Malicious PDF — malware analysis report

Static analysis result for SHA-256 e82629bee42a9b6d…

MALICIOUS

PDF

68.7 KB Created: 2021-09-21 21:01:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4d3ddae08768e91ee7b07f9623279698 SHA-1: 101d8e348c13e03d30908b7af8868ec7c9e0401f SHA-256: e82629bee42a9b6d077b9775beda441a50eea24f7a2fd6cbb7c256213cc5fd00
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the nature of the heuristics strongly indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://inwebjor.ru/uplcv?utm_term=nexus+7+2011 PDF link annotation
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1613d3c7b6ed6d---55504252914.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/5v5pptetb36oma6jauur2cnvjt/721608369.pdfIn PDF document text
    • http://dailymaydemtien.com/userfiles/files/kisadesalovudola.pdfIn PDF document text
    • http://tscyw.net/userfiles/file/20210918010605_514fv9.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16144afa4e0ba7---59387349043.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613ebcb5da9be---fosotarikenu.pdfIn PDF document text
    • https://ozsersogutma.com/upload/files/41946796423.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/63106739985.pdfIn PDF document text
    • http://thebrownbag.vn/upload/files/67695491076.pdfIn PDF document text
    • http://sportsclinicwest.ie/media/contents/file/47714152195.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/a466f1ff18c981f323d6c07e881e6b5f/wobifapavusuxudokudifafu.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16135d501e1161---48738019718.pdfIn PDF document text
    • https://adikkedua.com/contents/files/ganikikemebexexe.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/gisinazizefuruganus.pdfIn PDF document text
    • http://greenbelt.abwingsmd.com/uploads/files/73764369254.pdfIn PDF document text
    • https://portoggitter.no/content/files/userfiles/file///8892375840.pdfIn PDF document text
    • http://technology-mp.it/userfiles/files/poporofolujad.pdfIn PDF document text
    • http://sanchariglobal.com/userfiles/file/22412017581.pdfIn PDF document text
    • https://thietbivesinhsonhoa.com/webroot/img/files/33062488410.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613882df98b9f---90927460182.pdfIn PDF document text
    • http://xn--80aadcnaeutgftohcogh8i8dsc.xn--p1ai/pict/file/71133997974.pdfIn PDF document text
    • http://kamerton.nl/clientfiles/tibafis.pdfIn PDF document text
    • https://foodphotoshop.com/userfiles/files/10872825291.pdfIn PDF document text
    • http://szintai.hu/ckfinder/userfiles/files/71152109666.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_off0000b059.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB059 9900 bytes
SHA-256: 97227c40ee63ccd03d6b8c19b1f41c624931e242f742033a3d08e823fccebec4
font_01_sfnt_off0000c67f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC67F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000de91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE91 14976 bytes
SHA-256: 3000db149f8eaba5971633f49b8f2f8b7704c2701a9719067afedfafd3e16010

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