Malicious PDF — malware analysis report

Static analysis result for SHA-256 85a63258e1158910…

MALICIOUS

PDF

80.4 KB Created: 2021-09-24 01:08:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2d3604e246bd3fa777bc1f2aaacb93cb SHA-1: fb0c3428ae0a3e43b37500b4e18a1bb2ab2dd245 SHA-256: 85a63258e11589105c5e87a242b10ac92e912be71c1d84b07bcdd35bfac7a262
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous links pointing to compromised WordPress sites, suggesting an attempt to host and distribute malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The presence of a link farm on disposable hosting further supports a malicious distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16141b357224a3---kinexemesipo.pdf In PDF document text
    • https://biographiewerkstatt-singer.de/userfiles/file/72159442781.pdfIn PDF document text
    • http://awarelaxcentrum.cz/user_files/file/35781870263.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/91008905407.pdfIn PDF document text
    • http://www.facyt.com.ar/ckfinder/userfiles/files/pujawexe.pdfIn PDF document text
    • https://landbar.com/app/webroot/js/ckfinder/core/connector/upload/files/56470022787.pdfIn PDF document text
    • https://cancelaria.pl/galeria/file/32850609600.pdfIn PDF document text
    • http://sziszolg.hu/editor_up/84443982433.pdfIn PDF document text
    • http://sns-russia.ru/userfiles/file/15836862246.pdfIn PDF document text
    • http://allgeology.ru/ckfinder/userfiles/files/98418514541.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16132b5635d492---befobozowu.pdfIn PDF document text
    • http://111-orte.com/testarea/cwsCMSlight/media/files/ramiferabofakupe.pdfIn PDF document text
    • https://sharpconsulting.us/app/webroot/ckfinder/userfiles/files/5921052166.pdfIn PDF document text
    • https://quangcaowebsitecomvn.xemlaco.com/uploads/files/71989990379.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16148a8ce60223---nukodo.pdfIn PDF document text
    • http://ibnuaffan.com/ckfinder/userfiles/files/jixijeko.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/kuzukem.pdfIn PDF document text
    • http://mywayrtk.org/userfiles/file/23704744455.pdfIn PDF document text
    • http://zkqzl.com/uploadfile/file///2021092123175432.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021091123050131225.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141781240035---27872587307.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614cf1abefb19---46557190838.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=xlsx+to+apkPDF 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_off0000d3fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3FB 10016 bytes
SHA-256: 60e1bc528c6780d3be7d3c03e2ceb7121d08e1ef2cdfd0c18c5134fabebfd9ab
font_01_sfnt_off0000ea5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA5E 19464 bytes
SHA-256: 44a290908e7a0259f540bb1f6641d9c8f62e3b3859d46d808fadf31186f37378
font_02_sfnt_off00011c74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C74 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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