Malicious PDF — malware analysis report

Static analysis result for SHA-256 10f48339a14b75e8…

MALICIOUS

PDF

87.5 KB Created: 2021-09-01 20:46:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 363b65a76114b7b627d055b3af98ead4 SHA-1: 8c44dcf3e331b0d6b65166bfc0d702eb1b7251a0 SHA-256: 10f48339a14b75e8280c0d1e15eb2e37c4d89ea415dd6ad6f1abfad93acf6ef3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or malware distribution lure. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites, likely intended to redirect users to malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using disposable hosting for these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 https://medvor.ru/uplcv?utm_term=how+many+sides+and+corners+does+a+cube+have PDF link annotation
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160820ca6dff25---87844298898.pdfIn PDF document text
    • https://elektrona.cz/files/file/zegugekujorug.pdfIn PDF document text
    • https://apskarota.org/userfiles/file/39048048802.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/16082608c6c974---zutiladewurezodo.pdfIn PDF document text
    • http://www.dramayaramendes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607739baf098b---garezugedijusasekimu.pdfIn PDF document text
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/45252284592.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/161126130236cf---tuwodukojelusamogiv.pdfIn PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/12520639137.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a37e0701a22---96479484521.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a50536bfb04---8304327371.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a8b461bf584---nijetekewinibilijekig.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/97368743082.pdfIn PDF document text
    • https://www.cylinder96.ru/admin/ckfinder/userfiles/files/xabumebelinex.pdfIn PDF document text
    • http://damoorefamilyreunion.com/clients/7/71/71c8bb141a0941b69292984b9770a174/File/zodixigadupifeguvokadodi.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607750a007781---36028469960.pdfIn PDF document text
    • http://kielcenoca.pl/files/file/kebupuvisuravimoxep.pdfIn PDF document text
    • https://isosklo.cz/uploads/93776365839.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/rowiguvevaxefipetonizifi.pdfIn PDF document text
    • https://stopserv.ru/files/file/wumajijiwadaforidel.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/gojiwixakarirulitinozawa.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/fa56cc2f5f4ea015fc9a251918bffa0c/lokux.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161168d2e980d2---39056099035.pdfIn PDF document text
    • https://immo-macedo.lu/userfiles/files/nugalijazizefuvitafalijo.pdfIn PDF document text
    • https://avflash.nl/upload/files/55678218750.pdfIn PDF document text
    • http://ketoanaca.com/uploads/image/files/25604075851.pdfIn PDF document text
    • http://ergo-logo-bamberg.de/userfiles/file/rifolubenivokalafiko.pdfIn PDF document text
    • https://resicolor.com/upload/files/jawivuduxe.pdfIn PDF document text
    • http://year-c.com/upload_fck/file/2021-7-29/20210729191034278818.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF2 18592 bytes
SHA-256: 82ac4e0de66fcb8bd20b8dc7bbec71537e61725ec3623b19dd96c349f975989d
font_01_sfnt_off00011d57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001356e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1356E 10988 bytes
SHA-256: f67226f9e30103128722e567713a0465dd868d347dbde712c257554f5751c441

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