Malicious PDF — malware analysis report

Static analysis result for SHA-256 925e12b66d9aaf76…

MALICIOUS

PDF

86.3 KB Created: 2021-07-20 15:21:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3c6ecc27fd5522fc86c9568e490b2af8 SHA-1: eb5cc8f274e00f8c55865329b6e4d6d5b8cb6b37 SHA-256: 925e12b66d9aaf765cbd161e1cbb61c00b067febce2ebcb1802a5ada8ce800b4
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users. The presence of these links suggests an attempt to distribute phishing content or malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 http://av-jet.ru/userfiles/file/latevi.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/3c3857fb21d4d02a85341a9496b33081/24628041949.pdf
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/ljrt3d1cdmvdbt1029s6ep5716/76070091610.pdf
    • https://skatrip.com/basefile/skatripcom/files/bigokakinukubodefezedifez.pdf
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/16089e56936868---gegakep.pdf
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1607611e8ee207---genivibat.pdf
    • http://springhs1988.com/clients/a/a7/a70db2535ed58991dd9724faf9b165d0/File/sapisidazulemiv.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/2fea25823dbf92396a99c772f8f5914c/kixejulobupesod.pdf
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/e67eg4nuh6lv1j99lhaps7bnf0/gufeto.pdf
    • http://clase86marista.com/clients/25276/File/2306919808.pdf
    • http://cedule-plachty.cz/files/file/80867904783.pdf
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/16075be5dadebb---jebegovanatote.pdf
    • http://criollo-cocoa.com/userfiles/file/593274721.pdf
    • https://efnnma.org/files/file/libaxoro.pdf
    • http://perfekttorun.pl/pliki/68014321001.pdf
    • http://chineseclothingonline.net/File/4310329948.pdf
    • https://sportsslife.net/upload/ckfinder/files/67261190268.pdf
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/31ae904f205d4695509aa2e1305cdca6/nelodadatabizigikubi.pdf
    • https://kovosluzba-praha.cz/res/file/99164878834.pdf
    • http://doorsatyrau.com/ckfinder/userfiles/files/22839567718.pdf
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160d9b74a1284a---83357147276.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=pray+for+our+president+bible+verse
    • 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_off0000ef1c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF1C 16792 bytes
font_01_sfnt_off00010733.bin
f1f0af6d5c34b15de1d7af7e1b5afcec4787560101776100fa9772caae2fc7ed
pdf-font-stream PDF embedded font (sfnt) at offset 0x10733 10912 bytes
font_02_sfnt_off00012063.bin
0869aeecc4bb21a9e42e6019647da6121d01ed984f432c83fcec14aef53abd42
pdf-font-stream PDF embedded font (sfnt) at offset 0x12063 16868 bytes