d16ac8d SHA-1: 62a441c41f2ece7ba4fc4ecd9c0fc219684df413 SHA-256: b936d67ac84240c6c200c43552521117b6f962981a3d01a600dd24bb1928fe53
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable binary data, providing no direct clues to its purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/vc4cu7rmuvs3v22h5qqpudqvm0/1566663119.pdf
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/3d4897ead62e345a8010abb98505aa27/16843015861.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b352a439c---raxovogefaguzebum.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/dc23b28c16d817b6a3a0be3b0595fa83/42964535946.pdf
    • https://chameleoncoupons.com/adgprocessing/uploads/files/14891075742.pdf
    • https://sieompaysdebray.fr/lesiom/txt/imgadmin/file/81835639480.pdf
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16094b4768c0b7---95918846911.pdf
    • http://selfmadefilms.nl/userfiles/files/dimujokajubepuxul.pdf
    • http://russkiivopros.com/images/FCKeditor/file/vuwotulol.pdf
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5fd12d2e1e8e325fe390fab92388c63a/serasuvu.pdf
    • http://internationalnetworksolutions.net/files/38573253418.pdf
    • http://ksnjl.com/userfiles/files/zupigewosexelikubevem.pdf
    • http://ecologie-energie.com/userfiles/file/pepatologufaruliso.pdf
    • https://makiriaszto.hu/ckfinder/userfiles/files/tugagatadozebeginokano.pdf
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8def13e1a---98895852632.pdf
    • https://misionesmedellin2030.com/wp-content/plugins/super-forms/uploads/php/files/ifs1gpft491urve6re414httkr/sarogevopatit.pdf
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/3cf1dcc87c91b80e730bfa1b4a8efc27/sixovokuxeseneful.pdf
    • http://capitaloffice.pl/fotki/file/rejubalidadunozow.pdf
    • http://studiophotosfashion.it/userfiles/files/xosonivedebigoragufiz.pdf
    • http://manixcnc.com/ckupload/files/jigatamuweviwugufujulake.pdf
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/f12lh3ah9c46gv33kp8u6345tc/fudilugolukidaba.pdf
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bf927943ffb---33418443538.pdf
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca0bd7419b---13655274895.pdf
    • https://craftsmancuttingdies.com/wp-content/plugins/super-forms/uploads/php/files/ace47fda2ef1ffa931c9da8e44675b97/zibolurogafilaxefesopoz.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=8+business+functions+and+their+roles+pdf
    • 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_off0000effb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFB 16792 bytes
font_01_sfnt_off0001080d.bin
427ff24cbae77c2d9e180921eeb8f7258044f78d639a60a63c3f8b5b9edaa5d6
pdf-font-stream PDF embedded font (sfnt) at offset 0x1080D 16216 bytes
font_02_sfnt_off000131d5.bin
c8fb34f4f7c1fa1c35d4e68d574e43076945762ed632a76429d92a387252b19d
pdf-font-stream PDF embedded font (sfnt) at offset 0x131D5 11068 bytes