Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ac53c5a4cdc521b…

MALICIOUS

PDF

78.9 KB Created: 2021-07-15 23:04:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 0c6027c7fe695400be51845cf22ac764 SHA-1: b92c7b1db9ed0ff407acf282e9e1158c4b2d59a6 SHA-256: 7ac53c5a4cdc521b353fc007d8929809504f299e299091c697d53a749bf9721e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics as containing a link farm, with many links pointing to disposable or compromised hosting domains. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. The embedded URLs and the nature of the heuristics strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://aradovan.com/userfiles/file/6358840019.pdf In PDF document text
    • http://asiavent.com/UserFiles/file///96157049414.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160edee8d1a028---65970576099.pdfIn PDF document text
    • http://paoladebenedetti.eu/userfiles/files/89275137136.pdfIn PDF document text
    • https://fibaquitaine.fr/cebatrama/userfiles/files/revuzelotiponawagabofo.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/0ea5eb7b50458b6b333e73b49b740a00/4149573367.pdfIn PDF document text
    • http://kaithompson.com/userfiles/file/64337524335.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608cbdcbf253d---74347565113.pdfIn PDF document text
    • https://rajaketiga.com/contents//files/91648651980.pdfIn PDF document text
    • https://mygoaltv.com/ipp/images/uploads/files/doworumejutisokubabuxe.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/tu5f2bhueofge4hi2rrd1bf551/kusibogabezusasisebavi.pdfIn PDF document text
    • http://zonwering-belgie.eu/ckfinder/userfiles/files/86491651133.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/zovar.pdfIn PDF document text
    • https://jin-ji.com/upload/files/jevenejosaf.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e48ac2b67---89278997916.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/2addad3596296e4bf71d6254070b93b6/luzowubajo.pdfIn PDF document text
    • https://atl-50.com/files/file/51578156628.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609a2af680baf---segebavitugizomanazinama.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/62868897310.pdfIn PDF document text
    • http://demkapi.com/resimler/files/33942038389.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/8da2jsh1qb42raokpsrtaadn73/sijose.pdfIn PDF document text
    • https://tskrea.com/userfiles/file/meretaximifen.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/ea161fef58ea56091b473ee91e2a107c/sipulufujesuwoti.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/a0507be00d9f13fa5b9bc054b68ef487/35664144383.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd5f4c6d8f---xotumubifinazumaliligibeb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=deception+meaning+malayalamPDF 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_off0000d2cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2CD 16556 bytes
SHA-256: b8903ea2c1017e001c32e7ba89aabe431518448afe0df54dd08d3e34d4ef1a3e
font_01_sfnt_off0000fdf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011610.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11610 10564 bytes
SHA-256: 0c1f4fdb9e479fdab3ea6b420dbce4dda8809e8b4ee4c6247166e47f8cca2674