Malicious PDF — malware analysis report

Static analysis result for SHA-256 580b77e910e7685a…

MALICIOUS

PDF

102.0 KB Created: 2021-07-06 08:54:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 40fa22b59394ec141f3f8074ca4d3f23 SHA-1: 10a1529e090cf13f5f86ed2a5cec6d977a407cf1 SHA-256: 580b77e910e7685acea6caa0c05185b6e1e28c02969c81ca0321cbcb80033e35
164 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 embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites or disposable hosting, forming a link farm. The embedded JavaScript likely facilitates the redirection to malicious sites, contributing to a phishing or malware distribution attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9874

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 http://lab4050.com/upload/editor/file/wefaxutogokejanevat.pdf In PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/621d478aa45afc543e2a62f09d60b4b2/75728385940.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6bd866be3---60947208436.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a43a2cd3671---sulerifulojawudat.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/c10e24129c5771f4c208c905dbdfac26/40446852715.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/tafrhe2t9ibo5kq9mul19h7pu4/54537214162.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160d6a36e45520---34886277944.pdfIn PDF document text
    • http://1137.jp/app/webroot/js/ckfinder/userfiles/files/zerotedekarutiv.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160d8ed06a3f01---50227229589.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087409cdc527---vemewonokoxesamotedakeme.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/16094c97050dea---rasitovexovarum.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/60a4cf2c28bb895aabcff37656849192/pesewasinakurata.pdfIn PDF document text
    • http://jirehenl.com/userfiles/file/181555408059.pdfIn PDF document text
    • http://gld-lining.com/user_img/files/kivakaleredetapakufem.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072fd7bcecf9---varelututidelipukefepoga.pdfIn PDF document text
    • http://sushi-belovo.ru/files/duwexixivirasuwipuritim.pdfIn PDF document text
    • http://ifa-astrologie.de/userfiles/file/99567400696.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ae38ff1fe93---benanupenelojo.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/b8aa69c78643ad5e2f9b47426519ddd7/kovegoj.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/85758359956.pdfIn PDF document text
    • http://ipmarketing.net/userfiles/file/fovazuba.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16079bcbd7bdae---bajujaneb.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160887ac2ca843---12251498971.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/2cbb80f3cc60b5c6f8549448c39198a8/7173585549.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=cherrystone+campground+military+discountPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011ddb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DDB 1692 bytes
SHA-256: 6df00093d1a1fd8b8f95901b42ba2863538c90606311dd4adf1993a433792d13
font_01_sfnt_off000125e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125E4 11208 bytes
SHA-256: 7c8c827d065c406f9ed529a5a65c6cb2567e5286cfcf285357258f95b9d9ddef
font_02_sfnt_off00013fca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FCA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000157dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157DC 19100 bytes
SHA-256: 67fb88ab39c66c5cd87ffe1866910dca67a3fa652576e633a7039918355be501

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