Malicious PDF — malware analysis report

Static analysis result for SHA-256 34657545dcf4f778…

MALICIOUS

PDF

83.8 KB Created: 2021-09-03 07:47:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8dadfdf8f8dd4d66c7acb424d3bbc0d1 SHA-1: 49139e398782fc874a8c0cce4a12a5ec6ea1c8ae SHA-256: 34657545dcf4f7787a5b14e710ceb115009c240637b6cff5a6fd5de494182ea7
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights the use of disposable hosting and UTM parameters, common in phishing and malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://drafthe.ru/uplcv?utm_term=melag+autoclave+user+manual PDF link annotation
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/54e6e9cb9a43b8c84d2eadd8a544e71c/65520028306.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160765430c108c---93692350388.pdfIn PDF document text
    • https://kfmaccounting.com/webroot/img/content/files/91088897064.pdfIn PDF document text
    • http://baaningdoi.com/file_media/file_image/file/kivevukiwinid.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607940ea80bd5---51710762333.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/2fcebe90632b83ca3512fbd2b32b44d2/revonixupanetaguk.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607c313387f0f---fadojupusitasudaxarobu.pdfIn PDF document text
    • http://penzionnakrizankach.cz/ckfinder/userfiles/files/kezisagomot.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0a5db1f5a---tofulolop.pdfIn PDF document text
    • https://estudiowebcolombia.com/ckfinder/userfiles/files/bobuzubibadutadegu.pdfIn PDF document text
    • http://gutachterbewertung.de/userfiles/file/94185859640.pdfIn PDF document text
    • http://nutranghongngoc.com/media/ftp/file/21785768864.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b56097c2f1c---geneliwuval.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/4e3e3f29b28c489585c5bb799f5fc5cc/27403527873.pdfIn PDF document text
    • http://lmyc.net/clients/875386/File/niromijexarawomexevadufo.pdfIn PDF document text
    • http://wjcopy.com/upload/files/1192053279.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/tufuvoketetu.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/28594284332.pdfIn PDF document text
    • http://twothirdsmajority.us/clients/38522/File/ragirigemoziborusew.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/jufaxetanofifoja.pdfIn PDF document text
    • http://explosivedevices.ru/media/file/wiwopuliruwaledipemawokij.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/161ad5a8f51d39b8ed7c0f5eb60bc01c/40349250367.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_off0000e2da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2DA 10640 bytes
SHA-256: a34b47c8efbe4845c34449cc85f62f9760f6264f008c3753c6d39be28f1ab846
font_01_sfnt_off0000fb49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB49 17888 bytes
SHA-256: ba82b80ffb38305097c60093001cdedbfdbb58fa0e8de2a99fad77ed0a631a4f
font_02_sfnt_off000129fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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