Malicious PDF — malware analysis report

Static analysis result for SHA-256 a366d84a63dbad57…

MALICIOUS

PDF

130.3 KB Created: 2021-08-19 01:14:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b6df2954212e84ebad1db590614a6ccc SHA-1: 626f711ba48c21865072b2b2aa37e46e32d813b2 SHA-256: a366d84a63dbad5735dc140eea1ee3b2ac8d658564a66db0ce8d884f1f9e2d6a
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or delivering malicious content. Heuristics indicate the PDF acts as a link farm pointing to compromised WordPress sites, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/377f33afdgmc1tjr63tpke4da5/3625650965.pdf In PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/ac10c111746348fa631b99ed10b6e930/fewowolatetopiditiduluz.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/em6si24qnbpdpj9o49mhc2rbk1/nanuwemixidowamav.pdfIn PDF document text
    • http://concurs-euclid.ro/upload/fck/23916683344.pdfIn PDF document text
    • http://stpatricksreunion.com/clients/84553/File/16798514381.pdfIn PDF document text
    • https://paymentor.nl/uploads//file/puzuvizuzepubiwir.pdfIn PDF document text
    • http://hyundaiokla.com/uploads/files/tabepufiletafipubufovu.pdfIn PDF document text
    • https://people11people.gr/uploads/File/lufonare.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e2d6afd63---73013628294.pdfIn PDF document text
    • https://burgas-remonti.com/userfiles/file/zabosixoname.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083d8b2c4dc5---14932936539.pdfIn PDF document text
    • https://successstudio.net/userfiles/file/demaziwa.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/qihppn40ebvodqedie0tpo0ktl/rijobominejolerumakupov.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160f01f968ee1b---60584718585.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/d07f189f0cc08fb790c9aa2e0123d8dc/39704166140.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f1d25893f1---roweroxidexinamujejija.pdfIn PDF document text
    • http://albarossa.jp/js/upload/files/83337090880.pdfIn PDF document text
    • https://gbagencement.fr/uploads/file/49850249966.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160928fb3bef0b---55452912768.pdfIn PDF document text
    • https://erdemlerkoleji.com/resimler/files/99579583925.pdfIn PDF document text
    • http://instant-image.net/UserFiles/Site/File/17236739086.pdfIn PDF document text
    • http://valsadindustries.com/userfiles/file/68734953525.pdfIn PDF document text
    • http://www.trotasierra.com/plugins/ckfinder/userfiles/files/lomakedi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=harry+potter+and+the+half+blood+prince+chapter+24+summaryPDF 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_off00018f51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18F51 22184 bytes
SHA-256: 34b03059f161ded9ee45e8f2744a4da9c046fe9106ee81a7b106f83e1437b590
font_01_sfnt_off0001c627.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C627 11428 bytes
SHA-256: 8387a6d7616156574c68847aa6c1f16fb656817650c5e28a9f0708107ab8d2bd
font_02_sfnt_off0001e0c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E0C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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