Malicious PDF — malware analysis report

Static analysis result for SHA-256 3adff091f23e50eb…

MALICIOUS

PDF

78.1 KB Created: 2021-09-05 19:05:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 7e48eb5598d9ceeb1b50a4db3e8149b6 SHA-1: 05274c7a9f24c1133c8e300e171c638e31828bd8 SHA-256: 3adff091f23e50eb288f30845b04b1b4280d729be895c5cd0088bbf222bf8270
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://archism.ru/uplcv?utm_term=conversion+de+unidades+de+temperatura+pdf PDF link annotation
    • https://domilot.com/uploader/files/43583013771.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/wagixixofudojuzabuf.pdfIn PDF document text
    • http://walkofagesvt.org/clients/0/0e/0e42319052772b195a43ba3ede0f03e0/File/55532331573.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/lefimuzalagupo.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/7n65qkb68ckaretjmhc0i41hp6/9215455263.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16085e57b5173d---73663289468.pdfIn PDF document text
    • https://defaico.com/d/files/lunedinupexiwegemugepo.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/a79076a592d4b5d1c8138821b31ef6fa/75956489948.pdfIn PDF document text
    • https://franchiseharbor.com/files/files/41832361830.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/labanikixaduliretibe.pdfIn PDF document text
    • http://eluvial.com/sites/all/sites/eluvial.com/files/notiwapinesax.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/jabevusaradadefenetevafus.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/wigowogazilomiwipo.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608c0a352152c---8962427579.pdfIn PDF document text
    • https://cityface.cz/res/file/91726349350.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091319c0bff1---tavarujojafonev.pdfIn PDF document text
    • https://www.reflectionuk.com/wp-content/plugins/super-forms/uploads/php/files/tdd3rg31kce12jift17m5gn7fl/wozabinejozerujewed.pdfIn PDF document text
    • http://madonnina.info/userfiles/files/46857177968.pdfIn PDF document text
    • http://xn--80aafjbaeihgganggf9ajkncugh2a.xn--p1ai/pict/file/mezenegov.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/c5c29baba3af46a90a691c8ab8dd7b19/zigewuvaf.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021060902033880.pdfIn PDF document text
    • http://mgocsm.in/userfiles/file/navowodojukulazumowosu.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/64186621513.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/72545814578.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608b9ee00ad6f---rosatikomulekijudizaposip.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_off0000cab0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAB0 18460 bytes
SHA-256: 7e1ecd1c721b63fbd60b77e7ab657ae60d791c219a9d4122f6fe2dc884316b99
font_01_sfnt_off0000f90d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF90D 10808 bytes
SHA-256: fe29963139af4c343b5383c589036da4a588ac9bed7ae7e9a9a8b630ab04fd49
font_02_sfnt_off00011210.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11210 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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