Malicious PDF — malware analysis report

Static analysis result for SHA-256 676015fc8f2815c4…

MALICIOUS

PDF

71.3 KB Created: 2021-09-29 11:51:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9c46ed29ac967c92fd668014665c83aa SHA-1: 141618633fa8023d1f55d82550e53b3a2ec13bb4 SHA-256: 676015fc8f2815c493bbc072c53737e5890abe6b376978492310bb07f6f94d59
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the presence of a link farm pointing to multiple external URLs, some hosted on compromised CMS uploads. The primary goal appears to be directing users to potentially malicious or phishing sites.

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 http://studioagm.it/userfiles/files/lewisixu.pdf In PDF document text
    • http://biomehl.com/images/content/files/59760299942.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/161485fad909b3---9572519357.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/2g1ramiuc736vs8aac8osp60k1/lujexeja.pdfIn PDF document text
    • https://stgeorgedentalcare.in/ckfinder/userfiles/files/memafitalusux.pdfIn PDF document text
    • http://itaxabc.com/userfiles/file/20210926102001_1233171499.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/fopodojo.pdfIn PDF document text
    • http://rebornfair.com/FileData/ckfinder/files/20210901_2540800BA9E92B45.pdfIn PDF document text
    • https://firsatoyun.com/calisma2/files/uploads/91288548155.pdfIn PDF document text
    • https://taiwancy.com/app/webroot/userfiles/files/83444490131.pdfIn PDF document text
    • https://idealist.ro/userfiles/file/luwabuvunasa.pdfIn PDF document text
    • http://king-pro.com/userfiles/files/pezapesabewawoma.pdfIn PDF document text
    • http://jcon-aps.dk/userfiles/file/vefepake.pdfIn PDF document text
    • https://tungafilm.com/dorceiys/ckfinder/userfiles/files/lolatunibirozirojenon.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133abdf98cfc---jisajisij.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/9455638e81933af947e33acd96762629/50239123315.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/358455528.pdfIn PDF document text
    • https://khogiaydantuonghanquoc.com/images/news/file/8686860933.pdfIn PDF document text
    • http://olympicthesportshop.in/uploads/kiwanorotexulena.pdfIn PDF document text
    • http://ceramicaartisticamarsalese.it/userfiles/files/dugafadokab.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/89ad2ec3b556c12fbf80018bffc2ee7f/31880933406.pdfIn PDF document text
    • https://hotelindigha.com/FCKeditor/file/kowawe.pdfIn PDF document text
    • https://pingthye.com/userfiles/files/36946213453.pdfIn PDF document text
    • http://ryukatsu.com/userData/board/file/43916966461.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=what+to+eat+for+breakfast+before+the+gymPDF 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_off0000b337.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB337 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB4E 10760 bytes
SHA-256: a3a69399d661c5e9dfb72c4aa3a44df3578b040b031c7bc2260ec647d6ebec88
font_02_sfnt_off0000e428.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE428 17116 bytes
SHA-256: 4df60b3756034115e874316aeabf77ccebc26930a93124c48f2f814eea18b74c

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