Malicious PDF — malware analysis report

Static analysis result for SHA-256 07eca3f85a158ad9…

MALICIOUS

PDF

81.0 KB Created: 2021-09-02 17:34:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1f4fec89a8b8a3705d94463930ec0e32 SHA-1: ed23778824eba76aae1deed893390174c9df59cf SHA-256: 07eca3f85a158ad9fe875c9f1b046930948b5d6b4286ebe488b0f4cdf8163e65
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. The file contains numerous external URIs and link farm patterns, suggesting it is designed to redirect users to potentially malicious websites. The presence of compromised CMS upload links further indicates a pattern of hosting malicious content on seemingly legitimate but compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://ketchas.ru/uplcv?utm_term=solutions+upper+intermediate+student%27s+book+2nd+edition+answers+pdf PDF link annotation
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/u2lfcb1jr3082d0ukvi8j0nlo5/22577469850.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/5b1pg607f6qkp9tdl7032c6jau/sifugofibim.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-5-17/20210517013552895985.pdfIn PDF document text
    • https://deltagroup.bg/uploads/file/53235022155.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/dobajosix.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///duzegaparugosezewujowadev.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd58c79d6f---gilivolinisut.pdfIn PDF document text
    • http://buyo-g.net/userfiles/file/sofurirow.pdfIn PDF document text
    • http://fijiembajak.com/uploads/ck_uploads/files/gikadumigozikegivubus.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/cabefe36840a6e40a566944923179729/kimaxukadadakibadisiwutow.pdfIn PDF document text
    • https://detector-billetes.com/Imagenes/file/vagodigujogesane.pdfIn PDF document text
    • http://montazerangroup.com/uploader/file/10936256238.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/dl558gnotug8rbdm87c3aihki7/1891336836.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610046c6c6bd0---36443555720.pdfIn PDF document text
    • http://lblussana.it/images/file/feraja.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/f304d1f2470d1fdd6df9c50e85c74950/fovetalemut.pdfIn PDF document text
    • https://ph2020.org/ckfinder/userfiles/files/15899401919.pdfIn PDF document text
    • http://eltdb.com/UserFiles/files/pumojev.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/1d11f2021dd974f14199ee8482c71dd6/99271168778.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/16084846464c9a---wijiwineronuzosifa.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-26/20210526160932323819.pdfIn PDF document text
    • http://tmtechvn.com/webroot/img/files/subaxevi.pdfIn PDF document text
    • http://bezagsecurity.cz/userfiles/tedebosavamepuno.pdfIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/04d458c1adc55caf8e556862297a350c/26681649130.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_off0000d503.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD503 11308 bytes
SHA-256: 075c16423f89fa9a1b31fa9a4b86e4947638cb4fb1e57551e7c0e28590a7095c
font_01_sfnt_off0000ef7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF7D 17868 bytes
SHA-256: 00a070f5ad95d65607597b086b39980ca92d59ae5b91a1b9ae3bf3ca0a0c7258
font_02_sfnt_off00011d42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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