Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3e355e76b2c8085…

MALICIOUS

PDF

86.7 KB Created: 2021-07-29 20:48:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7b32d17f57ab590f7c4cd6dd90e418e0 SHA-1: cd1e1690760f7a43506e3acb864c8e6e140ee31d SHA-256: d3e355e76b2c8085cfbb8acc6d28c9450b230c9ddb1c23b6810cbf613bff6b01
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document exhibits characteristics of a phishing or malware distribution lure, as indicated by multiple heuristics flagging it as a link farm pointing to compromised CMS uploads and disposable hosting. The embedded URLs likely serve as redirects to malicious sites. ClamAV detection further supports its malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://inwebjor.ru/uplcv?utm_term=how+to+pair+sky+remote+with+toshiba+tv PDF link annotation
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/b5163ce071182764da8feafc29d209f6/74741449017.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607580551a53c---25276959425.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/lh5l2cunpdlpi5aovujl4aup41/89933591373.pdfIn PDF document text
    • https://malayalamfoundation.org/admin/my_files/file/sopek.pdfIn PDF document text
    • https://vresponse.net/userfiles/file/limalejonokajiliw.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/gobazoromuvurezoge.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/daa5145b09c9761bef5283a66e8d09e7/padanegakome.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/83d22c74de49ccd2ecace1b3e58794e8/92374140520.pdfIn PDF document text
    • http://euroear.eu/ckfinder/userfiles/files/xikuxos.pdfIn PDF document text
    • http://associatedreclaimed.com/userfiles/files/43907353502.pdfIn PDF document text
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/88eb32ca6e5393e6149b650f0da2b2c4/60446015307.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a69917c745d---88570088792.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/35928593167.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083b6c05c884---zukawop.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d1bedccc6---37415843088.pdfIn PDF document text
    • https://rosenstein.lu/userfiles/files/95443512410.pdfIn PDF document text
    • http://erex.hu/upload/file/83292981376.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a30ab34bc79---51619659403.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/jsmrj1uf2rjidjke771bn6hav3/ratugelezasozixaweradon.pdfIn PDF document text
    • https://lanhcongnghiepthinhphat.com/upload/files/xebupadijowova.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f25196cf315---95357727261.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea5d6740d1---fameraluboru.pdfIn PDF document text
    • https://ipic.vn/userfiles/file/40856587393.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_off0000f01c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF01C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010833.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10833 10856 bytes
SHA-256: 8f3fa0b22b66078ea7d401d36f7a4f3eb7a1ac50d106747ce632f4d79461645a
font_02_sfnt_off0001212a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1212A 16544 bytes
SHA-256: 11549b16d7665855ccd5d98d84ac2cdc8f669faaf7a25036b8f07a1905dece02