Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcfbf6dab7307fa9…

MALICIOUS

PDF

80.7 KB Created: 2021-09-16 14:55:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ac2f2159bdfdf3e39de1fe8036ef0b5d SHA-1: cd37dbb91de0a65a335a674b3596e834aad62534 SHA-256: dcfbf6dab7307fa987edd612690a14a6378143ca9fa8c2b730f64a04c5cb33c1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting. These links are structured as a link farm, suggesting an attempt to direct users to malicious content or phishing pages. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pistant.ru/uplcv?utm_term=android+check+version+programmatically PDF link annotation
    • http://minhanh.com/files/92884564678.pdfIn PDF document text
    • http://gruaszarate.com/ckfinder/userfiles/files/60424185904.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/bovowibupev.pdfIn PDF document text
    • https://apaman.ti-am.jp/js/ckfinder/userfiles/files/36339653619.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/laberenipenabipibosuvedaw.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/kasexaridawudujudikudivew.pdfIn PDF document text
    • http://conservativista.com/js/ckfinder/userfiles/files/tatoxomozexof.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132ae9cce30d---29876473610.pdfIn PDF document text
    • http://sinhorelli.com/userfiles/file/manekotafosinixofusefo.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/voberepuvuseg.pdfIn PDF document text
    • http://ljjxmining.com/uploadfile/file///2021090116374629.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/5ba4531542ed22d13acc74ede883f26d/9339894671.pdfIn PDF document text
    • http://weilandensemble.nl/ckfinder/userfiles/files/35355756130.pdfIn PDF document text
    • http://www.frank-diagn.hu/userfiles/files/nifav.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/a9ljaoh6rdjco7i23fq9mma39u/marakavasub.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/genorozotiretafunewugodav.pdfIn PDF document text
    • https://paeonia.ch/userfiles/files/7647414484.pdfIn PDF document text
    • http://teamtrinity.net/trinitya/file/25253261966.pdfIn PDF document text
    • http://chinalabware.ru/d/files/vuleg.pdfIn PDF document text
    • https://ap-qatar.com/userfiles/files/24186646011.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f347b2df31---6218017561.pdfIn PDF document text
    • http://slmj8.com/data/userfiles/files/62653186833.pdfIn PDF document text
    • http://arcstema.com/userfiles/files/89269117755.pdfIn PDF document text
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/moxegaxawevif.pdfIn PDF document text
    • http://salamino.pl/userfiles/file/23325209268.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_off0000d136.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD136 11212 bytes
SHA-256: 205b3f4e8bea5fd7ea529285337dc41ebc239212365de0cbfe6ce641f72c10c0
font_01_sfnt_off0000eb21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB21 19124 bytes
SHA-256: afe7bbcbf33ad7e195266fb369bdae42915e1d0834beb9ccfd74458fa9d13008
font_02_sfnt_off00011cb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CB3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.