Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d740252fcc02e5b…

MALICIOUS

PDF

75.0 KB Created: 2021-06-29 20:02:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 27d24ac7d521fd496a974cf2be69539d SHA-1: 725b4b9e4da448aa4af973fc616a1086ac4ec306 SHA-256: 8d740252fcc02e5b5b1376ff94f05439e48ecaaf4f2b47e7ad30c87fa159ee1c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised WordPress upload storage. These links likely serve as a distribution mechanism for further malicious content or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • 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.
  • 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://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/gb0tpjp4e86hn4bjheh1pmj324/mokulo.pdf
    • http://fitnessklub-impuls.pl/uploads/assets/file/99638879684.pdf
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607754625f4e9---67823126061.pdf
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091e65e172b4---pefuremegewedegefetukal.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/tobrqcrr670cpim6o99rkr4s55/7551013920.pdf
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608afc394579c---42288220205.pdf
    • http://soldearenales.com/galeria/files/xariguleji.pdf
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/ec0584d3484146e4a3422f8f08d613a4/99369584830.pdf
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/2equnpd5i8emuepmdrih9ecllt/96424157876.pdf
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb1403f207---dekalagukunimumalogegu.pdf
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/brhqu15s9614a4idm0v1tpr8sj/57535784914.pdf
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c87a416232b---62604805500.pdf
    • https://maydangson.com/vietkiendo/upload/file/walusuwab.pdf
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/73282dbdc3950f088fdb02d02a01147b/84830943979.pdf
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/kjsqt2orlc03tk47jcntl55idu/46055627566.pdf
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf58586408d---taviberujiniro.pdf
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/a46e5c6045597878261bab06b5b72d0a/46455534798.pdf
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608faf411d56a---12018731712.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160760c4dd230b.pdf
    • http://rajskiewakacje.pl/userfiles/file/miwesoparulon.pdf
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/5c1fdc1ee4ac2cf68a2ddcf4e4b2b021/vitufogotupuforojawofir.pdf
    • http://topenglish.sk/app/webroot/gallery/files/2287096927.pdf
    • http://magogaralbamoble.com/galeria/files/momokovoniruvoxolipez.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=pain+from+hip+down+back+of+leg
    • 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_off0000c5a8.bin
1bfca9e18329a1bc393d736c64b6c00d73e3381305092a097bfa9aa0d34d806f
pdf-font-stream PDF embedded font (sfnt) at offset 0xC5A8 11120 bytes
font_01_sfnt_off0000def2.bin
052ca6fe8233f9f81ecc974c93de45bc6d6c5a39d91c82e43d341f78f45a9bb5
pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF2 15672 bytes
font_02_sfnt_off000106f4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x106F4 16792 bytes