Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cb17f39e1fa9f53…

MALICIOUS

PDF

83.3 KB Created: 2021-07-21 16:49:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: b3f2794ba9e31da81a117f1c466bb283 SHA-1: 991e34ddd5fa1125442fbcbef51dcfc7c024089b SHA-256: 1cb17f39e1fa9f53f7a4956b322201fbc77949b9f1db6eddf988e429f7237e9a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6130

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://nessium.fr/userfiles/file/tebenutoxumotepupoxakin.pdf In PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5084cd0ae7---lipunisujizije.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/036d5eb325aa885954e4bf7bd9f40d4f/72750584240.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607ceb15cda87---74781431315.pdfIn PDF document text
    • http://gilleyfamilyreunion.com/clients/6/6c/6ce887ac6ce8bbcacf46524318b1f362/File/vezawomubulamon.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-7-8/20210708012011975786.pdfIn PDF document text
    • https://diphong.com/uploads/bujiziselaw.pdfIn PDF document text
    • http://pallenberg-busreisen.de/uploads/files/64382219013.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/lnr1pne4smv3110v570puvkoj3/muxewezupuwo.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c9a4f997576---tamaxitesizefa.pdfIn PDF document text
    • http://ducthanhtam.com/uploads/userfiles/file/gabefovogovijorojevamu.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/45114078366.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/9034884db35fe705d5602856ba2290e9/94446711343.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/femomasewatujefe.pdfIn PDF document text
    • http://ciskmv.com/css/file/taresugebum.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16080b3aa658d7---jijozolimejujamorowajaxu.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/d7095b2497df96677029124c47886b24/41687624725.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/1fa1cb20a91a2c18ea1b698f2883fdbc/buninidufonanipe.pdfIn PDF document text
    • https://primer-spb.ru/files/files/23192428291.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/ae51974453f6d3ff5be6cd2fb78fc1a5/33202955142.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/6fa7f06139f1433d5f88793cc0f2d2ef/86469066970.pdfIn PDF document text
    • https://clarkfamilybuilders.com/home/clark/public_html/ckfinder/userfiles/files/59111202148.pdfIn PDF document text
    • http://hsound.ro/images/custom/file/61120361925.pdfIn PDF document text
    • http://dhleisure.com/ckupload/files/zisefidigu.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e3d243f44---57915782159.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=fear+and+loathing+in+las+vegas+book+vs+moviePDF 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_off000106ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011f05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F05 10968 bytes
SHA-256: 726f11b78990596d2f9b864124600b8a2dbe768eefc01465b5eac41fe5070e83