Malicious PDF — malware analysis report

Static analysis result for SHA-256 83d3c8e983bad0dd…

MALICIOUS

PDF

100.5 KB Created: 2021-07-30 20:27:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: f3bba68144ca5cc9882fadb36f120065 SHA-1: 761f19072b96553d83376c868262b4dc6d7d37ae SHA-256: 83d3c8e983bad0dda634126bdf6e801b5698742d41ebd9ddcfde42e55d098e9e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. Several heuristics point to the PDF being a link farm hosted on compromised or disposable domains, designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics suggest this PDF is part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://kondicionery-vidnoe.ru/upload_picture/file/32123314274.pdf In PDF document text
    • http://upperdublin1970.com/clients/3/3b/3b2fb281f4756d03d37a29c41a8c1d95/File/37539112038.pdfIn PDF document text
    • https://latework.cz/soubory/kewukunodagunix.pdfIn PDF document text
    • http://coyada.com/up_images/up_images/negelolawi.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608fb55a58853---repavizage.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1606f188e5d8ee---lakuni.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7abc5d104c---meriti.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a04cf285514---4573737162.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/81191439390.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082649cbb55e---loludonapatetoxakubolaw.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/remiwusomep.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/nodamepi.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b07a24e4912---nawesavitexe.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/ace7639002344964dfba875471763db7/96611567369.pdfIn PDF document text
    • http://pvvc.cz/files/22292979475.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d781c94cc39---mulorirepajipuzeje.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5bcbacdece4d6f4065dd1e2c2539b851/64606421037.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/zafowudewunejiwivewosaxot.pdfIn PDF document text
    • http://cyklo-sport-servis.cz/UserFiles/File/62373638865.pdfIn PDF document text
    • https://seger.cz/userfiles/file/90474025394.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607a186027742---bojirug.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/bqnrnm862ctlciku2210nk2q22/seruludawo.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/5eb0d4424d544d1d12c91601ceb4d8f5/tisasewunenawop.pdfIn PDF document text
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/14504531090.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=who+rules+the+world+noam+chomsky+pdfPDF 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_off0001209d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1209D 11176 bytes
SHA-256: 3de29d88b9dba7efe86e43f2bb563442b1d43cdf5f71328593373ed30a710946
font_01_sfnt_off00013abc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ABC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000152ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152CE 18264 bytes
SHA-256: df2f6b140db706f26f1306988c0355bfc7d41904db3873ff41428fd89fbf2e55

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