Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbf480b546b3d29c…

MALICIOUS

PDF

74.2 KB Created: 2021-09-03 10:29:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2badbc8159eccd21f0e5ae190473380d SHA-1: a8570a355ce5877bca9dac3ba466c41d8e42b981 SHA-256: fbf480b546b3d29c81e48f82296d8442bb4c1088b60ab913d2af2646cea04024
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm to redirect users to malicious content. The presence of external URIs and compromised CMS upload links strongly suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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 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://queure.ru/uplcv?utm_term=ge+gde25eskss+manual PDF link annotation
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16084e2b819e85---75006563710.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/r8ds2a8i37sf296uf6o6fhi6bh/98440055196.pdfIn PDF document text
    • https://vestol.bg/files/file/dokerixotilusewus.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/87fe2e1e1239ac33dd389b872e05bcce/kexividoj.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/womarotajimidigekasurebu.pdfIn PDF document text
    • http://granitemountainranch.net/userimages/56612612869.pdfIn PDF document text
    • http://mauchlineware.com/html/chapelstreet/web/userfiles/files/72930190394.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b3dca86db20---garuziwujinogowavubemado.pdfIn PDF document text
    • http://chanakyaaerospacedefence.com/userfiles/file/sejiwiboxapi.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/sixepokugexajikofub.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/16093faeb46aeb---2434188328.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1e736993a---48655181698.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/ga2cvtlhvf08qsnc1be3c4rvrg/92061619062.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612d577464555---semadopuvojakezo.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608b57cdc4b95---vetimuxedonu.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/57905117a26890d8e381368e6296e6d8/monipuxur.pdfIn PDF document text
    • http://sportgalaktik.sk/userfiles/file/fomox.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072888fbbb98---91707216256.pdfIn PDF document text
    • https://rubin2000-distribuitorshop.ro/userfiles/file/68886386508.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ec97743e6d6---dininepusofirapusufekixo.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1608826d221f38---tugefazenenirupiw.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/bfajf57ebnt8jekp2bulib6r7d/vetopuzakabamaguzajebe.pdfIn PDF document text
    • http://paddockj.com/user_data/editor/ckfinder/core/connector/php/upload/files/26421482402.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160842ac550103---pewokilemigimomibetek.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_off0000c169.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC169 10664 bytes
SHA-256: a411fd332a5bc5d3129da364bbcb44853265524972d6be8f43c48b7f81e3c6ed
font_01_sfnt_off0000d9b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f1c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C9 15752 bytes
SHA-256: d85026ef87dc8e5c816ac99ce0ddc4f6a2d22090ec48c85f60ae9a9eea43897d

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