Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b012d577a1733e0…

MALICIOUS

PDF

88.3 KB Created: 2021-07-03 12:42:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 8cb63419a4bfb093076e627bf8507242 SHA-1: b177438ba71a4f714cc08a76bc52e910048558d6 SHA-256: 0b012d577a1733e06b4e7a822f8e39fb77b61f188bc315274e0bac8e5d0bc82e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe180babf6---25123080106.pdf In PDF document text
    • http://tasteofruraleurope.eu/upload/File/21061117928.pdfIn PDF document text
    • http://karpatskiles.ru/store/file/kewipulumenagi.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/bd4f021242fae146d43e043b61b34b0f/govirugisokute.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0a34daa3b---kajifoto.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/34741422041.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160dcdc98a57f8---wifilalonubejab.pdfIn PDF document text
    • http://eksan-ltd.com/userfiles/file/rizobazakinelufivasudoz.pdfIn PDF document text
    • http://kath-kiga-bw.de/bilder/berichte/file/lefonasemebijobesukuvawiv.pdfIn PDF document text
    • https://almuhja.ps/ckfinder/userfiles/files/linoririnujosena.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a5e36d0609e---fafewexunox.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a3ce8a55327---13308921290.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/4341931067.pdfIn PDF document text
    • http://truthtube.com/UserFiles/file/60180982263.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/xubiriwejijoxuvirafu.pdfIn PDF document text
    • http://konyaozgunmobilya.com/userfiles/file/ludowatavawo.pdfIn PDF document text
    • http://styropapex.pl/userfiles/file/jefusulojinuzumonep.pdfIn PDF document text
    • https://lasanisports.com/files/podopimasaveso.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d7f87fe8238---donotarazamobigimametaju.pdfIn PDF document text
    • http://graphicyazd.com/ckfinder/userfiles/files/73578868407.pdfIn PDF document text
    • https://davaocarrental.com/images/file/diziloza.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6c3679a82---jamuwobavirasimiwisusire.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea51ee9607---90217074961.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=continuous+blinking+of+left+eyePDF 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_off0000f6f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F5 17268 bytes
SHA-256: 4f4547418635f6b077ca6e088e6a96d9fbbcb5cf3d4e817e1eb127cd55dd6d78
font_01_sfnt_off00012386.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12386 10604 bytes
SHA-256: c9fd4a9c814a75646492bc189920d1f816447bb25fb0cad0cf9980e25ad87266
font_02_sfnt_off00013c01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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