Malicious PDF — malware analysis report

Static analysis result for SHA-256 d41ae12ebde55174…

MALICIOUS

PDF

100.9 KB Created: 2021-07-07 02:44:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 04dd52427e6e7b5cdb396721d4a0ccbc SHA-1: d199b02800f29ed5bd2d626afe4c6f721e665acd SHA-256: d41ae12ebde551749d0a21c09aee737ce6b6a44a8009ad60bf87c43d5fc17572
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external URIs and links to compromised CMS uploads, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic firings and numerous URLs point to a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

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://huntic.ru/uplcv?utm_term=family+feud+surveys+and+answers
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073fdd2ea19a---2873222161.pdf
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16094cd4d383c4---xesun.pdf
    • https://arichaindia.com/userfiles/file/mofogobalozafifivem.pdf
    • http://cleangroupbd.com/ck/upload/files/80358395629.pdf
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/5ag7fgarngptago39ds61gfvtp/ziviwuguxexepe.pdf
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160793dd69f8d4---pupuponepuravewit.pdf
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608274f173b67---66282236271.pdf
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/0ae349ee1860501e9f382728658a1c9d/misajugodixi.pdf
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/68c1f4aac191397b8454b97271aaf3ce/kekusagexufik.pdf
    • https://dolupin.com/calisma2/files/uploads/rivanojemukuxoge.pdf
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609733060d6ad---vukitupuxekenaxakire.pdf
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/267a1f3e939e7fc2ba762dcacbe70736/gurimojizora.pdf
    • https://travelsafeway.com/userfiles/file/38775490691.pdf
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/466d538a812d5acc93ab012527e845da/vokirelarisodopukazutaku.pdf
    • http://zwickerfoto.hu/_user/file/pewobesi.pdf
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d8f9712e340---85991840784.pdf
    • http://happysmilecard.com/uploads/files/2791958294.pdf
    • https://www.ppmcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/1t9jqbl42bim8i2mqn8aivsbhc/sekufujiwijolivol.pdf
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b4aa56dc4---53911925130.pdf
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160772ade2a28e---58938938409.pdf
    • http://aceonlinementors.com/userfiles/file/muxabinof.pdf
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16095197f643eb---jezojud.pdf
    • http://gocreate.termall.pl/upload/fck/file/wokogovuzakefegaduderok.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_off0001298d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1298D 16792 bytes
font_01_sfnt_off000141a4.bin
65d329bddfe4a88e2466b86de20bc9488a7fa07a1c6c86af2c60c822230ee09e
pdf-font-stream PDF embedded font (sfnt) at offset 0x141A4 10640 bytes
font_02_sfnt_off000159f1.bin
e907f05771ecbfc1748ad2921572124a91a5be874d8afa9cdd2f453f7e21494b
pdf-font-stream PDF embedded font (sfnt) at offset 0x159F1 17272 bytes