Malicious PDF — malware analysis report

Static analysis result for SHA-256 90cea77172c2c3af…

MALICIOUS

PDF

85.0 KB Created: 2021-07-07 01:57:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 411df950c55e1c39c4eccd67eebe2d20 SHA-1: 5a202e6e76defc8d8fbc8b5023fdd81ebd637091 SHA-256: 90cea77172c2c3afa26bd0ac59dbb3e274ed3d875d3db960f09814a68267b6be
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 URLs pointing to compromised WordPress sites, suggesting an attempt to redirect users to phishing or malware distribution sites. Although no scripts were explicitly extracted, the nature of the link farm and the PDF format itself often leverage embedded JavaScript for redirection, hence the inclusion of T1059.007.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://arket.io/wp-content/plugins/super-forms/uploads/php/files/gp13ca8bp1kgg6f668ghoeob0r/14494734409.pdf In PDF document text
    • http://pronobile.de/catalog/file/wokusuf.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9795281d3c---vikazatu.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/a3742e4e68e81bd65cf38908df6bd301/22820852353.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/60cl1bttqeebom39gf8sca3434/90400263773.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/eoiod5h5vj8kei9u8ciapt9d9i/rojapukotulanodu.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/vavenoginazeri.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/e03e236a5d211f97fc1fa575bc918a15/12331807510.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/2gf6c1icf3ibvso2io2o5fl661/lobodotoxewirekel.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086d40d7235c---digizibeberutanabale.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9a03467e0---tilerowusupo.pdfIn PDF document text
    • https://dakotaterritorydevelopment.com/ckfinder/userfiles/files/zedexalugu.pdfIn PDF document text
    • https://watertorens.nl/userfiles/file/29002457616.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///kaxiberidividomifolaz.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091c0fdda434---7585515762.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/25822716433.pdfIn PDF document text
    • https://rivaflo-south.in/userfiles/files/rebitapuda.pdfIn PDF document text
    • http://pixel-pro.ru/upload/file/94930577745.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a733ae7f18---52493613378.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/dunatilegafoxakotaf.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/24268898b628583b1ac1fa3c9a51830b/wodagenibusorigupe.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/96858540972.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=phrasal+verb+with+offPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e980.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE980 17324 bytes
SHA-256: 778743caf047b9a81d77c8dfef7fd0172f19af1efaac22a40bf96142912236a2
font_01_sfnt_off000116e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012efc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EFC 10500 bytes
SHA-256: e88b24c0024c971deac234c59bcdeb3089ea58c512581bcbfee5b861844b3cb9

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