Malicious PDF — malware analysis report

Static analysis result for SHA-256 3803db37f72d835d…

MALICIOUS

PDF

149.2 KB Created: 2021-06-25 21:19:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: ec6cb2995d56520cc8b80d8c9afeb778 SHA-1: 6c4e1da6b393dfad977fc72a8eee31fb06a11a12 SHA-256: 3803db37f72d835d2cb202cb1218fb8dfb320b2623889284a146ea2e54a68052
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that point to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users. The presence of these URLs and the overall structure strongly suggest a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9756

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 https://synerhu.ru/uplcv?utm_term=forever+give+thanks+to+the+lord PDF link annotation
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160941eb235856---fowitibosibefewetiwesu.pdfIn PDF document text
    • http://onlinepravenconsultant.com/uploads/wysiwyg/files/vaxulip.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb137e0761---52725651165.pdfIn PDF document text
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607fcdba3e705---67427281142.pdfIn PDF document text
    • https://memoservicesrl.it/file/46736606764.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/s0c2guj9nq811sna40bqcs9oc1/subowigin.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b617812b68---74971182039.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1606f13510e956---ruvabalajeke.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/xaxararopelona.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/5070136400.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/dizapitatovaraxeb.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608107c444565---95870647738.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1607975e7d03d7---82479608970.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085843a10878---feminerofofokumilob.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/2f33kqi4dr4ahco1bpk7mmf1pb/52714539134.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072a8ee70816---66868062682.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/cc9b67d1777c272a596ff6185c2e9a75/dowotitalagono.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab6e9d4fe96---gurifolakunesobo.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/520af51a5abc2ff14471fc03d2bfefb2/35087963285.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/46b6da2b7a187e9db9c81ccd3024a43d/femebefofe.pdfIn PDF document text
    • https://beauti-full.ru/uploads/files/puxigupumuxafixowe.pdfIn PDF document text
    • http://bsp-oblspl.org/ckfinder/userfiles/files/18671268285.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609afb88a5964---8194349251.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/b3911f2db468cc15f5407ee596cd4e9d/pivugil.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001c741.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C741 19692 bytes
SHA-256: a3445d3236430f3ca1ade0ffa27a60f23b1a28eaf84b59a6bed00d8ab6865a76
font_01_sfnt_off0001f803.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F803 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0002101a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2101A 10660 bytes
SHA-256: a4e048f33ce87ae399aa9f108d630615ab88168d9108e76638f1b3cce2889d5b
font_03_sfnt_off0002283b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2283B 18556 bytes
SHA-256: c5a1475a67c0cbfada62153a792d8ef21c4a39dc00b7506e9f3e9fea3d4fa3e0

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