Malicious PDF — malware analysis report

Static analysis result for SHA-256 c585367c9de6ca8b…

MALICIOUS

PDF

80.5 KB Created: 2021-09-23 10:06:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: dd185b8a0326f02faced703b6861a786 SHA-1: bdaf261bc832ca87928a4d596094d430988f1e67 SHA-256: c585367c9de6ca8b0e4bd07cf5b659515e3318eb05df1ef3b7c42af9e42c623f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to compromised websites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The document's structure and embedded links strongly suggest an attempt to lure victims into visiting potentially harmful sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://nomylo.ru/uplcv?utm_term=how+to+edit+audio+in+video+in+android PDF link annotation
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/49jh4nfct4gbd3orrq7a92idht/65033446825.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/161414aebd5ac0---sakakevuvowogojiwipe.pdfIn PDF document text
    • http://comlark.ru/userfiles/files/99268039142.pdfIn PDF document text
    • http://shyjjc.com/v15/Upload/file/2021914728127177.pdfIn PDF document text
    • http://tongdingjixie.com/d/files/mezuxuxinefuxiwibovez.pdfIn PDF document text
    • http://radioevangilereal.com/assets/ckfinder/core/connector/php/uploads/files/dereza.pdfIn PDF document text
    • http://tdjl.com/uploadfile/file///2021090505204719.pdfIn PDF document text
    • https://dlt-nkp.com/fileupload/file/supuvu.pdfIn PDF document text
    • https://economiadecomunion.net/ckfinder/userfiles/files/64703065110.pdfIn PDF document text
    • http://kemenyseprosiklos.hu/upload/file/86700673842.pdfIn PDF document text
    • http://tbvshungviet.com/upload/files/zoberejegewezowifutan.pdfIn PDF document text
    • http://osc-pribor.ru/products_pictures/file/rowogotewalexikugadazub.pdfIn PDF document text
    • http://rockpapersun.com/upload_mce_image/file/fawij.pdfIn PDF document text
    • http://www.39koratmachinery.com/file_upload/files/ramefil.pdfIn PDF document text
    • http://csc-028.com/userfiles/file/20210911202707_ojjkl8.pdfIn PDF document text
    • https://linker.tw/files/62813479738.pdfIn PDF document text
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/sitaxa.pdfIn PDF document text
    • https://groupburuemas1.com/contents/files/nemotu.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130b2cae893e---34526676893.pdfIn PDF document text
    • http://ps-chiptuning.hu/userfiles/files/49581921830.pdfIn PDF document text
    • http://romengo.com/ckfinder/userfiles/files/rixuwagabogi.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/70937883057.pdfIn PDF document text
    • https://lyonsinn.com/nbloom/fckuploads/file/19185648618.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_off0000d52f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD52F 18280 bytes
SHA-256: b24160c47f95a188d8b531b85fa9b4c19507540fd91c4324e44f813dbdd374f0
font_01_sfnt_off0001048d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1048D 10272 bytes
SHA-256: 38058443c7cec07c0a56a02e8709652a20a5ff65e7bc17588c3284f9df28ecb0
font_02_sfnt_off00011bc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1