Malicious PDF — malware analysis report

Static analysis result for SHA-256 978b73111d12e19a…

MALICIOUS

PDF

89.9 KB Created: 2021-06-29 17:48:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 39d4ad1d3438a88521a0f19ee2d28cd3 SHA-1: d3270d771765e43d14e0ee5200daef3889423dc1 SHA-256: 978b73111d12e19a7611a906710adcfb224941530895ead4ed9c9fbb7894e068
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links to external websites, many hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://coretry.ru/uplcv?utm_term=silly+sports+and+goofy+games+pdf
    • http://vladjurnalist.ru/archive/file/liximukewi.pdf
    • https://www.epicbrands.co/wp-content/plugins/super-forms/uploads/php/files/c8f21ede6106ead584e8a9515f149c41/jiriwa.pdf
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b0cb79cec64---nebapofagokusafotoze.pdf
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/14a6cf54b70fa6145506a4a027b6bd88/59552750181.pdf
    • http://baggiez.net/userfiles/file/gikere.pdf
    • http://sport-way.ru/img/file/zenuxuzu.pdf
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/2855946fde07259511431be2eb82d78c/kewigavamokosokamibo.pdf
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/6bh0gmpavilleg9rtipmn9ddpi/belijebafifanodisekukima.pdf
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/d251fd82abfa35276ffaf46ae39d6362/zunigubotufofesefok.pdf
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9821ca8a7a---jalozowizelisagilanegijab.pdf
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/7479867ff6473d1ffa6c3f202bb96180/90953923350.pdf
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/95b24be82aa9699f3c496f675f7e420b/6714841333.pdf
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160804a9574722---dipomamujazukofomekat.pdf
    • http://quangcaosms.org/media/ftp/file/xokiroluriwikuf.pdf
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a10d64d1840---74283975681.pdf
    • http://matstravel.ru/userfiles/file/mezadimuzabesurevazakepif.pdf
    • http://losmarinoslanzarote.com/marinarubicon/admin/file/mekejejunewexejovexap.pdf
    • http://xn--80age2amlc.xn--80adxhks/pics/images/file/90364252646.pdf
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071ac7da993f---xesod.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9722b84db---vikado.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/b0b6c25e530eefa7686c3d339a68b46d/zotebitub.pdf
    • https://bulgariapools.com/contents//files/21273803880.pdf
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609128ddc81ca---wemapufedube.pdf
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5ddce0c8d---zolinonunegepomavonokof.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_off0000fbeb.bin
f2232c14ef5f6382bada9f58e8ac43fef675664734b5c274f70024ca9fa4aba7
pdf-font-stream PDF embedded font (sfnt) at offset 0xFBEB 17036 bytes
font_01_sfnt_off000128a3.bin
0fec986a6f4d5fa4c324d4c123783d793c0ddee8a597d45eec804cc0c9c381f3
pdf-font-stream PDF embedded font (sfnt) at offset 0x128A3 11032 bytes
font_02_sfnt_off00014212.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14212 16792 bytes