Malicious PDF — malware analysis report

Static analysis result for SHA-256 265de6ef7f40364e…

MALICIOUS

PDF

92.0 KB Created: 2021-09-02 05:28:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b855793643329a29cc1b2c90149fb7b5 SHA-1: 1b6d30ca28da3d3fac1e6bce8437ba4246d6bb68 SHA-256: 265de6ef7f40364e2e4481fc24b40df27829d607556a220bd6627651afba583f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm or redirection mechanism. The primary purpose appears to be directing users to external URLs, likely for phishing or to download additional malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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=holt+college+entrance+exam+answers PDF link annotation
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077acab95acd---81642720398.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/c3e0ba57982d0c00fdc8c04c9c1473f2/2584478698.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/jolidejip.pdfIn PDF document text
    • http://asorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/7490843337.pdfIn PDF document text
    • http://bbfrontedelmare.com/userfiles/files/wagabapa.pdfIn PDF document text
    • http://studiomanzetti.it/userfiles/files/92248605759.pdfIn PDF document text
    • http://s-moonlight.com/CKEdit/upload/files/30218350377.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da4ee81a5dd---40049555041.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/e2f5a74414f9226b5f21a12b74941957/82532748898.pdfIn PDF document text
    • http://verduciautodemolizioni.it/userfiles/file/zafigaxojadikigu.pdfIn PDF document text
    • http://viviapalermo.com/userfiles/files/2114555783.pdfIn PDF document text
    • https://olterus.net/contents//files/7691308720.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ab1afd33275---toner.pdfIn PDF document text
    • http://szzxwx.com/Upload/Upload/file/20217152053581325.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/bda12b47a637181d65c5e5b181a0f62a/71195342271.pdfIn PDF document text
    • http://minhledtran.com/luutru/files/24034406151.pdfIn PDF document text
    • http://sapaelitehotel.com/webroot/img/files/29203126652.pdfIn PDF document text
    • http://tce.vn/imagesflashupload/file/49179846330.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/db8fcb79e348147150d31caaaac9cde3/wawovedawesa.pdfIn PDF document text
    • http://chipublichouse.com/ckfinder/userfiles/files/vigowovevaw.pdfIn PDF document text
    • http://gangwonbnb.com/FileData/ckfinder/files/20210706_2F606E77FD772A8F.pdfIn PDF document text
    • http://compow.net/ckfinder/userfiles/files/puxobus.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ffb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000117c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117C8 19084 bytes
SHA-256: 758f79ca4dceb74f778a3d9b41bb2e78d7e85117eea609979b1f7619755d7bef
font_02_sfnt_off000149e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149E7 10660 bytes
SHA-256: 30daf572e7a577d422ffb89a5235d7878da570c6f4fa44dff8e874335f3ea084

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