Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef34eb9a5873807a…

MALICIOUS

PDF

75.4 KB Created: 2021-09-05 16:32:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 85a5f47547c68486f44d325938fd0505 SHA-1: 7b7873357e4ac5e7bd3d691a88e056b54aa157da SHA-256: ef34eb9a5873807a771fe31a1477dbe114ff77a1855ba4708d461a5639b27beb
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 heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and potentially disposable hosting. This suggests a phishing or malware distribution scheme, where users are lured to click links that could lead to further compromise.

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://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/25c6kd79fgtm652e7bcqp9sjk1/80206512281.pdf In PDF document text
    • http://dsm-trhs68.com/clients/8/81/818e764d3414495a915a5f66638dc9bf/File/kadevojuvevukateminujevib.pdfIn PDF document text
    • http://cloverdiamond.com/file/repop.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/p2q6nkp6b8ajachmg3m7hfu100/17953885460.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160f51f45b8656---gipuwosijepo.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b8142274ebf---satarefudupumibos.pdfIn PDF document text
    • http://steps4cancer.org/clients/a/a7/a78c374070a178914b502abaf3db82b8/File/xanuwapuzipibunapasuxodi.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/3ca273886818b564f913919d701ef347/64667965027.pdfIn PDF document text
    • https://2-view.org/home/view/public_html/ckfinder/userfiles/files/1178033425.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b1f1e3ccbb3---xemizuki.pdfIn PDF document text
    • https://drsaman.com/files/wimagefikazirojol.pdfIn PDF document text
    • http://universalestetic.com/userfiles/file/7544834448.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/9d7415efaa65c60e2b2a77dc714a3ec4/9639622291.pdfIn PDF document text
    • https://xn--hjrnskadeakademien-mtb.se/userfiles/file/mawufovaj.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/68915002659.pdfIn PDF document text
    • http://ginzaramen.us/uploads/files/wutopemadinanetofobuzizob.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb05e1eec6---97615558143.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/111f5fd9674498285f637155967277e5/vagedemisarogeli.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bce8268674---kozalumogix.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fec25671ae---465967750.pdfIn PDF document text
    • http://mesahighclassof64.com/clients/874441/File/86452452879.pdfIn PDF document text
    • http://baovevietnam-vnss.com/upload/file/51147462156.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=ielts+the+vocabulary+files+c2+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_off0000badc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBADC 11104 bytes
SHA-256: 51e88d2a245cae8b374787beb26ffabb2dd6fa0a3f4f65063e8469c8c8e62915
font_01_sfnt_off0000d4ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ecdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECDC 19872 bytes
SHA-256: 31af85acbe311dcd5d9f7447a788ee8a0bf4bf79cfcc2047ff736ad4abd24b10

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