Malicious PDF — malware analysis report

Static analysis result for SHA-256 79df57f0a239cfc1…

MALICIOUS

PDF

108.2 KB Created: 2021-08-03 11:08:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4b9e3da8149637b2f74db75fb031551b SHA-1: 8ddbbd618aa67a99e7165a3b5c911f99ffbca25b SHA-256: 79df57f0a239cfc18c14ed75e9c3771ebb9af480e831306a4a0435cdfe6e62fe
124 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan. Static analysis revealed that the PDF contains a link farm, with multiple URLs pointing to compromised WordPress upload storage and other potentially disposable hosting. These links are likely intended to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3906

Heuristics 5

  • 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
  • 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://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/c765c5b2c5047da041f367cd421d044e/pegukezirako.pdf In PDF document text
    • https://radio-aurea.eu/files/file/tijisefepidadebasiwotifi.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/tipuwokigodalin.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/4dff5238bdb44803a55a84893e42051e/19433328280.pdfIn PDF document text
    • http://murphysbeads.com/clients/54316/File/93640131210.pdfIn PDF document text
    • http://ropesadventure.com/d/files/lefutamumo.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/demejomudifikafag.pdfIn PDF document text
    • https://remoteyourstaff.com/calisma2/files/uploads/konizalinovupivowuzakov.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/18ad8170e71e3d234a51b8a7526a06fb/tatez.pdfIn PDF document text
    • http://qhzs88.com/admin/fckeditor_upfiles/file/2021071304503980554.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/8aad6057b0884e3101c962d3917da87d/fotejibopiwolele.pdfIn PDF document text
    • http://artkulinaria.pl/sites/default/files/file/16703176808.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/92d571696265a8dba371a20a60d18bd1/palizekurerotef.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/a3036i0rkg16382tib8nvo9bgc/lowibamiri.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c84b77ba4a---dedurasojuvatiketanutel.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/4e73gnjlqa0m1e3tt71g5dksej/61944116982.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7fc85c171---junufokifik.pdfIn PDF document text
    • http://pajurioverslas.lt/ckfinder/userfiles/files/pexitozedina.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/5607i6qkpgspm25kp6oam1t0tu/91420110166.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/b683o23de426k4b4jc4b193e0j/98921965485.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607beda122414---11894519317.pdfIn PDF document text
    • http://ebiocell.com/uploadfile/file///2021062423132311.pdfIn PDF document text
    • http://beachfirebrands.com/userfiles/file/tutafonevi.pdfIn PDF document text
    • http://chrislahoda.ca/userfiles/file/73729767010.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=fsd+onsite+study+guidePDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001615a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1615A 10304 bytes
SHA-256: 33bc171b335e9321ac3bb515c78693a3e6643378ba427e00589881ae330a8ca3
font_01_sfnt_off00017884.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17884 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1