Malicious PDF — malware analysis report

Static analysis result for SHA-256 af77d332d2bd7ad0…

MALICIOUS

PDF

91.6 KB Created: 2021-07-03 04:59:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 5d3d562a0c6a58eca24408c5d507a087 SHA-1: fa8ab51bab2db1055d84ad421012ff2fdad59bb9 SHA-256: af77d332d2bd7ad0100706ab97cdb61d13b6726c1bc0f79cfb032a58fd7ab32b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites acting as link farms. The primary URL suggests a phishing lure related to social media message requests. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ketchas.ru/uplcv?utm_term=how+to+see+the+message+request+in+messenger PDF link annotation
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/4300cce4c0105455539e3a20b29f1dde/74097564335.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/lenutakegonap.pdfIn PDF document text
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/5d97dc40abeccb6db7abcfe04671857f/kosufagira.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608e75a40150d---69566183140.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/5eb63415dfaaf9f715f68f81482fa140/47734191124.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/9v5l5iok1mdp25novn9esqau8s/19267303755.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/11548610893.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5ef0e4400---51597888052.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/68ac74a456fe89d26a3dc9ca15091338/remolagezidofunepomekigi.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a6456d49409---24116483873.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/62899397511.pdfIn PDF document text
    • http://grupophi.es/uploads/files/zoxulagomexojazalibetenix.pdfIn PDF document text
    • https://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/dd258196519d2c0500dd4bc6c6fcad81/85126558207.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/crf9rqnfc257tq2l0p6ue9umc0/79818225075.pdfIn PDF document text
    • http://krugernilssonreunion.org/clients/c/c3/c301050bdfa85653d7453904791897ac/File/dogavobonikosupevigape.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b04fe770c01---15246705949.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/6b0ce6a3e0384ac67ee883165c3fe07a/68724765638.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b440a2b9b88---42393755284.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/4099a6ad25c53fa2c1c183a982775b39/65860456637.pdfIn PDF document text
    • https://tempatpasang.com/contents//files/guluvelanafiduvugugiso.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7d77bee11---15258824347.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075eacb47279---zaviwijadakijaxowovemo.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a028d90d05e---38952392084.pdfIn PDF document text
    • https://zhansq.cn/upload/file/11353030494.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/555846858b5a636cd72322655e651e80/81399856542.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c47f375433f---63038501394.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b0475076b4---32848477614.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_off00010311.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10311 16716 bytes
SHA-256: f3b8a4bed47e9a0796e55b45454b44ec0c7c75e8d298725b2b0e64867658c7be
font_01_sfnt_off00012e32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014649.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14649 10832 bytes
SHA-256: cbc3b58d475640568c5ae1df847e40cc5b21f4b1586645ce90fcb37fe3f9dc52

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