Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a4408c8fffb9ff3…

MALICIOUS

PDF

95.5 KB Created: 2021-08-03 14:26:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8b110df2ff04cedda993977868804f4c SHA-1: 0c86eadb2888a5108d9930b378905d91d85ecced SHA-256: 3a4408c8fffb9ff362daa48e00a1e478d9acde3d8033cf62c1d3b8baaa2dd0c1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites and other disposable hosting. These links likely lead to further malicious content or exploits, aiming to deceive the user into downloading additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://40parables.com/wp-content/plugins/super-forms/uploads/php/files/f54b302111f3629cbcbfac723fe45355/47618931580.pdf In PDF document text
    • http://jarauwerdaenzn.nl/userfiles/file/goforabi.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ddc1ea6d89---58889134984.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b863d412e79---jirevibapitikisotalak.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1608cf4acb8029---87439033841.pdfIn PDF document text
    • http://cn-noah.com/uploadfile/file/22054663898.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff12f9f4c5---68269599540.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/1b7e92984cd79caebc48096e70a6a14a/73050546572.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/4t3bhad82m45ec53sm3fm70ocn/losasewabodesisixenawogo.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607656c54b9b5---nawoxuf.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16072750964539---zedemevepokalidowemop.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/nc6gdhfrq0uhbtq40eg8bd1iq0/kalezilowupari.pdfIn PDF document text
    • http://vstarmp.cn/upload/files/20210710_142116.pdfIn PDF document text
    • http://woodsfamilypride.org/clients/2/2c/2c83419adcf4927d74d3defe18342386/File/87644416243.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/sfulh1rtq66aao15sic32iv52t/68477884175.pdfIn PDF document text
    • https://lasanisports.com/files/diwojajixox.pdfIn PDF document text
    • http://photou.cc//ckfinder/userfiles/files/62147559450.pdfIn PDF document text
    • http://jfe.hk/userfiles/43860420967.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/derat.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/e457e09cebadcb396a261709650a47ae/bagetiza.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/16107ea05bdf4c---14200559190.pdfIn PDF document text
    • http://madiran-cruduparadis.fr/ckfinder/userfiles/files/48724845385.pdfIn PDF document text
    • https://northcoteplaza.com/userfiles/file/77578831940.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=comedy+defensive+driving+texas+test+answersPDF 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_off00010ee2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EE2 11048 bytes
SHA-256: 9e0e04b29f84e8cca8e2cb1d09ae37f25ffd9c925c71cca5df8c64e5818503b8
font_01_sfnt_off00012885.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12885 17824 bytes
SHA-256: 1ea4a4924e42638ad3f4c7b96664dd6ea69c5d11928d8863665ccd7bb3d0201d
font_02_sfnt_off00015739.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15739 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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