Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5e04e04e73cb2a9…

MALICIOUS

PDF

74.0 KB Created: 2021-09-01 00:09:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d84fe81c546706d2ebe2f3e620254524 SHA-1: 5cec8086602c4ff71498cc58ef3b11af8afb0b88 SHA-256: d5e04e04e73cb2a90c3a34c5f1810cbd73177c676dc7247fd7dc0b1db3318240
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress sites and other domains, likely serving as a distribution point for further malicious content or phishing lures. Although no scripts were extracted, the presence of multiple external URIs and the link farm structure strongly suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ac21593c9b5---31477394788.pdf In PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ctvtr4d0e658er2alcl228efk6/zugavivevovolijozosa.pdfIn PDF document text
    • https://maisonforville.be/documents/file/964261543.pdfIn PDF document text
    • https://boumqueur-edition.com/upload/fckeditor/file/xigebejuko.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608052bff36e3---vuvagaxofivelopi.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/bd222174c539d5556336a263f72d3c94/79277833217.pdfIn PDF document text
    • https://saunadlaciebie.pl/userfiles/file/69899094574.pdfIn PDF document text
    • https://badoza.net/userfiles/file/45590924772.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160f6ac661a2ad---rutadiwukirulelav.pdfIn PDF document text
    • http://cobbpaynefamilyreunion.com/clients/862770/File/rudonuwekor.pdfIn PDF document text
    • https://novzelandiya.ru/ckfinder/userfiles/files/5807737644.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/0726e8bee8852c8272545be53eb6157a/54533993191.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e8010d2c86e---97359996319.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/8b3pdt6dq136abu2levml4hfnv/27312377756.pdfIn PDF document text
    • https://www.acetechnology.co.in/wp-content/plugins/super-forms/uploads/php/files/9sovr9rtrml96la13lohvhld5r/50074853927.pdfIn PDF document text
    • https://mt-creativestudio.com/ckfinder/userfiles/files/5168387326.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608de082311e6---wakozazigulunima.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b342d90c540---rigimutanefuwelurejub.pdfIn PDF document text
    • http://dichvuhieuchuan.com/upload/files/55231267376.pdfIn PDF document text
    • https://ventadeterrenosurbanos.com/userfiles/file/duvojal.pdfIn PDF document text
    • https://ambalatender.com/upload/files/84211989569.pdfIn PDF document text
    • http://www.ufolep-69.com/contenus/files/sojulilatorakivesato.pdfIn PDF document text
    • http://22vek-omsk.ru/fck_editor_files/files/wugotimajalojuwagunapoxom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=personal+care+assistant+resumePDF 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_off0000bf5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d76d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD76D 16712 bytes
SHA-256: db2f0ca09ab59e0a9a32ef102523f53c27a78b554755fc4163852eecf088414f
font_02_sfnt_off0001028a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1028A 10492 bytes
SHA-256: 08409c69deb398e113fdcfc070e3f8b44bca1990750ab2d572793499b346b231

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