Malicious PDF — malware analysis report

Static analysis result for SHA-256 815f0b6b1937715f…

MALICIOUS

PDF

95.4 KB Created: 2021-08-19 21:06:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4dea8607e7bf3e75e026a7b8e388aba4 SHA-1: f357bfb1b1c1d01557dbc7788b1e24f26583de01 SHA-256: 815f0b6b1937715f61650b4b8771451a437d283ff66b6337c5be81a9d7bdd74f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains an embedded JavaScript stream and a large number of external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The embedded JavaScript likely facilitates the execution of malicious actions or redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

Heuristics 7

  • 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.
  • 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://queure.ru/uplcv?utm_term=how+to+file+an+investigation+report PDF link annotation
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/6b887f8cd0ad8d275cfa86db954e100f/fazijemazaned.pdfIn PDF document text
    • http://shipsupply.ru/userfiles/files/72424785839.pdfIn PDF document text
    • http://studiolorenzino.eu/userfiles/files/46575747215.pdfIn PDF document text
    • http://gardenofsound.com/userfiles/files/44531762026.pdfIn PDF document text
    • http://studiobaliva.eu/userfiles/files/lenodoguvabavopunej.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///sirosusavare.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/56d72f11dc240945f4f3e7d1a7a956d0/33600138170.pdfIn PDF document text
    • http://hourinkan.net/js/upload/files/93938753133.pdfIn PDF document text
    • http://bobhendrix-law.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dijotokurej.pdfIn PDF document text
    • http://emrc.ie/upload/imagecontent/file/38198988353.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160890fe753970---22481924135.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160be8fb50bdb7---tuwepiwiz.pdfIn PDF document text
    • http://speed-r.com/js/upload/files/keriribozurubigido.pdfIn PDF document text
    • https://aspirans.com/files/file/dabujod.pdfIn PDF document text
    • http://ohana1bbq.com/uploads/files/749244503.pdfIn PDF document text
    • http://aj-logistics.com/stock/userfiles/file/29055249815.pdfIn PDF document text
    • http://solarwindependence.com/ckfinder/userfiles/files/40928181076.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609566f18421e---58553012968.pdfIn PDF document text
    • http://sansboundaries.com/clients/f/fd/fde0d4b6b324343791c5f0705b221951/File/81020465100.pdfIn PDF document text
    • https://groupunsur2.com/contents//files/pekufezawesexuvodijas.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/94029647771.pdfIn PDF document text
    • https://livre-d-art.com/ckfinder/userfiles/files/nefilodapoli.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16091f4d51859b---72405353634.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb1da5a4b6---33856718235.pdfIn PDF document text
    • http://bakerfamreunion.com/clients/1/13/13be4b03bdabdd3a133c3ee64ed6201b/File/duman.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160858f2d21bd7---dekowud.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_off00011205.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11205 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012a1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A1C 10676 bytes
SHA-256: f83c6d29cf12550386de61d42dbc03630cf097529db5490cd035aef97950efd9
font_02_sfnt_off000142b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142B7 17092 bytes
SHA-256: 8fb64abaf2a56cee6c007d4453063c85e5afcc503b803f935488cba2e9fa7f3b

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