Malicious PDF — malware analysis report

Static analysis result for SHA-256 d11c45c9370b813f…

MALICIOUS

PDF

99.1 KB Created: 2021-07-30 20:26:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e701725deb2d2f0beec6d7cd28d821f8 SHA-1: fce429494f7c67062ffcb2c464674c56ea3bc2aa SHA-256: d11c45c9370b813f0848c057edbd919184f5a5ebeda9c919e5fd365dd7a2ad06
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to various domains, some of which appear to be compromised CMS uploads. The primary purpose seems to be directing users to external sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 https://pistant.ru/uplcv?utm_term=transformar+fraccion+a+decimal+calculadora PDF link annotation
    • https://marathonroller.com/userfiles/files/supolofijejofusudiboj.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/wovamozuwiginasid.pdfIn PDF document text
    • http://autohondl.cz/userfiles/file/wumopakuka.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/90ffd5b162034eaeac08cdeb7f1ed425/guzavobatudulutoruba.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/26022303587.pdfIn PDF document text
    • http://sheeld.org/clients/d/d0/d021426cee8527c21a172be12ef3d645/File/62332193570.pdfIn PDF document text
    • https://farmstead.tw/farmstead/upload/files/rawimebamugopuxabunamax.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a05dec775e4---34973580288.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099eb2b63e7a---27420953064.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160884010ea165---4692306835.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/75065899617.pdfIn PDF document text
    • http://darec.sk/files/files/nasurov.pdfIn PDF document text
    • https://stayatrosetta.com/wp-content/plugins/super-forms/uploads/php/files/dpt4r0mtltqrbrnjmmcpvq086g/vepimatibewokawola.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/92544592034.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/6168961888.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/e447c053089cafc1df8398fbb1eaea87/jisanimuvox.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/51727103128.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/files/sakinuwobofugakelemijanu.pdfIn PDF document text
    • http://firanywiktoria.pl/uploads/editor/file/82683367320.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/644ffd8be3996227fb3c9c82a5bd0bf4/28938460526.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/jl3abmds2lscl1p1nf8q7v2656/rasetoweduzuzevenibatenaz.pdfIn PDF document text
    • http://stalmost.pl/userfiles/file/vomudifafimovorejina.pdfIn PDF document text
    • http://parentini.it/userfiles/files/1494595647.pdfIn PDF document text
    • http://industrialdevices.in/uploads/86282997754.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_off00011d3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D3A 18340 bytes
SHA-256: 979c80251e37cea6e8aa40d1b805df137922457aa666ca982398500c38f0b45f
font_01_sfnt_off00014c39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016450.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16450 10604 bytes
SHA-256: 91dbb3f1cd2fcf046dc9801f2fbe3de69a9b0fee780ee56d0ccd897dbbff4792

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