Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d8b0462e06ca50e…

MALICIOUS

PDF

70.3 KB Created: 2021-09-27 04:01:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 92cdaa755e73e3d6545307fffa98a5f2 SHA-1: 918c7d1b2c2d1a68bca3e9ea95572c14d5a8e90a SHA-256: 2d8b0462e06ca50e0a47aad96f7788134ce8a4409fa638b942615469b4ae29c2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these link farms and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://crewmak.ru/uplcv?utm_term=punjabi+movie+app+download
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/6d5ebf4979bcee576aeacc77c2f38966/89470054622.pdf
    • https://callmarkinvestments.com/callmark/files/66763412057.pdf
    • http://tokyoto.pl/UserFiles/file/zorojadamufajivabopu.pdf
    • https://marbeyoyun.com/calisma2/files/uploads/47051378289.pdf
    • https://snapstudios.ca/userfiles/file/zapufewatigoberal.pdf
    • http://www.ags-sib.ru/ckfinder/userfiles/files/31179549466.pdf
    • http://nextlab-semi.com/files/fckeditor/file/71800885059.pdf
    • http://my-glc.com/uploads/file/rojidivonopimobejefepukiv.pdf
    • http://forter.vn/hinhanh/file/9584979606.pdf
    • http://studioindelicato.com/userfiles/files/fudogesasoru.pdf
    • https://flcevent.fcu.edu.tw/plugin/ce1/ckfinder/userfiles/files/20210904203256.pdf
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/6737656c0d407c8640178f0f822325e8/favavijabap.pdf
    • http://polyacer-ecp.com/userfiles/files/20210903_164522.pdf
    • http://pnmanagementsolutions.in/uploads/65935979826.pdf
    • http://polaryachtmanufactory.com/res/wysiwyg/file/40493081622.pdf
    • https://parisnordmedical.fr/docs/file/268326826.pdf
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/4a1479930977e63722782771d0c74338/kibowabe.pdf
    • http://4seasonstours.in/userfiles/file/gezenaru.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/d87sgc9jlg6qc0pic0fobdldg4/44920591077.pdf
    • https://gimenezricarte-deltabogados.com/ckfinder/userfiles/files/20416469490.pdf
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/77775012959.pdf
    • http://kemenyseprosiklos.hu/upload/file/46640101969.pdf
    • https://trompis-tondschungel.de/userfiles/file/posenisatufopururikin.pdf
    • https://adian.eus/files/galeria/files/netuwug.pdf
    • https://soroptimist.be/oldsite/intranet/ckeditor/ckfinder/userfiles/images/files/resujaxizavedeb.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_off0000b20a.bin
97b228c92a415b5b1188bd3af1bf7ea3524c0de8d36f2c578ab0a1e86ff8c000
pdf-font-stream PDF embedded font (sfnt) at offset 0xB20A 16248 bytes
font_01_sfnt_off0000db2c.bin
2cb7bf331969eba15b119a33f302fb5a566095a1eb42727bd9405341c07b465a
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB2C 10708 bytes
font_02_sfnt_off0000f379.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF379 16792 bytes