Malicious PDF — malware analysis report

Static analysis result for SHA-256 7598ac617b4243ff…

MALICIOUS

PDF

82.2 KB Created: 2021-09-05 02:49:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 24b80bf051d6b760527b8ab944ae6f42 SHA-1: 4887b35a702a6713afb4e6099fc5268269a87716 SHA-256: 7598ac617b4243ff7eb02096894bc94172eef5a76e67d830360771a0e1507f59
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The file's structure and URL patterns are consistent with SEO poisoning or phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://queure.ru/uplcv?utm_term=kia+sportage+2017+owners+manual PDF link annotation
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/d87c3117ebfee25bbc6a3d4088ef5363/toxinadun.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1609bacda7a8fd---reratenowiperuwafiwidomop.pdfIn PDF document text
    • http://worldwidefilipinoalliance.com/uploadedFiles/files/xugexuwubaduxadivuf.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f3d10ebcd56---96134956486.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/46b5934e1192236547039783e04a96ae/21029271612.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/m3iem27v7h05sl0n79u7i417j2/41908864989.pdfIn PDF document text
    • http://klefmarken.se/upload/file/jetefope.pdfIn PDF document text
    • https://mama-light.net/business_school/uploads/file/73628414739.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160856ef106dd6---taxefidozatuvo.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/ppuv9a2m8i2vcmlb9qf9ckg3mv/20709331119.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/783aa491f4310fd4f762f1daef37ed57/nijexiw.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/082f8cf8e2534db067bbbde83fe91659/zinasiwesogidixusoditimo.pdfIn PDF document text
    • https://polandpools.com/contents//files/nageferadovawosudobajateb.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1609954bc06085---31313528520.pdfIn PDF document text
    • http://islandpointfl.com/userimages/80531133548.pdfIn PDF document text
    • https://igk-lilienthal.de/downloads/44814340487.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3f794ec7d1---gekobenobekol.pdfIn PDF document text
    • https://stgeorgedentalcare.in/ckfinder/userfiles/files/8828898668.pdfIn PDF document text
    • http://machinegroup.ru/img/outer/files/3251008994.pdfIn PDF document text
    • http://annandale1963.com/clients/69704/File/pavokaderamavururik.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/e0f695cb51860561300d744273b9bf08/22224686746.pdfIn PDF document text
    • https://leciv.fr/uploads/FCK_files/file/49701732314.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_off0000dacb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDACB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E2 11116 bytes
SHA-256: 4fd2d27de4117906416cfc0ca6080163e045a59b9e8207cffda926f8172c9de8
font_02_sfnt_off00010d02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D02 17816 bytes
SHA-256: 6b1510946bd98f431c11796ab2f669b9f2ceaaca82312d6047ccc894435ee7e6

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