Malicious PDF — malware analysis report

Static analysis result for SHA-256 857bcc7d061d388f…

MALICIOUS

PDF

82.3 KB Created: 2021-09-06 19:02:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: c717b9ec979313ffc6a8e208b2587939 SHA-1: 9d28362ae003e25ce44e9bab1b70d53df6187f32 SHA-256: 857bcc7d061d388fe631c729e9cff44e43ac984bf9a8998dccbf3ef337723220
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 used for redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious PDFs designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e5bd65a1896---73966605455.pdf In PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609da104bc521---bizulejilajiged.pdfIn PDF document text
    • http://fsgpj.com/upfolder/e/files/20210717085054.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fccfc14ab87---46847248631.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/9567820111.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/gi992d47kut59te1q44s1523nj/75431580661.pdfIn PDF document text
    • http://acril.ru/ufiles/files/wigisepapunenugeta.pdfIn PDF document text
    • https://drsubhashawale.com/ckfinder/userfiles/files/44065632291.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075804638104---41697875235.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/81249725079.pdfIn PDF document text
    • https://carsen.sk/editor_uploads/system/files/74558256405.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/14570419854.pdfIn PDF document text
    • https://equantumconsulting.com/files/files/57787471987.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160745a8b55919---67266791737.pdfIn PDF document text
    • http://high-keenltd.com/userfiles/file/gipiwaposaxamivag.pdfIn PDF document text
    • http://palakkadtourism.in/ckfinder/userfiles/files/80670246715.pdfIn PDF document text
    • https://eingangrad.ch/userfiles/files/vowimab.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eb7013dfb5---nojewuxarolu.pdfIn PDF document text
    • http://esistore.de/userfiles/file/45863070953.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/lowur.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/23153658344.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/11631848558.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=carbohydrate+metabolism+questions+and+answers+pdfPDF 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_off0000dc0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC0A 17592 bytes
SHA-256: 0bf5132bf23dea46b2afebd33100d59a461feaedf211616b476d419093d37440
font_01_sfnt_off00010938.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10938 11380 bytes
SHA-256: 84f3fa7f5327a0a4f549a633c7405759a5cc93955b7ca675918be630138f5dc3
font_02_sfnt_off00012380.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12380 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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