Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef6c4bf58f9ee096…

MALICIOUS

PDF

71.2 KB Created: 2021-09-03 06:52:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c2dcc6485b334807bdb83b6fc544d49a SHA-1: f29c1474ea44b41a3445a90baaf2a6f7cec27439 SHA-256: ef6c4bf58f9ee096fee2af45626887360ad74c84db8bfe4c5f4b21d7b2c7e29f
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm, with many URLs pointing to potentially compromised or disposable hosting. The ML classifier and ClamAV also identified it as malicious, specifically a phishing or trojan variant. The primary function appears to be directing users to external malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://alphabodysupplements.com/newerac2c/userfiles/file/86914309079.pdf In PDF document text
    • http://zeminyerkaplama.com/upload/ckfinder/files/991723291.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/29af0bd5b696d4db7965b7a1e5404887/50128296965.pdfIn PDF document text
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/23034140690.pdfIn PDF document text
    • http://seabeachthailand.com/UserFiles/file/20895250757.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/21030226277.pdfIn PDF document text
    • http://amctop.com/board_data/editor_img/file/202105250848.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c349c5e37---94533908385.pdfIn PDF document text
    • http://ritadas.in/userfiles/file/76363098167.pdfIn PDF document text
    • http://weberstellen.ch/userfiles/file/fuwepakoz.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/lgeh20hsuvq0ku62a9f8abc9m5/gudorujuzopa.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160a8562009bfe---jamitinajulefege.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/e2e5a18b6abf72336b355657d5b89937/97008852363.pdfIn PDF document text
    • http://guoyangmoju.com/userfiles/files/67466388180.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/27305e8b61733c120b467f87f6c9f8d2/madaxesipug.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cb683ecb797---63843388356.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c59ed72cc4b---99541493932.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/70978274564.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/40408832719.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608e79efe9078---lesegerikifazitotesafabul.pdfIn PDF document text
    • https://buddhaart.in/userfiles/file/ripowopanifad.pdfIn PDF document text
    • http://maszyny.pl/userfiles/file/21919945023.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=weight+watchers+book+pdfPDF 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_off0000b6bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6BC 15388 bytes
SHA-256: 139d6da947f8cc2f5d1053621a1fb5210756e539c5dd698addf26eeaba5c0af9
font_01_sfnt_off0000ddd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD9 11060 bytes
SHA-256: a7df93bac69b83c5a3cf64577056f41837cd2d00949c72a817a1f6fe32483a42
font_02_sfnt_off0000f76c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF76C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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