Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cf0899a2105acaf…

MALICIOUS

PDF

79.2 KB Created: 2021-09-13 04:37:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 235cc514ca38ab4430e7e8e5c74ca743 SHA-1: 6c675a99426f9ce6fa25db8aa5d1888d017eb086 SHA-256: 2cf0899a2105acaf6251eabb018da22b01fa07e15d2409b0a650777e655da521
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to disposable hosting or compromised CMS upload directories, indicative of a link farm or SEO spamming operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://lex.tj/img/file/sodiluvavip.pdf In PDF document text
    • http://arucax.am/user_images/file/98094564571.pdfIn PDF document text
    • https://seo-methodes.com/userfiles/file/malononifejiwuwam.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/38362157883.pdfIn PDF document text
    • http://trieuduong.com/images/Download/lagozoponoxiki.pdfIn PDF document text
    • https://champion-osk.pl/userfiles/file/74436979494.pdfIn PDF document text
    • https://manhalhealing.com/userfiles/file/tonobupimavelezisudolu.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/nexupepudevavoziseku.pdfIn PDF document text
    • http://www.dr.schure.net/ckfinder/userfiles/files/sisajev.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/er8a1b939poof07kpecdvjcms4/fewajavejegigafotodowevu.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/pewakadezawuzoj.pdfIn PDF document text
    • http://gaia-onlus.org/userfiles/file/jurirenejakew.pdfIn PDF document text
    • https://xyoaa.org/sites/default/files/files/tamelume.pdfIn PDF document text
    • http://stsmcc.org/www/js/ckfinder/userfiles/files/sejutel.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/88436924794.pdfIn PDF document text
    • http://bahtiyardishekimi.com/fckfiles/file/kewokafurevoxemanati.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c39c52a531---wiwewu.pdfIn PDF document text
    • https://houstoncoinshow.org/FCKeditor/file/11751782471.pdfIn PDF document text
    • http://duda-tech.pl/dudatech/upload/file/3155555595.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e01ba920f8---nizupakewowulip.pdfIn PDF document text
    • https://ppkh.net/userfiles/file/bajolorakofuratagu.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/267f32a90888dfcd6540a3c923407bdf/54131479256.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=free+gems+for+yugioh+duel+linksPDF 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_off0000c9eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9EB 19988 bytes
SHA-256: 4a05d2edc6230941b9e44eff45c469813b6654511fb2801353c94f363d57d2a5
font_01_sfnt_off0000fe75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE75 10824 bytes
SHA-256: 23b469a4a74b84757cfc1460358e6647ddf5842bea766a778ea4924e02da30a4
font_02_sfnt_off000116f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1