Malicious PDF — malware analysis report

Static analysis result for SHA-256 de5878ee19e068b7…

MALICIOUS

PDF

83.1 KB Created: 2021-09-07 10:23:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cc3ca1b91ab07e4a40d9a7b257c0f8d8 SHA-1: 5d9169e60268ea25dcfe10fc51f2c3eb05b8f5db SHA-256: de5878ee19e068b770723095aee9b54112a257709fedf2cd7af9b39b506982f9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to phish users or lead them to malicious content through these links. The document's structure and URL patterns are consistent with a link farm designed for SEO manipulation or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://bmsorganica.com/userfiles/file/rebixonaluwox.pdf In PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d92623048b---zofafetapewut.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b614868c5c---bekogawow.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16079595504792---zujada.pdfIn PDF document text
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/bebugejulipinanavox.pdfIn PDF document text
    • http://japan-railpass.info/images/blog/file/25378023098.pdfIn PDF document text
    • https://egyseg.eu/ckfinder/userfiles/files/taxiv.pdfIn PDF document text
    • https://restaurant-kamkok.fr/img/Data/file/79308880438.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb81cefe58---kiribamazozudaworepolite.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b522b18cf8---19720945912.pdfIn PDF document text
    • http://zzzwchem.com/upload/files/87095070946.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/473mq1mva6lpdf5u14k3cpv6b5/pafafebutakewevimaki.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/48a3a6bfdf346abb959d94b8a48288a8/kaxarobewe.pdfIn PDF document text
    • http://webhenevents.com/clients/868374/File/jupetelesobuwonape.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c89f20772eb---gitedowopat.pdfIn PDF document text
    • http://statsale.com/data/upload/ck/files/72704259689.pdfIn PDF document text
    • http://khamtribacninh.com/images/files/sunovatutipozinasipep.pdfIn PDF document text
    • http://alarmy-kamery24.pl/userfiles/file/kadozifogoganasadat.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/90360810f2497ffe9b4f47ecfbd8746c/kusixixapuzevifajig.pdfIn PDF document text
    • http://d4squebec.com/clients/f/f5/f58105ca183540932673f5bf18e62671/File/43576812392.pdfIn PDF document text
    • https://werbemittelag.ch/upload/file/mitisobozit.pdfIn PDF document text
    • http://longarmquiltacademy.com/fckeditor/userfiles/file/wigovofur.pdfIn PDF document text
    • http://quaker1960.com/clients/3/34/346d0055920ff30d27c63167e405b0e7/File/58153076300.pdfIn PDF document text
    • http://europavloeren.nl/siteimages/file/3104610642.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=shrimp+farming+business+plan+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_off0000e095.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE095 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A7 17484 bytes
SHA-256: bf80f1d5a0581b609e9120f5d4ac3ea6a090d4625f987d8952cf6bfa2a9a201c
font_02_sfnt_off00012574.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12574 11044 bytes
SHA-256: e808bf08b51ec13fda71b8393f3f5a14389d2f7b0d8ebd3662d3a7ccbdc79b9c

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