Malicious PDF — malware analysis report

Static analysis result for SHA-256 a58ca6f7974f49c0…

MALICIOUS

PDF

75.9 KB Created: 2021-05-10 05:20:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0e01afd811bc1d492a0d18c2a362ff82 SHA-1: 384ee6cc6e7fff9cb583da3fa6fd2539d26bcbd8 SHA-256: a58ca6f7974f49c03ce04ee8d58e0f1c6e26e1a1c2d0f316d390c64fa26456fd
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The heuristic 'ML_NYX_PDF_MALICIOUS' and ClamAV detection further confirm its malicious nature. The embedded URLs likely serve as lures to download further malicious content or harvest credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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=appcompat+v7+free
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/9e17cad73d1a9a7485d16978700f2394/mixanemeva.pdf
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e937a0e269---88712605644.pdf
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/o8ujcqg49kcu475b2g7rstlcvo/4060835262.pdf
    • http://bkbflooringusa.com/userfile/abbey/file/ferubowiz.pdf
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160915121b9267---2592541567.pdf
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/f49b826def8d9ff56d4ff1235db8179a/xopidivavazom.pdf
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5d0b0212d---16173865292.pdf
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094579f59291---femawokutinumez.pdf
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/df9c93251e73ef66ca6c1b4e6527859e/jadomanuvomuleto.pdf
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607baddeb039d---kexozovexabubibekorojila.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16070699a28089---ziwoxuzaxoxirav.pdf
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/92299995caa05034c36647750af7d66a/wotupizoz.pdf
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/8ognnjanls51fb2tj81v0jhn1a/pibelapokus.pdf
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16085186be547c---juvegufivese.pdf
    • http://allasclub.com/campannas/file/80149209955.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d13f.bin
4d5d674db81be2e16e7af4ef678af1e1e0fa1466bf8ff99231b6050e33ec838f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD13F 5080 bytes
font_01_sfnt_off0000e287.bin
c5ce5963f59717e7764064bf95b5a3e021652a2744793c8841ce499c9b5d8fe7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE287 15656 bytes
font_02_sfnt_off00010d9d.bin
02e4cc8d8ef3a4348a1aeb2830231e1336db85f0a0d1b29c65b1a4d69651d677		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D9D 16300 bytes

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