Malicious PDF — malware analysis report

Static analysis result for SHA-256 64e370fe0eb37ada…

MALICIOUS

PDF

79.2 KB Created: 2021-07-09 06:01:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 7cef4a5aefa07d896be48004543e17bd SHA-1: d035cf31f16b9bf0bef072c5aae701be3546bd44 SHA-256: 64e370fe0eb37adae6d5dd857ba889a5e8948372e66d4469648496af60f83d6e
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a ML classifier and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to various websites, including those hosted on compromised WordPress installations. The primary purpose appears to be directing users to potentially malicious content or phishing sites through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://fitness-sport.it/userfiles/file/71211010105.pdf In PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c661294f759---20187527053.pdfIn PDF document text
    • https://noventa.cz/media/files/file/65698057388.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16097d5b5b6825---6416488686.pdfIn PDF document text
    • http://mega-stainlesssteel.com/uploads/image/files/10455466570.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/10856724970.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e782cef2890---nekese.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/47185218531.pdfIn PDF document text
    • https://raptiherbal.com/ckfinder/userfiles/files/17200299905.pdfIn PDF document text
    • http://patrick-jardinage.fr/ckfinder/userfiles/files/79706123548.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/j5endipeku35ru4gsuftdnhcl0/93996507609.pdfIn PDF document text
    • http://rdmsrl.it/userfiles/files/jododudajexebubanaxudixer.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/84819266331.pdfIn PDF document text
    • https://mojer.bg/files/motamoxidupuxuj.pdfIn PDF document text
    • https://mimpiindah2.com/contents//files/jovibaxiputagojadopeda.pdfIn PDF document text
    • http://parejalecaros.com/adjunto/upload/fck/files/lokibuxolubeduzamowivubag.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/512a1b91ceb6175e634ca75b2d9c97eb/43282182893.pdfIn PDF document text
    • http://brooklinehs1964.com/clients/6/6a/6a3559cec3eb17f551da2d864c8c85ab/File/kaliradojirugabi.pdfIn PDF document text
    • http://coinproject.com/userfiles/image/file/14623932262.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609c7906cc1f7---kewiwowodutadimuk.pdfIn PDF document text
    • https://nbtele.com/en/cache/fck_files/file/51662652132.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae22607aea---30090194212.pdfIn PDF document text
    • http://club-integra.ru/userfiles/file/6733302605.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160d7e0b71b386---mojepapafiwamepiz.pdfIn PDF document text
    • http://goergenpainting.com/clients/0/0d/0d1038892961fdbf96b6a8e7e8daca8f/File/30859426658.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/gafejir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=extraction+of+iron+metalPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2599fd89f7---91289297769.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_off0000d3f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3F9 10412 bytes
SHA-256: af56f241c5c222ab32f271639a51caa853dd73c2b6ac6b91d0460a2c39327d70
font_01_sfnt_off0000eb8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001039f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1039F 16328 bytes
SHA-256: f3e614710942439b25ced82c6cd4d291fb8bb476be12c952b2388540ab7052cb