Malicious PDF — malware analysis report

Static analysis result for SHA-256 a22078f4c0ee7380…

MALICIOUS

PDF

75.5 KB Created: 2021-09-07 05:44:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 65a28a9f63c55be0ed4f557a494e23c6 SHA-1: 8205ad0abb3bebb89b12f5a6d88ad52a5b7906a2 SHA-256: a22078f4c0ee738088fe167cb77457639fb2313dc8bc498b3ce9be050a3687e5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many pointing to compromised CMS uploads or disposable hosting, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or delivering a secondary payload via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://pixomot.ru/uplcv?utm_term=atharva+veda+mantra+pdf PDF link annotation
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c02c6dbb156---29491650968.pdfIn PDF document text
    • https://ocbond.org/userfiles/files/50461065514.pdfIn PDF document text
    • http://fge-service.com/userfiles/file/zozurofedotex.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d916d8739a5---61177199516.pdfIn PDF document text
    • https://hobbes-group.com/upload/files/roxajuwolebetaz.pdfIn PDF document text
    • http://www.instalacionescueto.com/nueva/ckfinder/userfiles/files/zuzugewaboju.pdfIn PDF document text
    • https://cakesandcupcakes.net/userfiles/files/tujelodagolenam.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161104dcfca0df---85001435086.pdfIn PDF document text
    • http://tsg-vaganovskoe.ru/ckfinder/userfiles/files/12610667870.pdfIn PDF document text
    • https://aep-tc.com/cache/fck_files/file/xezuv.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608f225e10291---66891638816.pdfIn PDF document text
    • http://zoekidsworld.com/userfiles/file/fifebi.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/xesivuj.pdfIn PDF document text
    • http://miryangpension.com/FileData/ckfinder/files/20210707_B3C7D2DB1B75F6B8.pdfIn PDF document text
    • http://wjvanderheidedienstverlening.nl/uploads/file/fasibabodakuwiserolula.pdfIn PDF document text
    • https://keongracun.org/contents//files/dujunikenuzetoriwixiwes.pdfIn PDF document text
    • https://office-agglo-larochelle.fr/userfiles/file/wukej.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/napaw.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160837b548052e---63509509508.pdfIn PDF document text
    • http://arablift.net/userfiles/file/75061204215.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161296ff86e1b6---munedimevabixami.pdfIn PDF document text
    • https://holcom-wd.holcom.vn/webroot/img/files/matazuwezirasu.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b4037aef4b0---nimufezeja.pdfIn PDF document text
    • http://portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/52381948580.pdfIn PDF document text
    • http://maciejabramowicz.pl/upload/files/file/romababoduvej.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_off0000c4cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4CD 10384 bytes
SHA-256: 637b5f2da06c2ab5000953d872b4abca6c0fab9d254ce9f884e2f1aeeab1ec34
font_01_sfnt_off0000dc1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC1F 17204 bytes
SHA-256: ab585d50258999236cde8d92752779460074c6b939667e6f948b3f10f3560776
font_02_sfnt_off0001086a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1086A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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