Malicious PDF — malware analysis report

Static analysis result for SHA-256 79067596a7a9962d…

MALICIOUS

PDF

79.5 KB Created: 2021-09-08 05:24:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 13a71214b15f27ee741f7c5c2038f41a SHA-1: f58b210997c51db0247a81731a729ad2350a2c0b SHA-256: 79067596a7a9962d32d575a2387793b015b2cf70e01101f89a7734dbdc73b43f
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the URL patterns and heuristic firings are sufficient for a high-confidence assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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=y%C3%B6kdil+sosyal+bilimler+s%C4%B1nav+sorular%C4%B1+pdf PDF link annotation
    • http://jlssj.com/qianzi/upfile/case_editor/file/japukanazisotuwo.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/76319276916.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/bs49vpc4tgsms3onr6513ffmsi/sapukutenejiviv.pdfIn PDF document text
    • https://tideandtigers.com/ckfinder/userfiles/files/fexilat.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/faa693d28aa0ed1cd9911149acc2af81/kadutanaruselabo.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/ea25bc8e7c9dfb0d3fbe6bfe7e0656d3/56451871220.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/33fe31302810e12260091959adb7653d/56428684556.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///fozusowuv.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16075a36bf1a05---puxuvopakakumofe.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16072785674757---puwapilufaposise.pdfIn PDF document text
    • http://bamila.vn/luutru/files/84328332581.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/9e17e56bf82e0fe3aa58b1717759f54c/54184886891.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/7f65968df6285a5398a2499016b2929f/jutexekezatulejixuf.pdfIn PDF document text
    • https://emailing-online.fr/uploads/userfiles/file/6156454616.pdfIn PDF document text
    • https://nonbodepsg.com/uploads/files/zadebomujujozezeli.pdfIn PDF document text
    • http://moyamoya.center/images/hand_uploaded/files/junuzudan.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210826164307.pdfIn PDF document text
    • http://dentalweek.eu/userfiles/files/78394317904.pdfIn PDF document text
    • http://www.naraihillgolf.com/admin/userfiles/file/90807839007.pdfIn PDF document text
    • http://eksan-ltd.com/userfiles/file/58197804119.pdfIn PDF document text
    • https://cyberbirddog.com/userfiles/files/27632442092.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_off0000d134.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD134 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e94b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE94B 11316 bytes
SHA-256: 2efc3ea336e35333d283cfb157b894e3530db6c85926ad7f5206ba084d678457
font_02_sfnt_off0001033c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1033C 17580 bytes
SHA-256: 6f5fbde33ddf5bb4d2d4cd1f324bf6a0add596e03c0a4289fab0d5af1e55d55b