Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f35b7808c4247e0…

MALICIOUS

PDF

77.7 KB Created: 2021-09-06 19:47:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6f428569733d82826a8af81c8d4c4d06 SHA-1: 59f4454a0e7ae1f4152ba5c29aee2b39d07637c9 SHA-256: 3f35b7808c4247e0eed120a258bdf6b51b248f82687a23a6fccd246365431bb6
156 Risk Score

Malware Insights

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

This PDF file was identified 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 and other disposable hosting. These links are likely used to redirect users to phishing pages or download further malicious content, aligning with the typical behavior of a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crewmak.ru/uplcv?utm_term=b737+fctm+pdf PDF link annotation
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/9312q4ei3jucsm9ap58v4u9fnu/jururupixawi.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160875508cfba1---27647137853.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607578e665b0e---josureloj.pdfIn PDF document text
    • https://sensiblemachines.com/ckfinder/core/connector/php/files/dunijelum.pdfIn PDF document text
    • https://amadesafar.ir/basefile/amadesafarir/files/digakunipawisagisaz.pdfIn PDF document text
    • https://cheeselicious.net/UserFiles/file/68664645073.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/74fed63eef0b18a2e4d132808ba26ac4/24448288482.pdfIn PDF document text
    • http://tuhocxuatnhapkhau.com/uploads/ckfinder/files/besilesipum.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16085d737e5dcf---18870541594.pdfIn PDF document text
    • http://insidethedigitaltrend.com/userfiles/file/xofikuwigepixugez.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d2187afce---78990653865.pdfIn PDF document text
    • https://vvpta-irvine.org/userfiles/file/95326129327.pdfIn PDF document text
    • http://gd-weimi.com/upfolder/e/files/20210805235258.pdfIn PDF document text
    • http://rafaelokazakov.com/file/50109040216.pdfIn PDF document text
    • http://raegcafe.com/uploads/files/pekide.pdfIn PDF document text
    • http://twozonechickenlasvegas.com/uploads/files/68987921088.pdfIn PDF document text
    • http://rilta.net/userfiles/files/fiwuxogukowit.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f5751ee20---48585747864.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1d2b49a63---82741621213.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/2n35f6ul0i65tucolmakrcgenn/14479047442.pdfIn PDF document text
    • http://peoplefoster.com/pliki/rififup.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/3ee047f36d65f37e6d6403d8d5f76a63/pogosakubamej.pdfIn PDF document text
    • http://jkohut.pl/file/kajubejejafusulujowup.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_off0000c97a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC97A 10132 bytes
SHA-256: e41dbd0345a1ac1b3af27b092a2138ba74aaf28e0c48fea0910e181e039192c7
font_01_sfnt_off0000e034.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE034 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f846.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF846 18792 bytes
SHA-256: 946843e7e6d351ee502f3ecab7837a9668058c53b64f6c9d4580cdacf1374e1b

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