Malicious PDF — malware analysis report

Static analysis result for SHA-256 156ae7069676ebb6…

MALICIOUS

PDF

69.1 KB Created: 2021-09-26 01:32:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ba20ee12c173bb797de9a12113dd7463 SHA-1: 0fdc0215f88217a7d4001c3ef9e6883ac0783240 SHA-256: 156ae7069676ebb6c24ed145c0e8a282fe02a55d8a6893c7c4e7a4573c0aa1da
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or link farms. The embedded JavaScript likely facilitates the redirection to malicious sites, contributing to a phishing or malware distribution attack. The presence of compromised CMS upload links further suggests malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://drafthe.ru/uplcv?utm_term=p+words+to+describe+someone+positively PDF link annotation
    • https://hotel-la-licorne.fr/userfiles/file/dokidi.pdfIn PDF document text
    • http://woodwaysindia.com/uploads/wudanipuriwepalamobus.pdfIn PDF document text
    • https://www.puskinas.lt/ckfinder/userfiles/files/30671241766.pdfIn PDF document text
    • https://maviet.vn/upload/files/66017355577.pdfIn PDF document text
    • http://salocchi.it/userfiles/files/miwemedifigulunukixome.pdfIn PDF document text
    • http://papienbanana.com/user_file/file/tobubeninekaw.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/15833318212.pdfIn PDF document text
    • https://consultemergingmarkets.cubsindia.com/files/44080737798.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16131c6e13568a---3583057452.pdfIn PDF document text
    • http://aotwcasino.com/ckfinder/userfiles/files/walitipalanir.pdfIn PDF document text
    • https://samsungdvmklima.com/upload/ckfinder/files/14532524695.pdfIn PDF document text
    • http://sweed-trans.eu/ckfinder/userfiles/files/71396562581.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/a13248b826be626491787190a4a9a535/tutur.pdfIn PDF document text
    • http://www.llmhospital.com/www/js/ckfinder/userfiles/files/lesoviromibatujidozatul.pdfIn PDF document text
    • http://steakpluspizza.us/userfiles/file/61129512586.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/dikuvemuzuzarabumo.pdfIn PDF document text
    • https://jurvamartin.com/userfiles/file/81629141790.pdfIn PDF document text
    • http://classicalgardenfountains.com/uplds/file/99163166888.pdfIn PDF document text
    • http://yingtailong.com/upload/file/210909165939334874lzn2knlreyvm.pdfIn PDF document text
    • http://matonaklawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nolisujoxog.pdfIn PDF document text
    • https://worldmedglobal.com/userfiles/files/bivikozuz.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1613f495fdb19c---bovizezuxozapibot.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/161435919b0cc6---97153443021.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ad2861208c---52569651963.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/75041986531.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_off0000b15a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB15A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c96c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC96C 14444 bytes
SHA-256: d62bfc5e10790b6191cfc6ccde1ae14bc0df45340364af21e98b59e1383c28d8
font_02_sfnt_off0000edaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAA 10920 bytes
SHA-256: 683b54cb8b6c557df89de868839051e21bd1a09a460825b27a0b11bb6d01c3bb

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