Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e6a9171e2bda250…

MALICIOUS

PDF

112.1 KB Created: 2021-07-13 20:47:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b80ba9d016c5e2547ed632a98900634d SHA-1: 265ae8cff8136d5f7cb0840f08d4f50b3ff274f2 SHA-256: 6e6a9171e2bda25043c2a273cf50accceaf8e6f4863f8e9abfe9e98270d1beac
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 WordPress installations, suggesting a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the URL structure and heuristic firings are sufficient for a high-confidence assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://ketchas.ru/uplcv?utm_term=oblique+asymptotes+of+rational+functions PDF link annotation
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/bumkf1cp9o3vhrhmrr939c2l2b/sukosimavodogivin.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/32327f8cb9f876e4700dfcccfff6dea3/zogudomekog.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/06a36d5574ac053812c745ea50be53ff/mukifilofixenamuzixad.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/e64053e9dc684d04bde924981b56de55/26267418908.pdfIn PDF document text
    • https://monuments-msk.ru/wp-content/plugins/super-forms/uploads/php/files/749e84c0b8a3a302505b667b896b0205/59148672517.pdfIn PDF document text
    • http://zuche0551.com/upload/file/darivuke.pdfIn PDF document text
    • http://mgocsm.in/userfiles/file/migudaragifarumovelen.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/8ab9c9c2e271e0856229975debcea28f/xokerunijijule.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/lmkt1mef4negk376llsaehi077/baletorasudulesepuxed.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6dbf8298c---54294768161.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f54178321d---bowedodefimowedexaxigamo.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fcb680d691---rexerusazodorome.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607994a069567---46829221886.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/c14497f75924c7cf6f61cb50a7fc0dd1/83514375259.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/f07286fc1e11d4eacf06de9ad5a3f31e/furomerexunojagozixup.pdfIn PDF document text
    • http://anapro.com/ckfinder/userfiles/files/pazasufumurowe.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/0ae313bbeca40868ee2e5dd2b6e14d31/75706380687.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160783b7741524---zujipanapudup.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/wedepizire.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/65462473862.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1c9498915b---relinejirafat.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013317.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13317 16224 bytes
SHA-256: 7dd5fb61ea0ea1e3370d26720032e9d3de5740e898843eef2fe92164eee2597e
font_01_sfnt_off000148f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016107.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16107 21028 bytes
SHA-256: ea58ac9c8c01cf076f46fd209d0dc2316400f671b91b9f3e16594bd48b2d04f6
font_03_sfnt_off0001989a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1989A 11168 bytes
SHA-256: e4133fff92d43c35e2241d5d7ea30ea28f2179d6026da963440ed9ea0405363c

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