Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b330737e959029c…

MALICIOUS

PDF

80.2 KB Created: 2021-09-20 20:12:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 20031daf2db3285dad838e4f89e0ee21 SHA-1: a1159406d1c28929a3aa886912326aea3e659894 SHA-256: 7b330737e959029cf88a3ec64ba08d5e34d0dab8b58a37f302aca135f7716923
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier. It contains an embedded JavaScript stream and numerous 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 these external sites, which are designed to lure users into malicious activities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://cructi.ru/uplcv?utm_term=html5+vs+native+android PDF link annotation
    • https://zoorichi.com/temp/fckeditor/file/xipekuwobebun.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16136510c5896b---rexuzozefopozomoputokel.pdfIn PDF document text
    • http://garantc.ru/userfiles/file/91393388520.pdfIn PDF document text
    • http://coeb.eu/userfiles/files/tekezoj.pdfIn PDF document text
    • https://h1t-url12shio-turbo.com/contents/files/novinup.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/52990072994.pdfIn PDF document text
    • http://japhina.com/upload/file/zunip.pdfIn PDF document text
    • http://www.ramseier-appenzell.ch/elrada/js/ckfinder/userfiles/files/50119318761.pdfIn PDF document text
    • http://imoroz.by/upload/file/82310482332.pdfIn PDF document text
    • https://china-glass-mosaic.vegner.com/userfiles/files/20210918_193405.pdfIn PDF document text
    • http://defhjdrjioo.friend-match.com/upload/files/fajalap.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/tamufitopopeko.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/964a1e77ddec6def6f60dadb9355136f/nilowibegat.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/8e67ee334a44ef8201e5248881497bab/62920202724.pdfIn PDF document text
    • http://hzeiger.com/userfiles/file/mejasuvizutifipotam.pdfIn PDF document text
    • http://hferrynetworks.com/FileData/ckfinder/files/20210908_F1884B9EAB729B75.pdfIn PDF document text
    • http://bijverhoeven.nl/uploads/files/97668413435.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148bc302f0d9---50686026672.pdfIn PDF document text
    • http://bfttacg.marketsearching.com/upload/files/41977494549.pdfIn PDF document text
    • http://viswinkelindex.nl/images/uploads/mupedolejutinimefu.pdfIn PDF document text
    • http://thietkewebsite.btccorp.vn/uploads/files/xodasamatuvilafelolegelu.pdfIn PDF document text
    • http://baloneacessorios.com/_upload/file///28588225905.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_off0000d2f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2F6 18744 bytes
SHA-256: 8cc90ebe21a985d054fd0cf3d77a54d11c5b0945588d72e0382c7b92f585cb03
font_01_sfnt_off000102a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ab7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AB7 10600 bytes
SHA-256: ab52c68067682355ad44ed74685fea855a7ce3f8b8e91b7c137e625b11cef843

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