Malicious PDF — malware analysis report

Static analysis result for SHA-256 de3e7291a97c50c9…

MALICIOUS

PDF

86.1 KB Created: 2021-07-06 14:07:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2e462e8e74521bb14270e52bb32f1a2d SHA-1: 23f0e57d85badcff93a5dd38a2178df188a4e3dc SHA-256: de3e7291a97c50c99509fee8562c79bf3dfdd2ed07fcf62424eafd7a044574aa
156 Risk Score

Malware Insights

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

The PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. Heuristics indicate it contains a link farm with numerous external URIs, many pointing to compromised WordPress sites or disposable hosting. These links are likely designed to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://medvor.ru/uplcv?utm_term=marc+maron+chevy+chase
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/qg6dnu353tb1u5m150li0u3re0/99114931251.pdf
    • http://pvvc.cz/files/narow.pdf
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a614c5b51a8---gededakavolisiviga.pdf
    • http://nensi.si/upload/file/vazufa.pdf
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/fq4fa2lhlvdk1q9esnhkimjqn4/xuneviladugofuzixiga.pdf
    • https://tort-art.ru/userfiles/file/974399746.pdf
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/e7184dc63edd93593837c1fa40239cbc/45298262300.pdf
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/ed3e2b4373d00483ea1c14001d607662/36532761367.pdf
    • http://vietsonplastic.com/uploads/userfiles/file/68703245798.pdf
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16081cb3e7eb68---xexewoje.pdf
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/mokcnpvb4av13kimvi28lq4t4n/81105028109.pdf
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/c22e8c4102ac0c1aee300e3ec72facc6/98568923539.pdf
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160960166cf2a5---sofik.pdf
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/38kcernep9ge8rr6u3qe7kgpuo/wodilafazi.pdf
    • http://yorkiematch.com/clients/6/65/653dc45b8f6063886304ac4260dbb99c/File/60085038147.pdf
    • http://africanhairbraidingsalon.com/userfiles/file/kitelosowuzepoxoxipazen.pdf
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1608570b8d3246---56818054136.pdf
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160d354963500d---29640135192.pdf
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070225cb7ef9---18070585943.pdf
    • http://wongkungfu.ca/clients/f/f5/f5c316b966f29b3192b3e9e3c5714b3c/File/64597064076.pdf
    • https://rivaflo-south.in/userfiles/files/63000566627.pdf
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/2e2ff1338f4f3951b516ee840ad7d271/vepekirisejoguwelugexom.pdf
    • http://ahkjt.com/upfile/file/99191486320.pdf
    • http://hoshitorionline.com/uploads/files/tenixuvogezegu.pdf
    • 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_off0000edb6.bin
9c6f80ffaeba2886c00e67acdf598a3262724d2bcfd38aa8b3ed3aa4407fcc33
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB6 10432 bytes
font_01_sfnt_off00010539.bin
eda507611196ddcf1ab9691efa1cd9b497427d7fc66ff1ca50d0ab793892fdc9
pdf-font-stream PDF embedded font (sfnt) at offset 0x10539 17596 bytes
font_02_sfnt_off0001331b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1331B 16792 bytes