Malicious PDF — malware analysis report

Static analysis result for SHA-256 373111da2d4da87d…

MALICIOUS

PDF

88.4 KB Created: 2021-07-07 05:18:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: a613a347bf7c88015ac6c210fed64b9e SHA-1: e3634cbbb87bf9f8130559a1ef906f6815798fef SHA-256: 373111da2d4da87d4210ec5a06a6fe9e7e4f57f88d9d235fe3a229ec41eabb27
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous URLs pointing to compromised CMS upload directories. These links likely serve as lures to download further malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://craftsmancuttingdies.com/wp-content/plugins/super-forms/uploads/php/files/991474bc922b971cb22da9997484a338/sexotojadinedabaxavevom.pdf In PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16097a0bc11aea---33716783743.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a62691b28ff---sivamifor.pdfIn PDF document text
    • http://lapawan15.com/shop/fck_file/file/19997743856.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/kufumozijumikanunata.pdfIn PDF document text
    • http://www.sanruou.com/app/webroot/uploads/files/99219807274.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/qfsjkloid8ep4l52l5a3klqthf/53680671710.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/12d749bd2fcc4d0e5e535f19c72591c6/woxep.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/31567156928.pdfIn PDF document text
    • http://elandtour.com/FileData/ckfinder/files/20210702_BD30AA119C4B0C6D.pdfIn PDF document text
    • http://koopmankennedyfeller.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/32385924025.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160833e45928d3---13348058140.pdfIn PDF document text
    • http://dynamic1984.com/user_file/file/xerol.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/b2df23a56140304e6d4bb50f5162124e/70149097176.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160d9fd0b16d70---wuludowapawapipogogu.pdfIn PDF document text
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/bogogewejonuwixasepon.pdfIn PDF document text
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/gfd9pniqlemvv66jmh2j0t8vhc/xedup.pdfIn PDF document text
    • http://magnachip.cn/userfiles/file/20210512050014.pdfIn PDF document text
    • http://giustizianuova.it/userfiles/file/26000121864.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/207b519742720913c3f5151c6762a6ad/pelelivo.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/a458264c90ccb2b6bd52a4c76aaee7d5/bazavotev.pdfIn PDF document text
    • http://turatabor.hu/media/repimezebulizodisev.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099e9f3755d4---19547005368.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210512033143170.pdfIn PDF document text
    • http://bonapartefamilynetwork.com/clients/7/7d/7d081654635712149502d88e72c54c2d/File/49134748319.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=biomass+energy+pros+and+consPDF 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_off0000f5ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AC 17532 bytes
SHA-256: 28e815111a743cbd2d739ebb29e4e3905620599dea5ef023fab637129b494b58
font_01_sfnt_off00012330.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12330 10880 bytes
SHA-256: 1539173effbb03048392c6c95a240607037585361765e5273e04693297804432
font_02_sfnt_off00013c26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1