Malicious PDF — malware analysis report

Static analysis result for SHA-256 320fc1af36114ef3…

MALICIOUS

PDF

90.2 KB Created: 2021-09-07 09:19:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 214ba17c65e5156c4fe22c82060a7335 SHA-1: 4dc87b3da4daf8ff23cfe5ee8be13a939b987e35 SHA-256: 320fc1af36114ef3468dbe57761c8e1fafd5cef3df4c9430db20b3de8ee7591f
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to potentially compromised or disposable hosting. The document body is unreadable, but the presence of numerous external links suggests an attempt to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 http://pilot-market.ru/new/files/file/fuwesutedavesimukidi.pdf In PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160866b6673987---simokanexebegeda.pdfIn PDF document text
    • http://songiadahoaian.com/upload/ck/files/demarufigilewabalo.pdfIn PDF document text
    • https://raiporjai.com/piceditor/file/pelamulogewuvu.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/16072cdfd51ff1---fowerofamagaselixuku.pdfIn PDF document text
    • https://irepairplus.nl/app/webroot/files/userfiles/files/70639019965.pdfIn PDF document text
    • https://himalmanpower.com/ckfinder/userfiles/files/39895433888.pdfIn PDF document text
    • http://quangcaosms.org/media/ftp/file/72281477177.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/g4ruini1f95tfupuhv5jbmm9j4/fitopafejovuleno.pdfIn PDF document text
    • https://bangvetthuong.com/luutru/files/zivelo.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/b9a6ae34674390bf6f27f6e2a95f22b7/74009262535.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/e5712579c41c2ea7ddc411430efc519d/rifoxukudazasebikabumekur.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/02nb0m79veeeeiff0vlhl3h845/63491439650.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/252b6ab9eef5e1c0dc02e72ca7d6e2c2/56616203205.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d2187afce---78990653865.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085df1cc591e---72398793774.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b8d48f0a0fc---46515469925.pdfIn PDF document text
    • http://debsluxe.com/clients/1/17/174397649ed9f07baa8f9d9f48c72a4d/File/reziluxam.pdfIn PDF document text
    • http://happyhanool.com/ckupload/files/juminivogisifat.pdfIn PDF document text
    • http://thebellingerfamily.com/clients/0/05/05034faaa501c69409a7459485cba135/File/21721069849.pdfIn PDF document text
    • http://csc0731.com/userfiles/file/20210819161001_zgckwz.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/acf96bb77b3f8bf3b9f8444bbeba9e61/xavubipegek.pdfIn PDF document text
    • http://debsecond.net/UserFiles/File/95070069847.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=manual+of+seamanship+1932PDF 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_off0000fa3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA3C 11028 bytes
SHA-256: 3e0658a6ac9e1cab91502f5f23b74bc0c8ab3c47d368102e53f54f6d0542c5dc
font_01_sfnt_off000113c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012bd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BD5 18172 bytes
SHA-256: f2aa419c5076d68e2243ae2fd3bbc74ec0d91f7cb3895586cc4cc5e8818c6c4f

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