Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cbf4de25526796d…

MALICIOUS

PDF

92.0 KB Created: 2021-08-13 12:12:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: c71f9070aa565e18dfedc3f47ef7404f SHA-1: 3ac2706d9ecc6e612f0729df8d5c84d742315210 SHA-256: 3cbf4de25526796de4508afb8bc40c0207b5a8e720810342c4e2f6bb8a355fdb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://crewmak.ru/uplcv?utm_term=cs+go+freezes+my+pc PDF link annotation
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce0896cf45---zuselovasibidagakewalur.pdfIn PDF document text
    • http://skincarebylaura.com/clients/862251/File/pexagoxarafonezatezofefel.pdfIn PDF document text
    • https://abzesolar.com/uploads/files/99903633751.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/dsks73tncsldrt3o0kue44uefm/80920271805.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/bd15bdbf6df6de782efab9c7132c4f4b/596083721.pdfIn PDF document text
    • http://dorisemitchell.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sexilamax.pdfIn PDF document text
    • http://samnakthodrahassob.com/userfiles/file/51312018375.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c83655c7a3---12563037159.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/179d1fa414fde06f29d9b8564437eb77/10783116737.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/6f2f735e35f34b9df537e522361228b0/paxuzazalemu.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/95280716822.pdfIn PDF document text
    • http://mega.kz/media/upload/files/94925175248.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/b048690ca6732ecbb2e293766362621b/78322312871.pdfIn PDF document text
    • http://stoewebdesign.no/userfiles/file/95043195223.pdfIn PDF document text
    • https://ezastupitelstvo.sk/editor_uploads/system/files/14821041997.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c72b496d587---wivufiziwofe.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/45cd050ac6da65ffcb733ad5da1d36da/64078009394.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0c343c864---12005711800.pdfIn PDF document text
    • https://www.vignolaweb.it/ckfinder/userfiles/files/68343699631.pdfIn PDF document text
    • https://master-service.ro/images/file/jugobiromijinukodaxi.pdfIn PDF document text
    • http://stoewebdesign.no/userfiles/file/31938203706.pdfIn PDF document text
    • http://kimhoatra.vn/upload/fckimagesfile/67527700285.pdfIn PDF document text
    • https://tjpapigroup3.com/contents//files/zaxuwe.pdfIn PDF document text
    • http://londonjip.com/userData/board/file/duwunererawevixifu.pdfIn PDF document text
    • https://stopserv.ru/files/file/wamadodukelog.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_off00010461.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10461 10528 bytes
SHA-256: 9459deacca3dcfda9d9efdbde64c8e4554fcd884f2db88b699a5dbf8774303e8
font_01_sfnt_off00011c74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C74 17612 bytes
SHA-256: 4189d1472486afcab92ef973b24ddd52d50fab61ba9fd09d9655346ab8cf0f67
font_02_sfnt_off00014a95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1