Malicious PDF — malware analysis report

Static analysis result for SHA-256 74078e7bdfeb81e5…

MALICIOUS

PDF

74.6 KB Created: 2021-09-01 02:44:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 16d6289322bfd0d92bf4acfb4cc5d8b1 SHA-1: 1579e486388e7261db7865cb0731f1d5fb8c96e9 SHA-256: 74078e7bdfeb81e5f8fdc08772e2a23a5bb83f6d5ec4d85c97f3f232b97b0a2c
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories or are hosted on disposable domains, indicating a link farm designed to distribute malicious content. ClamAV and an ML classifier flagged this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 http://connect-event.fr/ckfinder/userfiles/files/vulunutaxizosadegulekoji.pdf In PDF document text
    • http://psychologkmalinowska.pl/ckfinder/userfiles/files/87941713375.pdfIn PDF document text
    • http://longvu.vn/Images_upload/files/mositemulogo.pdfIn PDF document text
    • http://studiobardinisrl.com/userfiles/files/mogejolinexusojalefuli.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160fcbdb96734a---kimekutose.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c795bf383d5---72918883490.pdfIn PDF document text
    • https://fanaf.comarticle_ressources/file/jikixibarogobivi.pdfIn PDF document text
    • https://gegeny.hu/uploads/file/85728451311.pdfIn PDF document text
    • https://senfina.top/uploads/files/kekelewowi.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1606f14385b142---fipuroxijedimupawobafaji.pdfIn PDF document text
    • http://kemenyseprosiklos.hu/upload/file/xivodobo.pdfIn PDF document text
    • https://careersourceokaloosawalton.com/files/public/sixekugiw.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/9a3c6d1e22e71e9e483c70003f4caa07/42300212334.pdfIn PDF document text
    • https://eliteplacementagency.com/uploads/files/sazabuwagokav.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073bf3f94427---42063143382.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/160798aa71730f---palugabomimalunakagasogaf.pdfIn PDF document text
    • https://travelsafeway.com/userfiles/file/79471616790.pdfIn PDF document text
    • http://kuwaited.com/cote_dor_import/admin/ckfinder/userfiles/files/zanewarediditazuv.pdfIn PDF document text
    • http://aylincinarli.com/fckfiles/file/vivumugufajuvalibudido.pdfIn PDF document text
    • http://e-cluny.cz/UserFiles/file/13622147665.pdfIn PDF document text
    • https://ip-pharma.net/data/files/dirop.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/1hii6kma1n20fa4bh82hgrjg27/79035892405.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=the+social+campusPDF link annotation
    • http://perfecturology.cafe24.com/upload/editor/imagefile/bewunimopoxokibilopagadux.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_off0000bfac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d7c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C3 10400 bytes
SHA-256: 7a463d8b2c7f46fd3d57452a6f26c21e71d6bfaf1b3efc8502ffa3cecb691a35
font_02_sfnt_off0000ef49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF49 17320 bytes
SHA-256: d04447f24c45f43e20dc8abad2f7b748b8f46ee9d616eb0efdad01d804282f3f