Malicious PDF — malware analysis report

Static analysis result for SHA-256 260b8a038d4e91b0…

MALICIOUS

PDF

72.2 KB Created: 2021-09-16 01:09:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c906967149a34ff9029404cc531a2d34 SHA-1: 7bf4e3afba2ae290c0561eec889ddc58317c0b59 SHA-256: 260b8a038d4e91b0ce00219de499488437d1e9a8a4b8e7307ed76467c951ee92
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malicious content. The presence of a 'download button' heuristic further supports a lure-based attack. ClamAV detection and ML classification strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://garglob.ru/uplcv?utm_term=king%27s+throne+ios
    • http://austral-immo.com/userfiles/files/75855080582.pdf
    • https://vgi-vn.vn/app/webroot/img/files/gaweniv.pdf
    • https://atrax.eu/userfiles/file/60747413178.pdf
    • http://wych123.com/upload/files/vedagilidoxeg.pdf
    • http://domplus.su/userfiles/files/guwalinimujedetefi.pdf
    • http://uceng.net/_UploadFile/Images/file/19411918946.pdf
    • http://mprime.net/ckfinder/userfiles/files/83544860926.pdf
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/92da02822f9035447f0aed4161cddbcf/94216746367.pdf
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137d50546f11---57846071891.pdf
    • https://trystsalonri.com/images/file/doxamusa.pdf
    • https://szekszardportal.hu/userfiles/file/valimuvenopexuka.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140bb46d4cc7---remiz.pdf
    • http://botosani.ro/img/uploads/file/riziliwikowexolujavifemo.pdf
    • http://paraglider24.de/pics/fotos/1/file/kafamibalonuboxuweben.pdf
    • https://taevlingar.se/images/pages/file/87259796135.pdf
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/b7b96bc727f6e18ba395ba5b4847efab/renanaxudem.pdf
    • http://asiavent.com/UserFiles/file///gigon.pdf
    • https://sensiblemachines.com/ckfinder/core/connector/php/files/jiwanarepeg.pdf
    • http://eprdel.cz/userfiles/file/sogojuleposawaf.pdf
    • http://ambulatorioveterinariomariani.it/userfiles/files/gikilomavagosagaxavo.pdf
    • http://inhome360.ru/admin/ckfinder/userfiles/files/48593904233.pdf
    • http://jjw-led.com/userfiles/file/58463939134.pdf
    • https://texigo.tw/upfile/files/2021/09/07/xesofaniguxujumijababokus.pdf
    • http://armanetti.com/images/67579083792.pdf
    • http://laarakkers.com/ckfinder/userfiles/files/gupul.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b74f.bin
d8e136e957d3fce5367a8daf0561ce2851c201b41d04f617759054af728912cb
pdf-font-stream PDF embedded font (sfnt) at offset 0xB74F 10204 bytes
font_01_sfnt_off0000ce2b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCE2B 16792 bytes
font_02_sfnt_off0000e63d.bin
af7150c5bde23444117564379cac5d322263cb79e4ceb6b3b8529a71a26b7710
pdf-font-stream PDF embedded font (sfnt) at offset 0xE63D 17276 bytes