Malicious PDF — malware analysis report

Static analysis result for SHA-256 fab7da536094891b…

MALICIOUS

PDF

94.6 KB Created: 2021-09-24 03:49:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 453341c274e52592786484393aa5dc66 SHA-1: e0204fb0b9650b164b0e15aace80e53cf3930c84 SHA-256: fab7da536094891bd96e7e8bcd838f38be76a01bf78ca8a3396694cac6d82c6b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution intent. It contains numerous embedded URLs pointing to various domains, many of which are hosted on compromised CMS platforms or disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of link farm techniques further supports this. No scripts were extracted, but the overall structure and URL distribution strongly suggest a phishing or malware delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://oniceh.ru/uplcv?utm_term=accounting+basics+crossword+puzzle+answers+pdf PDF link annotation
    • https://desco.scp.hr/files/95147469157.pdfIn PDF document text
    • http://businessplan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/dojezejotanoruva.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/161401c3e04131---11617748143.pdfIn PDF document text
    • https://llbyggodesign.se/UserFiles/files/14701982350.pdfIn PDF document text
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gagekebukefoxidudifex.pdfIn PDF document text
    • https://tannhatviet.vn/upload/files/ruzuz.pdfIn PDF document text
    • http://gabinetpro.gabinetpro.pl/kosmetyczka/krakow/files/42290831525.pdfIn PDF document text
    • http://immodraft.de/images/architekten_agentur_images_/file/vabevasukoruvakewekafebi.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614af07f47694---26897664056.pdfIn PDF document text
    • http://goforthegreengolfpools.com/userfiles/file/10473562055.pdfIn PDF document text
    • https://vicotelecom.vn/static/source/images/file/duximawolixanimimilutav.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/1cbb46862ebfbb5f03d51da1a6cf4872/2175580239.pdfIn PDF document text
    • http://brava-ekb.ru/userfiles/file/fetiludeluwe.pdfIn PDF document text
    • https://heuresromantiques.com/upload/files/dekaxaminitoreje.pdfIn PDF document text
    • http://massimosusto.eu/userfiles/files/xumefadikobarajixoka.pdfIn PDF document text
    • http://foodchemsino.com/d/files/2823267778.pdfIn PDF document text
    • http://abcbyspu.net/ckfinder/images_store/files/27748737212.pdfIn PDF document text
    • http://easy-sleep24.de/shop/images/editorfiles/file/48018663288.pdfIn PDF document text
    • http://janjoling.com/public/ckfinder/userfiles/files/rexuzug.pdfIn PDF document text
    • http://ecoaga.com/documentos/file/fitazipebejopobubugobeko.pdfIn PDF document text
    • http://patp1ryb.ru/media/file/3130488409.pdfIn PDF document text
    • http://mojahotels.com/ckfinder/userfiles/files/88774136436.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/pabosojibemitugeguz.pdfIn PDF document text
    • http://yugreat.com/filespath/files/20210904080053.pdfIn PDF document text
    • http://szerecsen.hu/editor_up/18250265909.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_off000105ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105EF 19848 bytes
SHA-256: eaccc9c5f822fbaaeb27bb71686ff615d408d06f0f5f51f3bb62c526734cd622
font_01_sfnt_off000139fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015214.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15214 11160 bytes
SHA-256: 0f99d0465feb93013842c70df6b61f2f44d7016a1e11af212377f0a09b708bb9

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