Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c53ce7de256858e…

MALICIOUS

PDF

75.4 KB Created: 2021-09-27 01:31:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7c5a3c186526aa7cace0dca371cb4500 SHA-1: 3da7063e0cf0cd0df3a59f48031c9ab5d020f54e SHA-256: 3c53ce7de256858e667f24b067476ce457d9433aaa56186733e31e537bc7894f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://inwebjor.ru/uplcv?utm_term=my+talking+tom+2+cheats PDF link annotation
    • https://happycolaborativo.com/uploads/files/tilubeginizisexolefepi.pdfIn PDF document text
    • https://vicareyou.com/userfiles/file/wesipoviven.pdfIn PDF document text
    • http://arnoldbolingbroke.com/ckfinder/userfiles/files/febaxumi.pdfIn PDF document text
    • https://soudurelausiere.com/upload/editor/file/71396203816.pdfIn PDF document text
    • http://aokunoil.com/ckfinder/userfiles/files/vemaxovowikijowe.pdfIn PDF document text
    • https://lean-ds.com/upload/editor/file/nutogukazefedan.pdfIn PDF document text
    • http://snnet.kr/board_pds/fckeditor/2021/09/file/9453506903.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/nolenemosinusodotimixi.pdfIn PDF document text
    • http://diagnosticaedilizia.com/userfiles/files/xerapanagixorexepe.pdfIn PDF document text
    • https://dennismaloney.ca/upload/editor/file/keluzuratokogimagalupan.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16132e03c7dd17---legowogojofutut.pdfIn PDF document text
    • http://xn--djr00fsyfv0o5qgy9u.com/filespath/files/20210917114717.pdfIn PDF document text
    • http://optometrystaprzemysl.pl/userfiles/file/woseravilavimilepesudobe.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/4a77c4d7295e2711aa6b15e8b6826e2e/nesowevavaxetu.pdfIn PDF document text
    • https://evabizz.com/userfiles/file/sepuromunel.pdfIn PDF document text
    • http://fsanaq.com/upload/file/210913010624961002fc2oibjjfvrm.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/3ad5de77546a8da42f06c0cad10c79f3/26449381542.pdfIn PDF document text
    • https://projetounificado.com/uploads/files/tolufesuwipe.pdfIn PDF document text
    • http://zkqzl.com/uploadfile/file///2021092105542098.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/rakopedodusaxiget.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/4988476086.pdfIn PDF document text
    • http://siciny.pl/userfiles/file/18554344425.pdfIn PDF document text
    • http://zhfangyuan.com/uploadfiles/files/zudarodu.pdfIn PDF document text
    • http://e1pl2.nazwa.pl/busy/fotki/file/xavanivavus.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_off0000bd2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD2E 18608 bytes
SHA-256: 046a43063caaa5177eab1a087b0ee5d6da19aeb143f3e714dddde4980327a21e
font_01_sfnt_off0000ee6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE6C 10896 bytes
SHA-256: 7bf9b0acbf84eab19f44c670ba59373b0fd6934038757e4ca8b7182804c3e355
font_02_sfnt_off00010788.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10788 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1