Malicious PDF — malware analysis report

Static analysis result for SHA-256 779fd3f3f2807c20…

MALICIOUS

PDF

89.3 KB Created: 2021-09-13 15:51:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: fb0fdc862f1fe5286096a515924793dc SHA-1: 3441f3edca69a5038e447b868ae09b07ce0de034 SHA-256: 779fd3f3f2807c202b29ab6586a19b5fa2106599d3794dac8f9c359138ccb539
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and link farm nature strongly indicate an attempt to lure users to external resources, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://xn--q20b13r9leepaeb.net/upload/file/202109090249004920.pdf In PDF document text
    • https://cncunse.com/d/files/67806651765.pdfIn PDF document text
    • http://dichvugiayphep.biz/upload/ck/files/womazajatoliduxevun.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/16134e89a2a90b---9267879815.pdfIn PDF document text
    • https://maconlux.lu/userfiles/files/zitokiduwuj.pdfIn PDF document text
    • http://abbeytraining.net/userfiles/file/xitup.pdfIn PDF document text
    • https://ebooksweb.net/files/file/99093049906.pdfIn PDF document text
    • http://madiagranitosilano.it/userfiles/files/59254460829.pdfIn PDF document text
    • http://commune-bourre.com/userfiles/file/tugijuwekusopedujiv.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f724a86641---wedejejiruzozobovomib.pdfIn PDF document text
    • http://feynburg-uhren.de/uploads/molejotulemomigireji.pdfIn PDF document text
    • http://szyuangang.com/UserFiles/file///xadurolapiziju.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613db0de486ab---vedarofiwuvegupenolozi.pdfIn PDF document text
    • http://suliaok.com/v15/Upload/file/20219388138783.pdfIn PDF document text
    • http://hqshop24.com/userfiles/file/kiguwari.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/dupstiokgapcqi4n8vc388dean/17237131742.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/59befcc7e1f3a07ea6f62d87d1126340/jorenesejigofopulariso.pdfIn PDF document text
    • http://sipzip.com/userfiles/file/59843462133.pdfIn PDF document text
    • http://s-pack.kr/userfiles/file/20210909215746.pdfIn PDF document text
    • http://loscogliodifavignana.it/userfiles/files/rarifuru.pdfIn PDF document text
    • http://all-paca.com/ckeditor/ckfinder/core/connector/php/uploads/files/zubetarilujalumo.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/momewasoruguriza.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/pokamaleruwifonolu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=which+is+the+best+offline+game+in+the+world+2020PDF 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_off0000f4d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D6 18372 bytes
SHA-256: 0f714a1d7fb24b8bb74b22a9688fb6ce429aedd465a80bdd74d566b55f677acd
font_01_sfnt_off00012472.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12472 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013c89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C89 11384 bytes
SHA-256: 3fa0f33f261fd7d0d30f78a4e6b26124ed9d334358c0f57edde75683b9c97fdb

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