Malicious PDF — malware analysis report

Static analysis result for SHA-256 68348472e8f09ac0…

MALICIOUS

PDF

85.2 KB Created: 2021-09-02 22:42:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 085b3bbdf504ff0cf2e5a1919d405baa SHA-1: e26f5501ddff5aef65094c9500f65aeb10f7dd16 SHA-256: 68348472e8f09ac054bd099d8413a5228cb3af26dad09888da4be850d0e00d51
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a large number of links, many pointing to PDFs hosted on compromised CMS upload directories, suggesting a link farm designed for SEO poisoning or to lure users to malicious content. The presence of multiple distinct hosts and the use of UTM parameters in some URLs further support this.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://protok.pro/upload/files/79836839678.pdf In PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16090bcc685208---13805977165.pdfIn PDF document text
    • http://bienbao.net/uploads/files/lefexeb.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b00280a59d4---bixiropikidagun.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/kawokikojekikawagotij.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/01d32d2a6a3ca2f5025e012fbd30d6b2/28727338286.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d740449e2---xidukojulabevezixosowadi.pdfIn PDF document text
    • http://prplus4u.com/ckupload/files/fijuzatimigagunujuzuso.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/dc07e3405190c3659c03ea1fbd8e13ee/50634529591.pdfIn PDF document text
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/1d31c12ac9b8047cbada10c0d8d6d8d4/jovoborew.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a5503c1f812---62886037445.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/2djaos5q6anngma62iscsmqv9m/tatoxijogodurijexipex.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/16085076526806---9190248581.pdfIn PDF document text
    • http://td-mg.ru/uploads/files/pimitunobuvasig.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b0fdef8d8af---mefipefuwederu.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/c506369ba705dc336df8bad2e2cce123/xixasasorinuwagugidezewaj.pdfIn PDF document text
    • http://zh-huaxun.com/uploadfiles/files/pizegizoxululupibokufu.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/cd55da4dbe1e875d3fb03eb6771743c1/pizepiretabajusukegefadel.pdfIn PDF document text
    • http://royalwedding.jp/images/blog//file/sapojomutes.pdfIn PDF document text
    • https://instalacje-elektryczne.net/ckfinder/userfiles/files/banuwotiretusuxuxejaba.pdfIn PDF document text
    • https://delta-relay.be/userfiles/file/femoxad.pdfIn PDF document text
    • http://domario.ru/userfiles/file/xavozifobawuwosoxos.pdfIn PDF document text
    • http://eternoohydro.com/d/files/ragivegak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=kriteria+miskin+menurut+bps+2017+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e92c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE92C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010143.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10143 11160 bytes
SHA-256: f645aff65973dfacd21bc625042d6be62fa4b7b46972d9cd6f7fcede2d380fb4
font_02_sfnt_off00011b3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B3A 17100 bytes
SHA-256: d208fdf21c89ae7a39c61ed5ee8a063e8a9d5e803bfa3550bafbec0e58b1abcc

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