Malicious PDF — malware analysis report

Static analysis result for SHA-256 40bcb46162be2f01…

MALICIOUS

PDF

81.5 KB Created: 2021-09-19 00:42:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 9f38d718a1b8e972e69d59291c6ce7e2 SHA-1: 84600d3fb52389a71967fd6ff67a696026af53fc SHA-256: 40bcb46162be2f01897792053722a20b996e99d138327723dba5a63ea5f5beeb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest a malicious intent to redirect users to potentially harmful content. The ML classifier and ClamAV detection further confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://hondamienbac.vn/userfiles/file/molezodiv.pdf In PDF document text
    • http://banghetretunhien.com/media/ftp/file/28601530962.pdfIn PDF document text
    • https://intersat.lv/files/file/vonadivorivezevavotenup.pdfIn PDF document text
    • http://hglobaltour.com/FileData/ckfinder/files/20210912_CECDDB820CEA6E95.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/seduxonoxixarujawoworozaz.pdfIn PDF document text
    • https://cfbadalona.net/ckdata/files/ropekabupipabuzodefizexe.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142fb9c01b05---35082777000.pdfIn PDF document text
    • https://thuaphatlaihanoi.net/uploads/files/ladom.pdfIn PDF document text
    • http://bouwbedrijfansing.nl/userfiles/file/1012423832.pdfIn PDF document text
    • http://muasamhangmy.com/ckfinder/userfiles/files/30369827449.pdfIn PDF document text
    • https://go2germany.ru/files/file/lolodeziven.pdfIn PDF document text
    • http://osayit.com/images/file/gajekagi.pdfIn PDF document text
    • https://codefon.hu/js/ckfinder/userfiles/files/50277714942.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee4b09887a---pejesuleginoduralen.pdfIn PDF document text
    • http://casavacanzesanvito.eu/userfiles/files/57660927772.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/872nccbk472t79suo1m7fv8hgd/44876529778.pdfIn PDF document text
    • https://renebeumer.nl/userfiles/file/nebobixibeganij.pdfIn PDF document text
    • http://poultech.net/d/files/93649373505.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1614654dc409ab---wowipo.pdfIn PDF document text
    • http://montpellier-businessplan.com/mbp/upload/images/images/upload/ckfinder/98708144810.pdfIn PDF document text
    • http://movesearchesuk.com/userfiles/file/59299724858.pdfIn PDF document text
    • http://www.palmettoexpresslanes.com/system/js/back/ckfinder/userfiles/files/tetalaxorudejifegasopakod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=2020+ppsspp+gamesPDF 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_off0000dd05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD05 10180 bytes
SHA-256: 8f89d12c4b5f41bde75196b2bd34ba378c9d13555a59fd060b29901d0bd3bdaf
font_01_sfnt_off0000f3e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010bf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF7 17248 bytes
SHA-256: a8350d463bea265082d1d0c3d8ecad86a949a4b89b1e9bf8e15e0c6a7d2124d0

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