Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a6bdb411a946025…

MALICIOUS

PDF

82.4 KB Created: 2021-09-12 05:50:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 18bce97eb5ed28c314342b47293b811e SHA-1: 26f951b0a69d8dbd67907e8be09f9578b2d65d07 SHA-256: 6a6bdb411a9460252bc1e0bcdc40fa9b54b0c5a3a3a7ca004dc1ef8268bfe83d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious. It contains embedded JavaScript and a significant 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 or further malicious actions.

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://psiakocky-potisk.cz/webpagebuilder/ckfinder/userfiles/files/simuzuxegutom.pdf In PDF document text
    • http://hiroi-es.info/yamituki-n/uploads/files/lojukakikavevoxorip.pdfIn PDF document text
    • http://nilesk.com/userfiles/file/mukegovekekopudemabizora.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/16136b341b0a45---10120393330.pdfIn PDF document text
    • http://antitumor.org/filespath/files/20210912091249.pdfIn PDF document text
    • http://autowagon.it/userfiles/files/30155778597.pdfIn PDF document text
    • http://podolsk-kondicionery.ru/upload_picture/file/881199317.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612ece85970b7---72651581968.pdfIn PDF document text
    • https://bluza-shop.ru/content/File/49011670185.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613042ccdeb7d---revopojatusam.pdfIn PDF document text
    • http://tanabuauto.com/js/upload/files/80277118905.pdfIn PDF document text
    • http://xn--80aafjbaeihgganggf9ajkncugh2a.xn--p1ai/pict/file/fiboremowubegamewo.pdfIn PDF document text
    • https://bocrangsuthammy.vn/upload/files/98212901225.pdfIn PDF document text
    • http://inhome360.ru/admin/ckfinder/userfiles/files/bixaxerina.pdfIn PDF document text
    • http://dubilex.com/userfiles/files/fegag.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/161383c334d07f---xezudozawosabutunapunolaz.pdfIn PDF document text
    • http://martonaroniskola.net/userfiles/file/17082990516.pdfIn PDF document text
    • http://freetds.net/userfiles/file/nutigome.pdfIn PDF document text
    • https://dichvuhappyhouse.com/upload/files/tatopo.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/pubesenebid.pdfIn PDF document text
    • http://skyrun-arser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210905161806773796kfj5ua.pdfIn PDF document text
    • https://www.kindspring.org/inc/ckfinder/userfiles/files/vejuwolusakopitememug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=control+center+in+androidPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB3D 10224 bytes
SHA-256: 057801c8725f9654585f6981b16a09d82b9cf8a08f84c515f220c1d089af33b9
font_01_sfnt_off0000f24d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF24D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A5F 18900 bytes
SHA-256: f73b0016b6680227a1820f30bf0343621edcb1eb846b3102437b8f4984b883bc

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