Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc31d46ca87e4cc1…

MALICIOUS

PDF

77.6 KB Created: 2021-09-01 19:22:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 93d66393b72971e8df52217a68bf4c09 SHA-1: 7ee7739d1c7993c8e13085a5a82405e901f62279 SHA-256: bc31d46ca87e4cc165f8c80c7e1d9630978a71d3997252fb5b4cecc8fa13e43b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://cructi.ru/uplcv?utm_term=troupe+meaning+in+english PDF link annotation
    • http://zulassung4you.de/bilder/file/kuvipogitimatexun.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/bemobi.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16073aa05e793e---pikutuzapod.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/file/bimoxudu.pdfIn PDF document text
    • http://djarkitek.com/temp/vinney/HTML/userfiles/file/78411000313.pdfIn PDF document text
    • http://eakqshop.com/ckfinder/images_store/files/jafikalururuxegulexibajo.pdfIn PDF document text
    • http://basaritarim.net/admin/editor_resim/file/sojaxude.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611e6c0769acc---wapawuxubugukisow.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1edf9043c2---89687679708.pdfIn PDF document text
    • https://mumegram.com/userfiles/file/13248206218.pdfIn PDF document text
    • http://nesemlak.com/test/images/uploads/files/jidulirep.pdfIn PDF document text
    • http://xn--80akazwaeiw.xn--p1ai/editorfiles/file/95664143633.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/d20d19b87523b38e8f744604a0e6d499/23184610920.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3fbe858c10---xigudewoguje.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/gu2bunbi8gopvpn1oncda86k9c/50769758063.pdfIn PDF document text
    • https://theshamrockpublecco.it/file/fidev.pdfIn PDF document text
    • http://studiomontironi.eu/userfiles/files/xilododax.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608bf63557723---73009728996.pdfIn PDF document text
    • https://linhquan-group.com/upload/ck/files/81548704169.pdfIn PDF document text
    • http://csc-0898.com/userfiles/file/20210612185231_y44upf.pdfIn PDF document text
    • http://nickelsgrafikdesign.de/ckfinder/userfiles/files/givodugisutonu.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ebd4f68205---80804927167.pdfIn PDF document text
    • http://mindatpeace.us/uploads/files/43350742963.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612381f27598d---3289527098.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_off0000c800.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC800 17720 bytes
SHA-256: d2980f25983f5ddb115646826373ec5ae5696efd1d6b74587f5e80c17eeb5de8
font_01_sfnt_off0000f5c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010de0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE0 10664 bytes
SHA-256: 77f6f9e9821664f313e6c12efb5e30f1fd20b6e05b4c296a1a6d11b06f9b9b5a

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