Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc4ac6f75b37ef68…

MALICIOUS

PDF

92.9 KB Created: 2021-08-03 22:37:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 784d5212ef1cdfc0829191185ae76a5b SHA-1: fc81b3729043f934bf7a3b88bc6ffb8726a7d9af SHA-256: dc4ac6f75b37ef68371b137a838e4792d5f2643363818b42be0b9a9e4b4f887a
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 or disposable hosting, indicating a link farm for SEO poisoning or phishing. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious content or phishing pages. No specific family was identified, but the techniques used are consistent with common PDF-based malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9903

Heuristics 7

  • 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.
  • 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://ytdrive.com/CKEdit/upload/files/32734450353.pdf In PDF document text
    • http://www.kymenhome-etsinta.net/tiedostot/files/60759862329.pdfIn PDF document text
    • https://amadesafar.ir/basefile/amadesafarir/files/punetara.pdfIn PDF document text
    • https://liur-krd.ru/userfiles/file/96129294963.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/8cf4b2965de0df9ee9c01438f0289e28/sedepudupowovedivutuv.pdfIn PDF document text
    • http://eldmsh1.ru/js/ckfinder/userfiles/files/1894870964.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/3f6853be6a1ad9ae966d5ab1a2c86d7b/6371316838.pdfIn PDF document text
    • http://cke.hk/userfiles/96342739455.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608099b2de53c---64589361349.pdfIn PDF document text
    • http://iphysiology.ru/upload/75424489551.pdfIn PDF document text
    • https://channeloflove.com/ckfinder/userfiles/files/wofabowunumuxiwe.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609202ac4e2f9---24028231208.pdfIn PDF document text
    • http://nghiencuuykhoa.com/uploads/userfiles/file/74977899203.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/gawolaxodug.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/vp0kfs7npqrt55rin1pgereino/89174847270.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/0cb3222eb83acfd816d01cad3def48aa/78441772968.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a366027f042---35407524322.pdfIn PDF document text
    • https://coluer.ir/documents/file/29946761824.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/d6b96eba1992e8692891192592503556/31369542470.pdfIn PDF document text
    • http://bloemenwinkelindex.nl/images/uploads/13546038598.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/7100813687.pdfIn PDF document text
    • https://wendi101.com/userfiles/file/funelowolijukawurafa.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071a83dbe9a5---20018964326.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608658c5d4cdc---rifetonet.pdfIn PDF document text
    • http://nineslash.com/user_file/file/89554010207.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b01aa526eb3---71063541991.pdfIn PDF document text
    • http://flirdining.com/uploads/files/busukomavefagubebelufojag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=ejercicios+de+division+de+polinomios+con+fracciones+resueltosPDF link annotation
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eec8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC8 17172 bytes
SHA-256: 4872a168a71471b28739b588a73a7f7e4d7c2d182f28818a47585d3cb3a2a0f2
font_01_sfnt_off00011a55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A55 11060 bytes
SHA-256: 88c5e3775a5ca97d097b4ffb529c4943db3345dca2b9865c67d0fe96d2d3c6b7
font_02_sfnt_off0001340c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1340C 16304 bytes
SHA-256: fd831f8a239d989b17d634ff15357c15abceab4494fee6227fe5cb1b70c826aa
font_03_sfnt_off00014a2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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