Malicious PDF — malware analysis report

Static analysis result for SHA-256 3195f27c27109197…

MALICIOUS

PDF

72.8 KB Created: 2021-09-04 18:06:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5beef870382fa2497b939767e2236d7b SHA-1: bd07887cac3d1e3c4338c8534979b4ecb7bf275f SHA-256: 3195f27c27109197f5634dc38fc0613751aa880ac4a694443fa2d0d6b9e522ca
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to lead users to malicious content. ClamAV detection and ML classification confirm its malicious nature, likely serving as a phishing lure or a distribution point for further malware. No scripts were extracted, and the document body was unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • 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://drafthe.ru/uplcv?utm_term=list+of+participle+adjectives+pdf PDF link annotation
    • http://terezmisszio.eu/files/file/17833582660.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/1611ab25044a81---73686177171.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/a10266c09f0dda30ba28433e461f15f2/sobuvuze.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/34c2950fb86a17468faa2d2d3dc0f03d/pamosubepuzofosaz.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a3c2518df3f---zufibasuxudasipuz.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/d0594fd389add1f5f809cdb9144ab47b/13574710921.pdfIn PDF document text
    • https://simondaulte.com/ckfinder/userfiles/files/jelaxegiwupilaz.pdfIn PDF document text
    • https://samuelben-horin.com/userfiles/file/kexigafenodivuxawaxala.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/8b2cf519f3336d132d5b05c20e30910a/mezidobafesinezofapa.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/59641375171.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/oot98c4hemhcamdncbp8kc53ja/89517296175.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-6-27/20210627125557692453.pdfIn PDF document text
    • http://ibshop.gr/uploads/_uploads/files/81645816357.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/pekomuxufavisafafofebog.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160931938df6c7---22073301242.pdfIn PDF document text
    • http://www.hydro-tg.pro/upload/file/moxarepowuzafutawijogapo.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/4l5qo8n943fsrd46f7pk8n38vh/larudasudufatixuga.pdfIn PDF document text
    • http://teraval.cz/res/file/sufolemudubazodexijeke.pdfIn PDF document text
    • https://globalmediaminds.com/uploads/files/fonejojuduveliwuto.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/94704702408.pdfIn PDF document text
    • http://mobil-tech.com/files/jebulizisofose.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/domomobuzerabi.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092affe395ef---75322705440.pdfIn PDF document text
    • https://mayurherbal.com/userfiles/file/motugobojukelipefijab.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_off0000b9d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9D8 16920 bytes
SHA-256: fe37503c8efa9bb3050d0120382252f0c9589b1d7bc345737cccee306c477a12
font_01_sfnt_off0000e47d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE47D 10660 bytes
SHA-256: 570bee1972eee964454a6d432329529343dc85bc4a7e17ccf99871accfaf7648
font_02_sfnt_off0000fd13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1