Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bac534dabc5130f…

MALICIOUS

PDF

81.6 KB Created: 2021-08-04 22:46:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6e6a447027c55a1d172d192d0afc8ff8 SHA-1: 96245dfb889eba28f8499771f21025a64d5da969 SHA-256: 6bac534dabc5130f4133ebecc93070a9002de9b774097f0e470b4b61845539ff
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, suggesting a link farm or phishing lure. The primary attack pattern involves directing users to external malicious sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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+make+a+fake+pregnancy+bump PDF link annotation
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/017065c7d844e876b424f3394a423db4/bawesoxisuwo.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/fc0736ebgogs69c00g05jo56sg/81165746654.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/e2bbba3e50fbeb2891d2983846fb8dd4/sugupotifemup.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/33324096486.pdfIn PDF document text
    • https://profesa.net/userFilesfile/vikizimi.pdfIn PDF document text
    • http://ngor2-3.com/file_media/file_image/file/roridutafirafumitidape.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/numopumusasuxagafare.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160bcb8a9ccdb4---xugedijador.pdfIn PDF document text
    • http://harasim.cz/uploaded/files/fupez.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///98258048099.pdfIn PDF document text
    • https://takeorders.online/wp-content/plugins/super-forms/uploads/php/files/7h97mrdaem5fi0lhc2i7s8uef4/vusivutoguvuw.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160815d78ae15a---99364313025.pdfIn PDF document text
    • http://christschoolblr.in/userfiles/file/nokasazemezuguxem.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16100c41583779---gebumikamoru.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f8e920bf8---gibibefi.pdfIn PDF document text
    • http://tecnibat.net/uploads/archivos/mapedolafuxonupuz.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/fc7353671c715383b62c22c017d56bb2/linuwupid.pdfIn PDF document text
    • http://kimhoatra.vn/upload/fckimagesfile/rezilawomamaluwowodasu.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/7dad4f0f30209ee1ab1a0bca3acf45b4/34116078594.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/3ff53e4b4bbb7f9a551701d7667e8a33/tatajuleven.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/aigps24n8aljf3oi7575t0mcrj/kemaresafopolipudutunax.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/d189f53a2aae6cee0277b14537230431/dutaronolosewujozazarelup.pdfIn PDF document text
    • http://brno-skoleni.cz/ckfinder/userfiles/files/sezosefusibodev.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///16500342725.pdfIn PDF document text
    • http://hong-tour.com/FileData/ckfinder/files/20210803_5FB9202E9D38541D.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/m0en8kunqed43ldbu96lg1std8/jolomizanulaxagibun.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7b15eba1d---57345251746.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_off0000dbde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBDE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F0 16392 bytes
SHA-256: ec93774f67aab83f55d06c95b02a4eeb0f56e5272821a4a3f0ad78988795559e
font_02_sfnt_off00011e69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E69 11040 bytes
SHA-256: 56535bff1736ca7571bb7319a9ba075fcf7fd7cb7c9de4c307e6e80418e51af8