Malicious PDF — malware analysis report

Static analysis result for SHA-256 b907ac5b5e12a082…

MALICIOUS

PDF

89.6 KB Created: 2021-06-30 22:50:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bd9800624f7d49dbd7c23daa4a4f7aa1 SHA-1: 33fd8c3649725b9e80baccf6a0ea41490d2dee4a SHA-256: b907ac5b5e12a082213d6d3081016a0af1e27d7a359c4efd0d84b59763648821
164 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable domains. The presence of a 'download button' lure further supports a phishing or malware distribution scenario.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://wchs67.com/clients/f/fd/fd50fd9748f3592dabdfdad26f378f15/File/situjuwazopilijemirupefi.pdf
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609b917781d7a---51146626038.pdf
    • http://modnyi-buket.ru/uploads/files/69805138997.pdf
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/361afa8bc9aa32bfdfca927e74199885/82067651666.pdf
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085acada7ac8---59863782179.pdf
    • http://celcg.pl/uploaded/file/lepufugekedivukugukubupa.pdf
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/662d146f729878cb20e01b96de4dc375/mapamizeki.pdf
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/d3367cfbad02c0675976c40aabf5e125/lowodolat.pdf
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b28614251a0---luberi.pdf
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2fca0584e6---gunasaxebafi.pdf
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/5baff86d361f3ab52a238f23b17034d5/11098814766.pdf
    • https://arnetbilgisayar.com/upload/ckfinder/files/46609522736.pdf
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d63ee1b7c---vasolabeg.pdf
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/j6au9isg0tk3p07db0oh81u4tq/tobapugujuromoket.pdf
    • https://factinet.com/uploads/files/ripuk.pdf
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160983333ecedd---fifiridokuzob.pdf
    • http://alpha-cp.com/userfiles/file/16647707896.pdf
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/584dfd1ad46b86ca446ec1208b06efe1/1234132172.pdf
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160cecb207f7e2---xupusifagex.pdf
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/lund5j6cu4kcdc47jmsanktgmd/80147275334.pdf
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/3df34ba4eea6f825d7c9b1b5d5c01e98/37704686636.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/0d93e69a74b2e2238427fd5265db1474/5851178502.pdf
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/h6dlal6eln8ciktl276prutpe4/lokiwujobamibirova.pdf
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072093f4840a---77061720257.pdf
    • http://goteneplast.se/files/images/file/63220333911.pdf
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/aua63v7g5e6k91ajdj2es84unq/58431826725.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=forest+exam+paper
    • 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_off0000fc35.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC35 16792 bytes
font_01_sfnt_off0001144c.bin
ff3efea70e9a216b2384275cfae0f5c95be1e016ea0ed30dbfa0ed707d7f378e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1144C 10252 bytes
font_02_sfnt_off00012b68.bin
ee3375e70ac2aef389a066340c1bbfcafb62b0ae43cf9e15d8cf85d74f69dc51		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12B68 17372 bytes

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