Malicious PDF — malware analysis report

Static analysis result for SHA-256 c42394547ce0c889…

MALICIOUS

PDF

89.1 KB Created: 2021-08-22 03:48:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 60edc49526ac9988a97adb4fab05b750 SHA-1: 7335cfb337f54468b0d513d5f6abdaf9d5d185e5 SHA-256: c42394547ce0c889e6999e5d51ab46b4d04bf6b9548de9242087de9961c3c149
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The ML classifier and ClamAV heuristics strongly indicate this PDF is malicious, likely a phishing or trojan delivery mechanism. The document contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm or SEO poisoning attack. While no scripts were extracted, the PDF structure and link farm behavior are indicative of an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://www.dooleysnaturalgas.com/ckfinder/userfiles/files/gomodiniwojo.pdf In PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/f9be149a71d12d148b49781517b9bcee/32173589525.pdfIn PDF document text
    • https://mimpishio1.com/contents//files/muzibaseje.pdfIn PDF document text
    • https://hanakspotrebice.cz/eshop/ckfinder/userfiles/files/9120174756.pdfIn PDF document text
    • http://salonorganica.ru/upload/files/tajosavobusevorerew.pdfIn PDF document text
    • http://daedukgs.com/admin/fckeditor/data/file/20210604061725.pdfIn PDF document text
    • http://www.shadowrangers.live/img/files/penukomirokogatumerabu.pdfIn PDF document text
    • http://agriturismolescuderie.eu/userfiles/files/13025647704.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf74c556d6f---malon.pdfIn PDF document text
    • http://prosquash.by/data/muzadokazajomavu.pdfIn PDF document text
    • https://efnnma.org/files/file/35333722715.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608e62a3a2455---21787086407.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/wirup.pdfIn PDF document text
    • http://kabaretyimpresariat.pl/Upload/file/77409790973.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/muxedibowuxojerovud.pdfIn PDF document text
    • http://jarosi.hu/files/file/60175449640.pdfIn PDF document text
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083a9c4f1202---dajeriluliruxafuno.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d9fa31252a---jafikipogadakawifi.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160859f953abc9---47272798924.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/55821626693.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/tebuzuvigibudedazu.pdfIn PDF document text
    • https://pass-eco-energies.com/ckfinder/userfiles/files/nabavuxizukurukalafozara.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=what+is+a+casual+employment+contractPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3BB 16884 bytes
SHA-256: 354fe92f1e305a40cc2c30098d3817f840086481a44b92e14cffcb3f4d1d82e3
font_01_sfnt_off00010f5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012772.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12772 10848 bytes
SHA-256: 8eca389e632bbe604816d42e813757928a309fcd1e40520bdc83f5854ef9406a
font_03_sfnt_off00014057.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14057 16144 bytes
SHA-256: fcca37035df06e555c2991ff65faa0e8497ca6423bee408ebc46b3aef925b516

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