Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2f76b8d8adeb3d2…

MALICIOUS

PDF

84.7 KB Created: 2021-08-04 16:09:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fac433ef948474f6a261f769a778d3d3 SHA-1: eacc91957881543b9c81be63442e0f8981458fb0 SHA-256: e2f76b8d8adeb3d29ebc2d368519f2afc9108d8ca47088d78e981b4975fa116b
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely serving as a lure for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/60aec2d605c9a01cd8b478d76a7eb7a0/65189561374.pdf In PDF document text
    • https://smartech.lv/sites/smartech/uploads/documents/files/35819168154.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/595d654ee6a696727ad57c5559f94605/57752376323.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/vffp8krb3l51r5eo9dv40h7bs6/32981309163.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160f77bf91f486---63329342299.pdfIn PDF document text
    • http://triatlonbizuterie.cz/sites/default/files/file/koxal.pdfIn PDF document text
    • http://sanarina.de/ckfinder/userfiles/files/fepomogerawewis.pdfIn PDF document text
    • http://dzbnf.com/upload/file///gidusige.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/b0fa4f187d15f99172f79dd20d57dc19/kegel.pdfIn PDF document text
    • http://immobilieninvestors.eu/userfiles/file/kudesozogulomulaveroz.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/hqqvppfvbv5t3os13hdv39j511/nupunedi.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/63874454042.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/cda7735f5db3284b40f324784b80d2c6/16687875905.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160a0867e92953---foguzokupatawun.pdfIn PDF document text
    • http://grandchainfamilyfoundation.com/clients/85333/File/58463658746.pdfIn PDF document text
    • http://ylgems.com/file_media/file_image/file/gezupijapero.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160703a31497ea---30782859578.pdfIn PDF document text
    • http://cnokorea.com/userfiles/file/pulob.pdfIn PDF document text
    • https://papiratisk.cz/soubory/rixeka.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/86840827151.pdfIn PDF document text
    • https://eravukappalpalli.com/userfiles/file/ronixebadijim.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edf2e860975---56451568994.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+cure+dependent+personality+disorderPDF 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_off0000e844.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE844 10800 bytes
SHA-256: 0a459fb8940219eaf097fad9ecfeb8efe1409ebdaa5744a230f551388f548eb3
font_01_sfnt_off00010145.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10145 16228 bytes
SHA-256: 84ffaeedbd078f8edc4867a570f0c40f8ef45a34090b1b54e68e1466d91eb9f3
font_02_sfnt_off00012b4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B4C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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