Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4f4c42e6b100644…

MALICIOUS

PDF

77.6 KB Created: 2021-09-07 05:50:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b8d2b18e74b7df45dc18ceb588086188 SHA-1: 0aca1b032bfafc592617cb858fdc9e036fefeb5e SHA-256: f4f4c42e6b100644aeab886a9250f2647e3b36468c5369203c9e807622e390f2
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it likely serves as a phishing lure or malware distribution point. The heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM firings strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://phoenixturkey.com/upload/ckfinder/files/74774850507.pdf In PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/zenutimejaduditapifonibil.pdfIn PDF document text
    • http://omak1968.com/clients/71178/File/lararesesu.pdfIn PDF document text
    • http://gilbertthomasreunion.com/clients/5/5f/5f56fe696be94dde62972871c8a9bc28/File/79002702352.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608d0a4f91232---95876215034.pdfIn PDF document text
    • http://livingkaneohe.com/userimages/45183994495.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160ac58cd320ef---73704810325.pdfIn PDF document text
    • http://www.srijonihealinghome.com/fckimages/file/12102287546.pdfIn PDF document text
    • http://thanuyentea.com/ckfinder/userfiles/files/bagugazegerofebaf.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/e6a6e5776c5194fdcc5cf09c8e87e4c3/pewemikonutevesa.pdfIn PDF document text
    • http://d4smontreal.com/clients/f/f5/f58105ca183540932673f5bf18e62671/File/49730827914.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/nibatapatori.pdfIn PDF document text
    • http://anipetkingdom.com/webroot/img/files/lidugemisobaxateve.pdfIn PDF document text
    • https://eliteplacementagency.com/uploads/files/9952992601.pdfIn PDF document text
    • https://cfi-registration.org/buzzboxgift/img/userfiles/files/81576325233.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/dt6qamhvvr2hhmid7red5kgju3/pabemapomadujanoz.pdfIn PDF document text
    • https://postelezmasivu-olomouc.cz/ckfinder/userfiles/files/zexugikajijotin.pdfIn PDF document text
    • http://polimak.pl/userfiles/file/wezime.pdfIn PDF document text
    • http://ingfrimale.com/userfiles/files/43805849300.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4a2996f5d---98558148075.pdfIn PDF document text
    • http://studiofagiani.eu/userfiles/files/xumusewijorumobabovetu.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/21895480102.pdfIn PDF document text
    • https://baobihungphu.com/media/ftp/file/biwasoxegidowuwogi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=mitternachtsformel+herleitung+pdfPDF 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_off0000c547.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC547 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD5E 11160 bytes
SHA-256: c46be4671990e218b3bd9d283bdc15b72f6245cf524d3bad6dfd7a1f399b6f50
font_02_sfnt_off0000f708.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF708 19332 bytes
SHA-256: beeb1207555b8a44d8dcde43975d07dd7f4f2656d690dad17ca8ae358a232a71

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