Malicious PDF — malware analysis report

Static analysis result for SHA-256 4826ce0771c7505a…

MALICIOUS

PDF

89.2 KB Created: 2021-09-06 21:23:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f3a564e8572dcacaf5b537de215c8338 SHA-1: a98b5b6ff552acdd92e7dd50d44c9e3ac54f821e SHA-256: 4826ce0771c7505aceb0c96fe081c310081bf2a91b676dbe3b1f9a88d955250f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous embedded URLs pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URI indicators and the overall structure point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://allytemp.ru/uplcv?utm_term=practice+advisory+for+preanesthesia+evaluation+pdf PDF link annotation
    • http://kunbot.com/upload/files/wakizu.pdfIn PDF document text
    • http://teaandtiara.ca/clients/c/cf/cffd5a667a547ddf6f7ed7e454f715b7/File/sewaxexuxorati.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/uq6e7nscb4dln9g8f2ea8te9sc/molen.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160acf15f634f6---14956369621.pdfIn PDF document text
    • http://metrokentakifinan.com/resimler/files/vejilebalupijusuxibigoje.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/41dc0301fd5c3322f5810f103e9ec78a/pobotitudirunuvapusapaket.pdfIn PDF document text
    • http://autosklo.sk/pictures/file/30791005560.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b34a9175997---37288908380.pdfIn PDF document text
    • http://metall-press.ru/files/polawobijemazutexeta.pdfIn PDF document text
    • http://vagtteam.dk/userfiles/Files/worisafutibariweleroxek.pdfIn PDF document text
    • https://yar-net.ru/userfiles/file/bogalidumaxawulevoxinomiv.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1ed79ebb2---13801408535.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fda713eb757---romujik.pdfIn PDF document text
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16079973ed73a5---telodumuxupod.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/31055999140.pdfIn PDF document text
    • https://aduanaldelvalle.mx/userfiles/file/50242625037.pdfIn PDF document text
    • http://revucue.com/ckfinder/userfiles/files/40270309901.pdfIn PDF document text
    • http://akpanlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rojazig.pdfIn PDF document text
    • https://ev-owners.jp/userfiles//files/84415010260.pdfIn PDF document text
    • http://surveycook.com/upload/tmp/202108/file/78035877488.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606e7f1165f02---radixi.pdfIn PDF document text
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/fad5703b76f226cd2b8e72fc412fd55f/zefilotetomipaberirivodoj.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_off0000f766.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF766 17580 bytes
SHA-256: 5689a349dc469cc2ed5ea3f103ed93aa9b2e5913f603cb4ee2a04038020dce53
font_01_sfnt_off0001256a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1256A 11000 bytes
SHA-256: 742453082bf508ba2986b77bd89283ff4f8ef71377fa1c636a3232ef18602ee5
font_02_sfnt_off00013ef6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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