Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac955ab10638050d…

MALICIOUS

PDF

79.4 KB Created: 2021-08-04 17:05:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a7c9694e49b8efff99013925b1ae99c8 SHA-1: 7fa3bbc44f4a7ee10ffa28f7aee156df637e9755 SHA-256: ac955ab10638050df95ef6e206c5c97e93aecff1242ff24d35096f030572f50b
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that point to compromised WordPress upload storage and other disposable hosting sites. The presence of these links suggests an attempt to lure users to malicious or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://catamma.ru/uplcv?utm_term=vestil+pallet+jack+parts+manual
    • http://coffee33.ru/archive/file/21378706527.pdf
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609441d380d3f---77579355479.pdf
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607cea811e8d9---57242061224.pdf
    • http://ekolojikweb.net/upld/userfiles/file/52179042000.pdf
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/3ac653792b32487e085a9f99bd3fb06a/mibidiwidanixakozu.pdf
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609add40518b6---68221787118.pdf
    • http://fogathajtohirek.hu/fckfiles/file/61617271329.pdf
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1606c87ec286dc---80947998967.pdf
    • http://chiengthai.com/file_media/file_image/file/20144267708.pdf
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/e08003b43ce7b9fa31675f3feb5c487a/71086529657.pdf
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/ks13o078ad9gtaol22uv39ood1/95158308296.pdf
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a84b19df069---gunugowanorawozumoguxalul.pdf
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16098cefd4888d---14173824561.pdf
    • http://wadsoda.com/UserFiles/File/zitusovamomogusijapasu.pdf
    • https://astek-telem.fr/userfiles/file/66433755888.pdf
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2617d3616---84618033951.pdf
    • http://clinicoral.com/img/userfiles/files/xenefunegitafonesezofu.pdf
    • http://xn--szabowski-tub.pl/userfiles/file/38100285958.pdf
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe92ad1e90---15459040732.pdf
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/5c6833f5c4c982536ed2697592ee8cae/65118695826.pdf
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c5d50f6ae9b---teribefelowiluwuvezanij.pdf
    • http://builderall.info/userfiles/file/kobejetelunelisavalak.pdf
    • http://srub-servis.ru/userfiles/file/jegeguniwexuzulogo.pdf
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c86e01cde16---64711262590.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d284.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD284 16792 bytes
font_01_sfnt_off0000ea9b.bin
4ea22e80a0687e2872b8849b6d9d7cbc68c14330808e7cbcdfd132e7e9918bdc
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA9B 10704 bytes
font_02_sfnt_off00010321.bin
df93b03031a5e5994534ba9d461be5571a09af1f82abb4ec11733174f908471b
pdf-font-stream PDF embedded font (sfnt) at offset 0x10321 16968 bytes