Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f4f583974ff8507…

MALICIOUS

PDF

71.5 KB Created: 2021-09-02 07:29:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 64fb88c7898cf6081cb2d82725112883 SHA-1: e14a90c7ccd20fd7abf592b5d6cd99c17053217c SHA-256: 4f4f583974ff8507fc39a792b298cdefefe04823f88de01155cbc7104ee75e30
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised websites, indicating a link farm or phishing lure. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest malicious intent. ClamAV detection further confirms its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://veiligheidssloten.nl/ckfinder/userfiles/files/xijunepanarokivaxeronuful.pdf In PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ta3mf3m9v5mjhu3i6faraagr97/62285167341.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/1a0eca128187456298823c95fde245d6/64772843115.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/1efc95h2fq9hn9evlk5033pbql/10863208711.pdfIn PDF document text
    • https://mabuksusu.com/contents//files/ravuxoforasajegozamoviz.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1608f7670a6143---kigeluwidetibaretixup.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc9a03eca8c---61743731838.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/f765750ee6572b9fb512ccd542deecb6/lekapabejodujibiroman.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e92d1694b3---sawagegegala.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/r85o88og2jqsum116l4a3cg76b/papivamanovinirojutebinuj.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/f41c0bc75d990ce1988814832c5ce6d8/lapizufujezofu.pdfIn PDF document text
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/e52f982ed37829957cb11a0b1f64cc3d/72695905528.pdfIn PDF document text
    • https://guineaservicesproviders.com/gsp/files/8583087731.pdfIn PDF document text
    • http://www.pantonerestauri.com/ckfinder/userfiles/files/5661828478.pdfIn PDF document text
    • http://win-sonic.com/kida2018/ck_imgs/files/81085859518.pdfIn PDF document text
    • https://aquamedicasatumare.ro/ckfinder/userfiles/files/35032474477.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/85164459708.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/b4a080bea0f927e460d868573857f673/55918773803.pdfIn PDF document text
    • http://henskeschildersbedrijf.nl/upload/42444596523.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c05046cf965---vimanewuruzax.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/sepapitupogonuwa.pdfIn PDF document text
    • http://alexanderjamesbackcatalogue.com/userfiles/file/11804360109.pdfIn PDF document text
    • http://huefpdf.org/upload/file/zedobulojelenafomakobotep.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb5a3f1e89---44706536188.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=evidence+in+chief+questionsPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/1de547196a5a5079e15ac46249bd43fb/35662267768.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_off0000b912.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB912 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d124.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD124 15468 bytes
SHA-256: 7783cb95401dcf6ef75337b616d9dee8e6a62d405be2ffcede4cf8a1c9b82f75
font_02_sfnt_off0000f886.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF886 10560 bytes
SHA-256: bcde444c0620375292de03cc8bd7927c6a329af334b48b6c8c1693f3cd35ae69