Malicious PDF — malware analysis report

Static analysis result for SHA-256 11b7c0e864127758…

MALICIOUS

PDF

130.8 KB Created: 2021-07-06 21:17:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 6614bf94a0c18010d97ff3799adad578 SHA-1: 845b360dcecf2000505d0179f27981a8f5046339 SHA-256: 11b7c0e86412775831740d7c721cc37ce6d2b2bd5f17a0785d3fe738b0cd860e
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and link farm heuristics confirms the document's primary function is to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9757

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 http://lindseyderence.com/userfiles/files/mimuzu.pdf In PDF document text
    • https://elnativocoffee.com/silver/upload/files/48574075277.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/9fa5a5f78bf2d2ba31f4a8980b10f7cc/bajunowipixotozuzeb.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b38fc6ac773---jeretijoxuxuwida.pdfIn PDF document text
    • http://caryhigh1987.com/clients/41333/File/zibofixifuruditazeduf.pdfIn PDF document text
    • http://cba60.com/clients/6/6c/6c2dd71b6188bc8e8f5adc6209c6f86c/File/51761732234.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/89514255441.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ea4583f48a---norokuzowazulijasezavepi.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607148897402b---41656856600.pdfIn PDF document text
    • https://bgmediation-flm.com/userfiles/file/73992664523.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/ittkgm6phdg5hb747vmpeeu4n9/lilarivenomitiwuzi.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/16075012a6e041---likimipupemerun.pdfIn PDF document text
    • http://massarentearchitettura.com/userfiles/files/26326027525.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/99dbgflf76klfihpdvfc98j80h/89440053849.pdfIn PDF document text
    • https://gs-hemeringen.de/ablage/userfiles/files/dudegifebojezenavun.pdfIn PDF document text
    • https://miguktour.com/FileData/ckfinder/files/20210616_A641F5749CA14422.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/68hgm3ehl1v700ptr482g88s17/kowubejinagijajexukoru.pdfIn PDF document text
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/70731173061.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090988367e4a---fokejiralamorakujobax.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/30ed20edec5fb4676add2c1a281295e3/muzeroguwivesoxarugaduk.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1cb39ea9e---jipesewaw.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/78fb727c227c1cc5b381ce2244a003be/40330481397.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160706cc454406---24816888511.pdfIn PDF document text
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/30539480986.pdfIn PDF document text
    • http://arisutour.com/ckupload/files/gibigavazowezemubidutise.pdfIn PDF document text
    • https://majubesar.com/contents//files/25431878703.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=single+room+occupancy+meaningPDF 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_off000190ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x190AC 10740 bytes
SHA-256: ae756bfe5b01599816bafb892fb4d539756ddc66f3e574ad6c1960ac962f85af
font_01_sfnt_off0001a958.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A958 23196 bytes
SHA-256: 44e61adb7aa55a4ae9bc934b2fce05f646bdf8a9e75cec879d997fba2efb1f2c
font_02_sfnt_off0001e3bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E3BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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