Malicious PDF — malware analysis report

Static analysis result for SHA-256 44519a8fa677ac7d…

MALICIOUS

PDF

86.7 KB Created: 2021-09-04 07:32:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 38d7ab1e65d07af8097fc5f42743d021 SHA-1: ec0325970898874ee829296f76128e79ef038d87 SHA-256: 44519a8fa677ac7dc8c2824bc7984f9686092628f3f0b2773aacf7e5661706b4
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised websites hosting other PDF files. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of distributing malicious content through compromised infrastructure. The ML classifier and ClamAV detection further support the malicious nature of this file, suggesting it's part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://chongros.com/userData/board/file/jubosirenufijes.pdf In PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bcf8e9dba53---xibomirodawijumebupuri.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b200e0f2979---76539444730.pdfIn PDF document text
    • http://fewo-spreewald-schoetzigk.de/brandenburgtag/img/editor/file/wetovotivupalim.pdfIn PDF document text
    • http://aliglobshop.com/userfiles/file/zogapawisugujuwilo.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/ce72e69718dbe7944746047835b41bfe/tijadivenaxidunuzixas.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/uanskgtfqfvbah4l04hjap6hd3/fubipaf.pdfIn PDF document text
    • http://fitviewer.info/files/file/rilokofojinesamikopow.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608e3259a68ec---14550958124.pdfIn PDF document text
    • http://www.77ice.com/upload/files/90983511249.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c162c9a526---56859949759.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/hvd0c5pu03q6mk9qlo7fsg4ho6/datupikupaterotukekarovug.pdfIn PDF document text
    • https://debcopharma.com/userfiles/file/depoxewilumadodazejudet.pdfIn PDF document text
    • http://westernmaki.com/uploads/files/7692219721.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160f7b08d37d1f---30228280534.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/6586412113d1479cc21049177d2f9011/77633384407.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/71602450942.pdfIn PDF document text
    • http://matras-devison.ru/upload/file/zolisejofajele.pdfIn PDF document text
    • https://menokatea.com/ckfinder/userfiles/files/jexumapukesutomusesod.pdfIn PDF document text
    • http://viswinkelindex.nl/images/uploads/56666134777.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/lulatazo.pdfIn PDF document text
    • http://slsnn.ru/content/files/menali.pdfIn PDF document text
    • http://sylvianapoles.com/clients/e/e6/e63d90d46a840f0b3195f531cec11f6e/File/lojeni.pdfIn PDF document text
    • http://geluidsadviesnederland.nl/ckfinder/userfiles/files/pezolubimu.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb07306e7f---fumitomimufukenisev.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/62d099e34cd0248618c21e883498b337/98226838343.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=30+rebounding+drills+pdfPDF link annotation
    • 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_off0000e4eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4EB 10848 bytes
SHA-256: 013808f5af8545821c7c4f708f21a5725a846234cd1a3627d180a676768f0b9f
font_01_sfnt_off0000fd8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD8A 21232 bytes
SHA-256: 6904fe8b6d25ca3864024383343e6041a40235ff627e8a8dc0d410f27ff2b293
font_02_sfnt_off000134cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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