Malicious PDF — malware analysis report

Static analysis result for SHA-256 03d4b04ac434b566…

MALICIOUS

PDF

82.9 KB Created: 2021-09-03 17:58:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 718e8e53ce843bb75b8067e109a148b3 SHA-1: 2848ec01c99b72ae698b4fc1ccb5b9c96614b9f9 SHA-256: 03d4b04ac434b56640d3de6a83dddb79df9c5bdf8765aeed9748f204271e3789
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload directories, suggesting an attempt to redirect users to malicious content or download further payloads. The presence of external URI heuristics and link farm indicators reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://cevhertemizlik.com/userfiles/files/27805839274.pdf In PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160704e6770abf---90240935742.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16129d4112f08d---38150733726.pdfIn PDF document text
    • http://yejida.com/userfiles/file/vusinapo.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160906acc185e2---54653914382.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/e83068a4e302e1c5532538d5ef3d4d88/pepovidivikawejopuj.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/nucdj9ml98v9351tlqnq3ircu0/vatoduvesotowazemom.pdfIn PDF document text
    • http://htwy.com/upload/file/25042598991.pdfIn PDF document text
    • http://rancholasmonturaspremios.com/campannas/file/nobemopu.pdfIn PDF document text
    • https://duproject.com/uploadEditor/files/33136417845.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/71477049451.pdfIn PDF document text
    • http://adhdesign.de/userContent/files/20210720111545-vijikiparituda.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/e74d3e485d1afd55c5b9168edc33f740/19841959624.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/13349066456.pdfIn PDF document text
    • https://manpowernepal.net/ckfinder/userfiles/files/73942606848.pdfIn PDF document text
    • https://ipic.vn/userfiles/file/kedigadaveg.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b881696b11e---tijopenijetugosanokefisow.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072bb66117f5---79185262863.pdfIn PDF document text
    • https://tckontrola.hr/files/98075685632.pdfIn PDF document text
    • http://kaitosushisb.com/uploads/files/28285055697.pdfIn PDF document text
    • http://domgr11.ru/uploads/files/17480775026.pdfIn PDF document text
    • http://chingyi.tw/userfiles/files/vufesagagusutojetagofedaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=international+relations+css+book+pdfPDF link annotation
    • 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_off0000dc31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC31 18784 bytes
SHA-256: d50fa904a77b0007199be91c8485eda97ef003e973ecaf9b2ef1a529c2c2fed3
font_01_sfnt_off00010d05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D05 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001251c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1251C 10796 bytes
SHA-256: f476264d9b7a26000235940339bf14da081cf8d16ca0629e23b27b662cf77dbb

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