Malicious PDF — malware analysis report

Static analysis result for SHA-256 37f45e9fc6a5c8c7…

MALICIOUS

PDF

75.0 KB Created: 2021-06-30 09:43:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c833d3f8af2b2c11843057cfcc06f009 SHA-1: ebb62bfbff256c5cf805c19c3559261bb8100202 SHA-256: 37f45e9fc6a5c8c7c6a6a540fae15e01385faece22ea4b0a1340482fdd30aebb
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. The file functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites. These links likely serve to redirect users to phishing or malware distribution sites, a common tactic for initial access via spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/idgm851ejv3ne6oa60ev3bjvvf/gobatubemow.pdf In PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b81ef4e4e6e---24532363344.pdfIn PDF document text
    • http://www.mustwalge.ee/data/content/files/natazobabikoros.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/5fcf0b223c9863530584501eee9211f3/zobebazodoneguvapomibumuk.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/8cbb466909439a25600316771362cd97/27735296918.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/mujufijabujepamemiloz.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1609c37d9b68e4---kujakemudekegafe.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/gosaj.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf4df15ab16---bipanobivi.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/51786844049.pdfIn PDF document text
    • http://energo-winstal.pl/userfiles/file/24120660060.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/pram116t5f4n581mimv10kuf1l/97259733996.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/90250536795.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/c90a7710c367ef3817676d1c00383e80/97886347173.pdfIn PDF document text
    • http://safarang.com/basefile/files/23901918375.pdfIn PDF document text
    • https://kildevangen.dk/files/mamuxojuf.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/135df70ab823d171a52c1c265e92c3b5/xotosas.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4c170436a26f0ef3759d5764847dbacc/45666342776.pdfIn PDF document text
    • http://www.johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/kepirowarozupajedavamupep.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/1082b39dddd47f2d772e85e34252a1be/gezopupudorewegixoguni.pdfIn PDF document text
    • http://askort.pl/Upload/file/77131864851.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5eeba3f7b---gewutadevixoviwalef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=how+do+i+know+who+called+me+when+my+phone+is+offPDF 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_off0000c338.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC338 16276 bytes
SHA-256: e6320837115a328ed41c10eea0cbdbd0005aab037a3ef481b01833c63c8f429f
font_01_sfnt_off0000ed46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED46 10968 bytes
SHA-256: 21344ae3d6f4361063b45e56be2ec8d6877b6be586d88d88b6b558fea00d0da4
font_02_sfnt_off00010682.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10682 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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