Malicious PDF — malware analysis report

Static analysis result for SHA-256 62c46cd0d2630a85…

MALICIOUS

PDF

101.3 KB Created: 2021-07-13 21:19:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: ccac6c802da6545f26ab653f3f3f606f SHA-1: dbd51fd459ece63102fa182774958fda47a433fd SHA-256: 62c46cd0d2630a85185a2f5cf5d9f197d1c66cc2f3182e2e392d324bb7a458df
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous URLs pointing to external sites, some hosted on compromised CMS upload directories. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather to host links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9737

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://coretry.ru/uplcv?utm_term=doodle+meaning+in+tamil PDF link annotation
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbdc68718f---82671433352.pdfIn PDF document text
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/nibuwajitegapowonatam.pdfIn PDF document text
    • http://cphs1970.net/clients/877309/File/56497762731.pdfIn PDF document text
    • http://imhyuk.com/imhyukeditor/userfile/file/nubugumugobaratipaxezurim.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/e016c148f08c9c73ed06382eb25415ae/jenexibaw.pdfIn PDF document text
    • http://babyindex.nl/images/uploads/viravawup.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/fj9n8vcfcpm7lnu413pnb4vidm/881281912.pdfIn PDF document text
    • https://www.makathastaliklari.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5d90cfdf8---zuxozalimipobawowi.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/t83lgv113p6ovjkvio2rcn63sc/60674427405.pdfIn PDF document text
    • http://centronegozi.com/public/47575142916.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078abd074a6c---63685577021.pdfIn PDF document text
    • http://caigeshi.com/uploadfile/file/2021062803465973499.pdfIn PDF document text
    • https://papersacksfactory.ae/images/bulk_images/files/42331153516.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160920e186819c---vudipixewawar.pdfIn PDF document text
    • http://thetuckerfamilyreunion.com/clients/67950/File/53768999937.pdfIn PDF document text
    • http://michaelwilliamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/70173926444.pdfIn PDF document text
    • http://xn----itbbfrdrdbd4bgy6gi.xn--p1ai/webroot/files/files/82246534315.pdfIn PDF document text
    • https://murderescape.com/wp-content/plugins/super-forms/uploads/php/files/4ced3672f6731f52b4523b832c57ced2/fojupukogigu.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085c326acbca---fegeluj.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160bdc82a838c3---sosirapajugenotukazabid.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e82b413776---6934716737.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607685717f042---sagojojegodadovozasaf.pdfIn PDF document text
    • http://cesmclassof68cheyennewy.com/clients/82478/File/75078687073.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fdef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDEF 2872 bytes
SHA-256: e80ac07eaa87dfa1abb4aae52e54b7fcaa0e0f07d9c2c6f572beb5a8c8477754
font_01_sfnt_off00010a07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A07 10324 bytes
SHA-256: cd1664355296a0d3012843b099e8a766a9d2943f5645e9cfe127e74340596ad7
font_02_sfnt_off000120fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120FA 19068 bytes
SHA-256: c5a94608a6bd87de7730bf5cc40ce4a1c45e920e691e8023ee8c80419c53b2d8
font_03_sfnt_off00013fbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FBC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off000157ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157CE 18012 bytes
SHA-256: de052a2bbc9a05181c3567706f852544661d6eeefaadf987eb17d5cc7dde86a0

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