Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cd63a21e3e06dd5…

MALICIOUS

PDF

74.3 KB Created: 2021-06-29 06:47:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 5aacce46f3741164f8a44e4d666d6024 SHA-1: ee5703079e21b6d9437af5d6ef07ac9ee7d6f388 SHA-256: 7cd63a21e3e06dd554db3cd73c3620ff9fe7d0c43dca9bca72b11455b2aadc75
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous external URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and the overall structure indicate a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://nomylo.ru/uplcv?utm_term=assassin%27s+creed+black+flag+book+pdf PDF link annotation
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/aafb1b238d213c5537befb92423efb3f/84220252574.pdfIn PDF document text
    • http://salonorganica.ru/upload/files/bamoze.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a8eb91adeab---gefonixasemotemu.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3068733b6---91078490530.pdfIn PDF document text
    • https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/d43df9d53738cde2190eb95e702656e5/49473517581.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/709d99o4jjb3c2r3dhgtiorrr3/meresudubud.pdfIn PDF document text
    • http://bidhichand.org/sahodyatarntaran/userfiles/file/menamaminumixageza.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a99fc6221fc---lopivojabanodu.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/pekudevife.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/lepidikixam.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/ladosuvebidupigexolus.pdfIn PDF document text
    • https://wisserarm.nl/app/webroot/files/userfiles/files/siramedabap.pdfIn PDF document text
    • https://costabravas.com/uploads/localidades/files/27536980760.pdfIn PDF document text
    • http://timapools.com/uploads/files/dopimaranibimajosagolubu.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16086ec44350f7---59665229235.pdfIn PDF document text
    • http://hit-air.pro/ckfinder/userfiles/files/10727565620.pdfIn PDF document text
    • http://shipsupply.ru/userfiles/files/fekipufuzolukovozolilo.pdfIn PDF document text
    • http://momsystem.ru/public/file/53477122462.pdfIn PDF document text
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16072423e6d93c---63264040687.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609fcbe785c6e---lemajolixidi.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/dositovakajaketupewos.pdfIn PDF document text
    • https://24emk.ru/ckfinder/userfiles/files/73702851715.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/2f39a725ab7dbb67ca859dc83298acff/19843243279.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16081b79bb8725---lodulebu.pdfIn PDF document text
    • http://school19-zav.ru/userfiles/file/gonepuxupul.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_off0000c0ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0EF 10944 bytes
SHA-256: 8ce63c6da6cb797f682eae27325d0816a9f96b971660febf616bb770b3c3cc8d
font_01_sfnt_off0000da04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f216.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF216 16236 bytes
SHA-256: 8f2496eea6939471aeb82db2eae6ec69ecc242ba66b5b5ee1489b95e2255653a

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