Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f01cc73e49f65d4…

MALICIOUS

PDF

95.4 KB Created: 2021-07-01 14:17:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 43540d4734999cf9b1bb58fde34217b0 SHA-1: 63371b223e095968758317b50e31f0fb9a276860 SHA-256: 4f01cc73e49f65d453be339e83db503d97219297180b4e86a5a24cb0e6291daa
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm, with many URLs pointing to compromised WordPress sites. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. The file's purpose appears to be directing users to potentially malicious content hosted on these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/2a6d3ceb2bebc35fa5c2ad54dcad2100/92682354019.pdf In PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/3fac7591f0d85e0eb04ae08f4f8eb507/31765269350.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c677584856b---81746480835.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/91ouic45q01lu8neunnhbb1r15/nowelunajimasibezixat.pdfIn PDF document text
    • https://ktmcollege.org/public_html/userfiles/file/91514899962.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/25a79e9ac1abea515b402e27b88f6a9b/12589727310.pdfIn PDF document text
    • https://dukra.sk/editor_uploads/files/80464106855.pdfIn PDF document text
    • http://peak-experience-japan.com/xiluguzudagojonilola.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-5-30/20210530101923711653.pdfIn PDF document text
    • https://buka.ru/sadm_files/vijebogakelugodujipig.pdfIn PDF document text
    • http://luingpyrex.cz/foto/Image/file/69244998525.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/2b458c899b371f132a6079d560b41f90/gokapovixikiwagatitew.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160c1956423bde---nujaluwu.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160722370dfdd8---7609571265.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082ec800e001---vagup.pdfIn PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/sijoledanebun.pdfIn PDF document text
    • http://camionespanamericana.com/userfiles/file/48564976104.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160d6e301ce6ac---41377520169.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c0b1156808d---87941403953.pdfIn PDF document text
    • https://hinodanang.com/uploads/image/files/56970662193.pdfIn PDF document text
    • https://slide-bearing.com/d/files/3808100863.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5a4d2c2d80---17393961732.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c1d42546b41---45824431752.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/8stpt5aa8egiml7oo9nqpfm0t4/23716755831.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2add8a9c6c---87897371057.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=hiking+dead+horse+point+state+parkPDF 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_off00010f07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001271e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1271E 10708 bytes
SHA-256: 865ef1b6ece0043443e20b6337114efedc6dff1f2cf9f95e96fae1d1eb61a5df
font_02_sfnt_off00013f5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F5E 18728 bytes
SHA-256: a1081377d40419f3d346dbb78c8951701bfb8d079770047e6a63a99bbc266f33