Malicious PDF — malware analysis report

Static analysis result for SHA-256 dde604d004c71325…

MALICIOUS

PDF

89.1 KB Created: 2021-09-08 00:57:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 19416d6c690e712684119eff74cbd40e SHA-1: 9f1857a2d7e0face6e748ccc8f5d8e91590f429a SHA-256: dde604d004c71325684feb64997995f8275e206861798da888b912e6a664ec0e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external PDF files hosted on compromised websites, suggesting a link farm designed to distribute malware. The 'SE_INVOICE_LURE' heuristic indicates the document's content is likely intended to deceive users into downloading malicious files by posing as an invoice or payment request.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://zavalinka.by/var/upload/file/63527864596.pdf In PDF document text
    • https://pbchistoryonline.org/uploads/file/95606324134.pdfIn PDF document text
    • http://thanhtindesign.vn/uploads/image/files/3087598027.pdfIn PDF document text
    • https://btsmstlucia.com/atomicsteps/upload/userfiles/file/54243400723.pdfIn PDF document text
    • http://0vote.com/ckfinder/files/78837433757.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/ks26817ulugo9pi11smvkaaqh4/toriwururorekiji.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/8kiu4c8p62lglgt8hqnr3dpdh3/78110122456.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc49c1c83b---tekokajiwejiwesogobapof.pdfIn PDF document text
    • http://gospel-pour-100-voix.com/fichiers/newsletter/file/26516848890.pdfIn PDF document text
    • http://netflor.pl/upload/File/65120697098.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/f6443d82cc28f3ea0abc76f011dd69bb/23773359732.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/a106eh9r4feek9ncmjr3fkt0b0/50003338939.pdfIn PDF document text
    • http://tksvolga.ru/userfiles/file/wozawifidekopisigatodin.pdfIn PDF document text
    • http://abarappresentanze.it/userfiles/files/91076950159.pdfIn PDF document text
    • http://acril.ru/ufiles/files/35823783070.pdfIn PDF document text
    • http://zoekidsworld.com/userfiles/file/26942785153.pdfIn PDF document text
    • http://orhs76reunion.com/clients/30721/File/90207832659.pdfIn PDF document text
    • http://talk200.com/admin/admin/uploadfiles/file/79280151122.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160f3232f9b472---vuzatodaz.pdfIn PDF document text
    • http://ajisushionline.com/uploads/files/belonu.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/18594859279.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611151650a438---jeranudepimof.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/81744349570.pdfIn PDF document text
    • http://sure2trips.com/bot/ckfinder/uf/files/fifosikatotazisima.pdfIn PDF document text
    • https://senarathgroup.lk/assets/media/file/didojarojatezuwur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=utah+dmv+bill+of+sale+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000dd73.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xDD73 18056 bytes
SHA-256: 6b4c631b6b4e33163478646c23c2ca55edf17f9adf6ce9029f4d40fc9ed08e6c
font_01_sfnt_off0000f92f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF92F 17248 bytes
SHA-256: 70e9f10a6b1f746f81cc0e669b3b23b2b99452b38c8ad7fba777c75d623e7a47
font_02_sfnt_off0001256f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1256F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013d86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D86 10772 bytes
SHA-256: 1336eb729d213a9ed596d4abea391add27f537a98c0c2aba39b71c1875d996ba

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