Malicious PDF — malware analysis report

Static analysis result for SHA-256 488ee08da375eb34…

MALICIOUS

PDF

80.5 KB Created: 2021-09-03 06:07:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 77b234592778364deba5f3940572dc12 SHA-1: cb53b9ad3574c6a2001489e1fc56ffb984112116 SHA-256: 488ee08da375eb3472be3d37d9a4fd077538d46916efc9ec0da9284308c41737
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV detecting it as Pdf.Phishing.Trojan. The file contains numerous links pointing to compromised CMS uploads and disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious content. The primary attack pattern involves leveraging these external links for phishing or malware delivery.

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://crewmak.ru/uplcv?utm_term=how+to+drive+a+car+pdf+download PDF link annotation
    • http://dollreunion2020.com/clients/4/43/4392dc7a9e9236654a628da0af121bbb/File/71231507464.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/duvejimugoxowurikerebupix.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/c5d2194cc838bb44c33b04759fa438b5/vawijezunep.pdfIn PDF document text
    • http://myexamadvisor.com/fck_uploads/files/83644755488.pdfIn PDF document text
    • http://donleroy.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wugonebepopajupenafarujim.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee7669bf85---musawanajudomukufu.pdfIn PDF document text
    • https://247hvac.ca/fabulous1/uploads/files/jezutexo.pdfIn PDF document text
    • http://www.parkwaytransplant.com/media_upload/upload/files/dedogivu.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611f7d57d34d1---lonurepipaviboxisesofav.pdfIn PDF document text
    • http://www.rpv-drachten.nl/files/file/79761419384.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d26d7b6a990---58068871517.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/16084846464c9a---wijiwineronuzosifa.pdfIn PDF document text
    • https://bozoklar.org/ckfinder/userfiles/files/dejuteta.pdfIn PDF document text
    • http://richfield1962.com/clients/4/47/47516dc9824f3897220912ef171c404f/File/26666904856.pdfIn PDF document text
    • http://xn--9i1b14lwsg1seumdzsx.com/upload/fckeditor/file/57776213008.pdfIn PDF document text
    • http://naasschoolofmotoring.com/fckeditor/userfiles/file/6650439535.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/b09cc550909d8bfe3b3ef390873c96f8/60553075491.pdfIn PDF document text
    • http://clubsahdianagalati.ro/upload/editor/file/70358523802.pdfIn PDF document text
    • https://itchanoi.vn/uploads/news_file/97492201709.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/765825fdede8e562d8fcf3856c0b593f/75131545460.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d43ac894ca---53061325876.pdfIn PDF document text
    • http://reklamavysocina.cz/UserFiles/File/90712157554.pdfIn PDF document text
    • https://mbbs.hr/files/52519979889.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_off0000d528.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD528 10588 bytes
SHA-256: 1253db46a3dff0c460d721a99beb32fabc7dfaa14bc863ad1a5c8c42e9c255f0
font_01_sfnt_off0000ed70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010582.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10582 18040 bytes
SHA-256: 79c221fcc36fd2c6230d06ce100a9748f7214f7ab635fc75c48e6fe118486e03

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