Malicious PDF — malware analysis report

Static analysis result for SHA-256 1abcdf21b1dc7a7c…

MALICIOUS

PDF

96.4 KB Created: 2021-09-06 13:25:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 588d04ba4674463365568e6d74aac639 SHA-1: e45ad1b84dcd4ddfc1685f9897130971fe40454d SHA-256: 1abcdf21b1dc7a7ca0e9068e90c5118e85b74f03c65342f8c7d7439fb57aec09
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress upload directories, suggesting a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with techniques used to lure users to malicious sites, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

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://crysiq.ru/uplcv?utm_term=how+to+develop+your+personal+mission+statement+stephen+covey+pdf PDF link annotation
    • https://madspot.dk/ckfinder/userfiles/files/98990996165.pdfIn PDF document text
    • https://cailux.lu/userfiles/files/xonuronurobabodivola.pdfIn PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/7el5reir02538t2pgsc4skfs6b/60744463645.pdfIn PDF document text
    • https://toocapen.com/files/67264513951.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/tuwujowagalexusodofe.pdfIn PDF document text
    • https://hoavily.com/uploads/files/78990925235.pdfIn PDF document text
    • https://rmduncanrealty.com/userfiles/files/69312776879.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/bbd7b735fbbde1d4418ee56b29ebf6c8/18507608812.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/bade813bad7e6157146f10d6165f1ee6/wifopoboba.pdfIn PDF document text
    • http://juentai.com/userfiles/files/dowotopebuxuz.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/40eda5cgt2cprndakn7603c97t/8185234819.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/8a98cd73a15c1b0207c089e985428fdc/30045210810.pdfIn PDF document text
    • https://dbmotorbrokers.com/userfiles/file/vaxibotabomubupu.pdfIn PDF document text
    • http://oroblupiscine.it/userfiles/files/nupowibutole.pdfIn PDF document text
    • https://www.spitalmoldovanoua.ro/ckfinder/userfiles/files/91419896578.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16096966218c30---zetajisogewinigali.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/88517679392.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/tolakixo.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d76fd1308c4---durowi.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/6227739408.pdfIn PDF document text
    • https://speakingparrot.com/upload/ckfinder/files/matigewaforor.pdfIn PDF document text
    • https://aymsoft.us/aym_image/files/kusuzosukomanepododomaro.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/43e1a1a58471a0cf83df44662c7858a0/5618784174.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2eb2b1c77---zuvakurenusufuwami.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/79cns7tfbqsk1c7fsug69u57h0/11081768647.pdfIn PDF document text
    • http://centrlita.ru/archive/image/file/xadamulidedu.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_off00011175.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11175 11244 bytes
SHA-256: 6a86fab5067f26a07000df84f14df4eb427df32ea7ceb936a0510359311a7887
font_01_sfnt_off00012b9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000143ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143AE 18600 bytes
SHA-256: 559f3c6a9bfe9e7e3fe815312fa28de482ca2005444afee55597e1796dc54509