Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f1405f87d48d304…

MALICIOUS

PDF

82.7 KB Created: 2021-09-16 10:37:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f8d0aba5d5222e1120f290a2ff58e698 SHA-1: fc62298bfe1271fb6981ee571cbabafcb94fadf9 SHA-256: 5f1405f87d48d304fb2bd9d8ed07baf700635a896353b9812238c651842891e3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://synerhu.ru/uplcv?utm_term=world+noob+game+free+fire PDF link annotation
    • http://sasolution.kr/userfiles/file/tokatuvevuwopabakomor.pdfIn PDF document text
    • https://fong-cai.com/upload/files/33199363659.pdfIn PDF document text
    • http://uticachemical.com/files/upload/files/36548405922.pdfIn PDF document text
    • http://denda.co.kr/ckfinder/userfiles/files/gozowo.pdfIn PDF document text
    • https://implantologie-deva.ro/app/webroot/files/userfiles/files/fokefugaze.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/binukakusegipojeligiv.pdfIn PDF document text
    • http://hobbes-group.com/upload/files/55246233185.pdfIn PDF document text
    • http://newcityhk.com/userfiles/bavobolike.pdfIn PDF document text
    • http://veewood.com/file_media/file_image/file/65173608518.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021090616452841.pdfIn PDF document text
    • https://amzentransportationindustries.com/admin/imagetemp1/file/dimedituna.pdfIn PDF document text
    • https://derya.afmiletisimajansi.info/resimler/files/11143663041.pdfIn PDF document text
    • http://qataminational.com/uploaded_files/userfiles/files/14385683901.pdfIn PDF document text
    • http://derp74.fooden.com/UserFiles/files/lexejufibasaritivofipe.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613ecafa51756---80785168355.pdfIn PDF document text
    • https://dolphinsolutions.net/ckfinder/userfiles/files/sifuzinagalisafuvo.pdfIn PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/mafeluki.pdfIn PDF document text
    • https://retrofitoman.com/ckfinder/userfiles/files/91436997934.pdfIn PDF document text
    • https://eol.org.pe/ckfinder/userfiles/files/36252395410.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614187efa12ca---77638265443.pdfIn PDF document text
    • http://investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/nunezodevirizazagi.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613fbfa7bde3f---pokitejapadikepewedi.pdfIn PDF document text
    • https://worldmedglobal.com/userfiles/files/zomoboxexenefurid.pdfIn PDF document text
    • http://thegioimercedes.com/upload/files/17230301620.pdfIn PDF document text
    • http://jca-t.com/fck_image/file/61470883767.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_off0000dfee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f805.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF805 10564 bytes
SHA-256: ebaba09d667c7c7910f2874445c1c9d1aa68624034204216293c4af24791aaa2
font_02_sfnt_off00010fc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC9 17592 bytes
SHA-256: ecb3dd30d12877fcb62d3e473bebf3018fc9c20fcccc3e698b8dbc9a0c7b3775

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