Malicious PDF — malware analysis report

Static analysis result for SHA-256 0673f7cde51a1fcf…

MALICIOUS

PDF

87.9 KB Created: 2021-08-14 05:54:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ca30f11ae3f665725ee27573d767164a SHA-1: 37041e9f9f508f36a956dcf3c91c268d647a205b SHA-256: 0673f7cde51a1fcf1aaf5e293383693298ca4477b6b80f0663d3c2e2738b4179
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1059.007 JavaScript

The PDF contains a link farm pointing to multiple compromised websites, likely intended to trick users into downloading malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with phishing and malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://koetec.com/home/~ptow/public_html/ckfinder/userfiles/files/xuruwilowas.pdf
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160724709a7538---doxiw.pdf
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607400ea2fe76---fukawezifojapeko.pdf
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/e1a2d933cd2a7463dc8a0e98af132750/58316318341.pdf
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/16098319f38fd5---24416885923.pdf
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/dizemitubebopefiminisu.pdf
    • http://trips-in.com/ckupload/files/laluw.pdf
    • https://bilalyapidekorasyon.com/userfiles/file/76744302982.pdf
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/81b42e6e13bf0dae976c0579c55cbe02/68390392800.pdf
    • http://galluccifaibano.it/userfiles/file/90446063356.pdf
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e3736767a7e---gabajikogawolovoxerexivop.pdf
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/5fc43bd2e0dde293063b47595b1c05ec/papowagawaze.pdf
    • http://epicridesnepal.com/files/sujenomojusutebet.pdf
    • http://beastyenergy.com/userfiles/file/gukatutamogazilo.pdf
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/57323786970.pdf
    • http://emailreceptionist.net/userfiles/file/jizobakemejup.pdf
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/6s56bbsjov8m9n2dobrg6uknuj/74713500778.pdf
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d5af2d6ba8---53057190925.pdf
    • http://greenplanetnepal.com/userfiles/file/wuwazeduvefozogog.pdf
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079067b53995---11084210836.pdf
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a0449f83cb8---57779021622.pdf
    • https://hoangphatdanang.com/uploads/image/files/76903894254.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=how+to+save+multiple+pdf+as+one+mac
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f01b323baf7---difebopulabej.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f41d.bin
e2b73273817bc647eaa2007aa47119a01fe629d054c005d001924f64aeedd541
pdf-font-stream PDF embedded font (sfnt) at offset 0xF41D 16880 bytes
font_01_sfnt_off00011fd6.bin
41296d942621bef4424daa6cb9341f8fdcf279d82eeab435468116e3e86139fd
pdf-font-stream PDF embedded font (sfnt) at offset 0x11FD6 10924 bytes
font_02_sfnt_off00013927.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13927 16792 bytes