Malicious PDF — malware analysis report

Static analysis result for SHA-256 760f779ef39bc714…

MALICIOUS

PDF

131.4 KB Created: 2021-09-01 13:53:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f69ec0cdd40949d568933257e2bcd114 SHA-1: 73b87d677b25573832a07f855c3a7495f91004ce SHA-256: 760f779ef39bc71460feb9b80d99f5163175103fed46b808136c163600265178
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. ClamAV detection and ML classification confirm its malicious nature, likely as a phishing or malware distribution vector. No scripts were extracted, but the structure and URL targets indicate a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9873

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://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16071ed791a994---sixuzarifudamile.pdf In PDF document text
    • http://m-s-g.ru/userfiles/files/sijukitupuwukobuzeselazi.pdfIn PDF document text
    • http://nextgenship.net/upload/file/20210519162141569625.pdfIn PDF document text
    • https://knurussian.kr/DATA/upload/files/202108121947387609.pdfIn PDF document text
    • https://etimes.mn/uploads/files/dovobuwobifugaf.pdfIn PDF document text
    • https://hkfew.org.hk/ckfinder/userfiles/files/bujatez.pdfIn PDF document text
    • http://suachuaspa.com/upload/images-content/files/30075036179.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160949efd60e28---51828912345.pdfIn PDF document text
    • https://kingyao.com/uploadfiles/files/20210716_154607_2211.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/3pk9ietqu22u9gdh2cfi618g6n/53274324545.pdfIn PDF document text
    • http://gsmontaggi.it/userfiles/files/94715003792.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16081474f56994---lukebemofibilekebowi.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/69107139286.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/03edc436bd8c6aa87b6079623fcbbacf/31385196955.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/cdgrn2jlbhma7qpjsf316c8g66/46187105992.pdfIn PDF document text
    • http://studiomalpocher.it/userfiles/files/fisedikunowugiverukal.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/32518976406.pdfIn PDF document text
    • http://yamamatoen-wanwan.jp/ckfinder/userfiles/files/14557841587.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/3e4a9b5a277c7c5562ff83551c82be4c/11426572258.pdfIn PDF document text
    • http://npi-management.org/ressource/site-image/files/gijesivezogidikoteba.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076872d447b5---kedifiraxudoxavejupowajox.pdfIn PDF document text
    • http://www.mousumibanerjee.com/fckimages/file/19299034957.pdfIn PDF document text
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/vugatoromob.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/a792fbf9b83947797203dd8e655860fe/62900317064.pdfIn PDF document text
    • http://phanphoiongnhuahoasen.vn/upload/files/20112539168.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16080f4bad1acb---makalezilimoludagib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=community+engagement+picturesPDF 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_off0001a05f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A05F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001b876.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B876 10916 bytes
SHA-256: cc2edea8a036ea892b6ab83e2c070c5ae0a908e0c8613fd32553d9166d93a612
font_02_sfnt_off0001d1c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D1C8 17272 bytes
SHA-256: 4622d5a0b5c9623b611f9a45b67a48fe2e43acdf95b4f8ca548959f4b900890f

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