Malicious PDF — malware analysis report

Static analysis result for SHA-256 a61529fa6c397726…

MALICIOUS

PDF

83.7 KB Created: 2021-07-07 02:21:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 8a7958da4a9c53d695c2a97f141f5baa SHA-1: eb0f0ed1ecc5b736fff555a1b905415ccd17ed4a SHA-256: a61529fa6c397726d3c77c4521993fb4bbf3116dc77a34d21a301b7d4174a322
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file exhibits characteristics of a phishing campaign, leveraging a link farm hosted on compromised WordPress sites to redirect users. The primary lure appears to be a fake download for Rufus, a legitimate Windows utility, directing users to malicious URLs. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a secondary payload or lead to credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://medvor.ru/uplcv?utm_term=rufus+download+windows+iso PDF link annotation
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fa15f584d1---60185707018.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077b91ea9d38---18286845949.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/jonamamusikipukisitusomo.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c177aca422b---4701428984.pdfIn PDF document text
    • http://mabifitness.it/userfiles/files/solazebokalelavidi.pdfIn PDF document text
    • http://centreforeffectivecoaching.com/media/file/9709665729.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4cca3e7603---35011306606.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2d6c4fbe7---naxiditipawojaxaju.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbb027e0701---81159666710.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/45259447728.pdfIn PDF document text
    • http://dlevitin.ru/fck_editor_files/files/61773351202.pdfIn PDF document text
    • http://colescastle.com/clients/875019/File/vutijopewagiworaretek.pdfIn PDF document text
    • http://appletechsolutions.com/userfiles/file/10746784403.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f756643108---9652096894.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/6cho0ftfartjubud5mmaj2025c/gurukisinobubapowupufoxi.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/107913164b14c399891327b71eaaa921/livugok.pdfIn PDF document text
    • https://an-professional.ru/img/files/file/lepijabefepa.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/ad3639cd64e04fc96a5af9c5dd0abfb1/jinawixosotegapijar.pdfIn PDF document text
    • https://kopari.hu/files/file/wogoxi.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160c14cac53039---kaniligupowezobosekajir.pdfIn PDF document text
    • http://alexanderjamesbackcatalogue.com/userfiles/file/godakutojevewe.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/qu49tt1t50b3ukr11ot9lcjrf0/81474708137.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_off0000e84b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE84B 10248 bytes
SHA-256: 61aca7ef4fd4ba45f9115414b9a13f4cae82f5e788ca70272a68bbc32aea7219
font_01_sfnt_off0000ff75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011787.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11787 16388 bytes
SHA-256: 49744bd505f71ded218c8ef373821b1af43e7b3cb2307a37dc7ea83f0bd76ab3

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