Malicious PDF — malware analysis report

Static analysis result for SHA-256 230db3ed3958f561…

MALICIOUS

PDF

73.5 KB Created: 2021-09-19 07:47:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: 2d222c6336e03341c4fa39e79a615ea3 SHA-1: 8ccc328bc72dfaf4d91c6ea18873fff27d2faf3e SHA-256: 230db3ed3958f561876400dcb1646e6e27b2c3a636727484083a14f19d6a18c9
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external resources, with a high-confidence heuristic indicating a link farm on disposable hosting. One of these links, http://veterinarioassociatopacinidallatorre.eu/userfiles/files/18609872807.pdf, is flagged as a random URL. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution via the linked PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://veterinarioassociatopacinidallatorre.eu/userfiles/files/18609872807.pdf In PDF document text
    • https://pracowniatechart.pl/fckpliki/file/gogunexifinonalavitemod.pdfIn PDF document text
    • http://bibliotekaludwin.pl/img/upload/files/sivatixuborodosex.pdfIn PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/57461963331.pdfIn PDF document text
    • http://chemtron-vostok.ru/media/file/53500940924.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc1428a399---weput.pdfIn PDF document text
    • http://sictombbi.fr/ckfinder/userfiles/files/28193567578.pdfIn PDF document text
    • http://cesurmakina.com/userfiles/file/27777159696.pdfIn PDF document text
    • https://profix.fr/ckfinder/userfiles/files/buduxusupudojipovanekex.pdfIn PDF document text
    • http://studiosantomauro.it/userfiles/files/9485689777.pdfIn PDF document text
    • http://sergeybazarov.ru/file/65693648617.pdfIn PDF document text
    • http://neilreardon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/41021176321.pdfIn PDF document text
    • http://tentimesneedlehill.com/UPFILE/userfiles/files/45320085683.pdfIn PDF document text
    • http://rotarycochinharbour.org/ci/userfiles/files/juvatakelavanupekubaret.pdfIn PDF document text
    • https://nffcd.org/userfiles/files/43504090196.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/rafifutamibopavipi.pdfIn PDF document text
    • https://tidaksusah.com/contents/files/6088815112.pdfIn PDF document text
    • https://censcakmu.org/board/file/files/getin.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/ff42ef0749f6b5ff0bf65c46b3fe5fd9/nigezutixaxapu.pdfIn PDF document text
    • https://vantainoidia.vn/ci/userfiles/files/vaposudedusibopurofukep.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/ce6c0ea58b01e178b1821281ea3f2bed/66416068113.pdfIn PDF document text
    • http://fanti-fitness.pl/uploads/assets/file/80373214060.pdfIn PDF document text
    • http://clingac.com/d/files/wudolo.pdfIn PDF document text
    • http://www.prunay-en-yvelines.fr/ckfinder/userfiles/files/xogisokujopemimab.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/k12j290bu35tu95bob4rf12pfh/60080436795.pdfIn PDF document text
    • http://ghinelliarchitettura.it/userfiles/files/sanixomulunove.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=dragon+ball+fierce+fighting+2.9+sin+flash+playerPDF 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_off0000b924.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB924 11368 bytes
SHA-256: 2006521c45ed73d8a811319b4a94ed0b9beaa7f8230bd2edc63b223bd7e0d508
font_01_sfnt_off0000d3be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ebd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD0 17188 bytes
SHA-256: 240ebe6b0b2db83b6f71e6bc23c79f6c3fedcc872f2443400a9c1242d8c4f92b

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