Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e6fe7c4f461d0f4…

MALICIOUS

PDF

82.0 KB Created: 2021-09-17 03:04:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 14c7a527ffff547fe2df9e4282c23f26 SHA-1: a534beaf46d6dbf162fdd25aae2c9464edf4fb38 SHA-256: 1e6fe7c4f461d0f4bcdbe5a598d5c796d22be35f591bf8941c655aa0aae68cf8
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1204.002 User Execution: Malicious File

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a remote-support tool lure and a callback phishing lure. It contains numerous links to external websites, many of which appear to be part of a link farm hosted on potentially compromised or disposable domains, suggesting an attempt to redirect users to malicious content or download sites. The primary goal appears to be tricking the user into installing or interacting with remote support tools or calling a fraudulent number.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://synerhu.ru/uplcv?utm_term=imo+download+for+mobile+android PDF link annotation
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1613f96bebeedd---78056530086.pdfIn PDF document text
    • http://studiodugnani.it/userfiles/files/rasedasifuditomit.pdfIn PDF document text
    • http://gonzagafood.com/userfiles/files/gudemof.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/fujekikojonaxi.pdfIn PDF document text
    • http://tootingtaxi.com/survey/userfiles/files/67676818390.pdfIn PDF document text
    • http://etkindenetim.com/resimler/files/vuluj.pdfIn PDF document text
    • http://pizzeriadevita.it/userfiles/files/62680502615.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1614020c6ce507---padok.pdfIn PDF document text
    • http://dongamold.com/fckeditor/upload_files/file/gixodudokudigazuf.pdfIn PDF document text
    • https://on-call-anatomist.org/ckfinder/userfiles/files/15644472228.pdfIn PDF document text
    • http://topbuild.net/content/xuploadimages/file/21959401580.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613131dfcd9d2---29514150852.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/wekokudakun.pdfIn PDF document text
    • https://drivetripper.com/userfiles2020/files/wetorevopekefakogas.pdfIn PDF document text
    • https://kalitelivideoizle.com/resimler/files/14175159505.pdfIn PDF document text
    • https://rmp-traueranzeigen.de/cms/files/perezo.pdfIn PDF document text
    • http://aristosaigonhotel.vn/uploads/files/11093091679.pdfIn PDF document text
    • https://wolfgang-photography.com/userfiles/files/62743451008.pdfIn PDF document text
    • http://www.lircai.com/web/inline/file/92137818077.pdfIn PDF document text
    • http://ch-bovi.com/upload/files/51920056549.pdfIn PDF document text
    • http://tranindo.com/Uploads/userfiles/files/mujepajexi.pdfIn PDF document text
    • http://ingmarcofaedi.com/userfiles/files/kolukisixu.pdfIn PDF document text
    • http://yourtruck.be/upload/ckeditor/file/nufefuta.pdfIn PDF document text
    • https://zenit-npk.ru/files/file/bipisixuwajelifajipipid.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_off0000dcdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCDF 17820 bytes
SHA-256: ae75bba33ebbff31c201b49c222ab0828211b76143695ad6221c6f2cd4ca5078
font_01_sfnt_off00010a94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A94 10424 bytes
SHA-256: 5969d4d4db24328f6e0ba39a1cfcd0b52322226a1d350ec55f9a55229b182e34
font_02_sfnt_off00012222.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12222 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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