Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5ff0b1565c27f4d…

MALICIOUS

PDF

80.6 KB Created: 2021-09-19 00:44:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: dfc3d674cc581774ad740a958f400b11 SHA-1: 30c913913c949933bbe5286b8eaa907d777ff166 SHA-256: a5ff0b1565c27f4d910f81797c09b4b3bd1c86f8deed9c6d05524a88a12a80a3
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to lure users to external sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, and the document body was unreadable, limiting the analysis to the URL structure and heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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 http://fmi.lu/userfiles/files/govimezonemenagunus.pdf In PDF document text
    • http://makesomenoise.hu/upload/file/vakoted.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/xefelexoxavukuju.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/7b0a3be1b8514f8fb566def9a28cea76/besaxizesuvitelefew.pdfIn PDF document text
    • http://challendor.com/fckeditor/upload/file/14530088994.pdfIn PDF document text
    • http://meandnetworking.com/ckfinder/userfiles/files/denogofakekimojuj.pdfIn PDF document text
    • http://coaching-scolaire.net/userfiles/file/tezibuxori.pdfIn PDF document text
    • http://www.its-dph.cz/admin/fckeditor/editor/userfiles/file/laruvepatupu.pdfIn PDF document text
    • https://wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/xisimamopik.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/91784548082.pdfIn PDF document text
    • https://kawanmto.org/contents/files/nomadakugilivekamen.pdfIn PDF document text
    • http://vector-mebel.ru/uploads/files/fotunivipel.pdfIn PDF document text
    • https://ichapps.com/ichapps/ckeditor-ckfinder-integration/uploads/files/kezavakiwisewizirik.pdfIn PDF document text
    • https://ncltandatbar.com/home/ncltandat/public_html/dowalumniusa/ckfinder/userfiles/files/11652838093.pdfIn PDF document text
    • http://recviem.ru/img/upload/5088324730.pdfIn PDF document text
    • http://schokoladenbrunnen.de/idata/tadoxejonififetefufasupe.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9e1858ca5---48187018363.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/a77177438cc831386ce06886e856e1e7/rifabakilugajade.pdfIn PDF document text
    • https://cbconsulting112.ca/userfiles/files/samufobofez.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/bikgvog9oqd89dp6uoh29r2r9n/47146277501.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd642ddd6d---5904239751.pdfIn PDF document text
    • http://analhospital.net/file/files/79824242424.pdfIn PDF document text
    • http://vigova.vn/Images_upload/files/44009276986.pdfIn PDF document text
    • https://www.uflo.edu.ar/ckfinder/archivos/documentos/xidik.pdfIn PDF document text
    • http://psychologadamczak.pl/userfiles/file/xigojepun.pdfIn PDF document text
    • http://ericshartman.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mofiko.pdfIn PDF document text
    • http://maudchristan.nl/ckfinder/userfiles/files/2962694828.pdfIn PDF document text
    • http://bortran.com/upload/image/file/20210914104337.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=number+hack+apkPDF 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_off0000d5f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F8 10320 bytes
SHA-256: 110fd68707d27c0b528beb6ca59247805ea54b3b9b3b3db8e97f6e6239517329
font_01_sfnt_off0000ecf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF9 18340 bytes
SHA-256: 3e4ced5723ba74b68afb78bd2720254e93378850b362beb3b116b7ce48e6d937
font_02_sfnt_off00011cc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1