Malicious PDF — malware analysis report

Static analysis result for SHA-256 1794aaea4f514eb9…

MALICIOUS

PDF

82.9 KB Created: 2021-09-13 14:34:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3cde4d9819be6de6a6ff24f47e40860f SHA-1: fc52d2b6d80f425665007f2a8619d575ebd7d703 SHA-256: 1794aaea4f514eb9754c0821d1756d5f4f50c9dabb7ae1df8658d629e33452df
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised or disposable domains, indicating a link farm designed to redirect users. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest a phishing or malware distribution scheme. The ML classifier and ClamAV detection further support its malicious nature, likely serving as a lure to download further payloads or phish credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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://coretry.ru/uplcv?utm_term=android+emulator+for+visual+studio+2013 PDF link annotation
    • http://ystechpro.com/nbloom/fckuploads/file/34915352494.pdfIn PDF document text
    • https://dp-silver.com/userfiles/file/23246033018.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/63224466699.pdfIn PDF document text
    • https://harteron.ee/userfiles/file/24584718382.pdfIn PDF document text
    • https://vhcvietnam.vn/ckeditor/images/files/kakadereg.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/37993693772.pdfIn PDF document text
    • https://dichvuketoansg.com/luutru/files/36685365155.pdfIn PDF document text
    • https://morethancars.eu/uploads/edytor/file/61039110598.pdfIn PDF document text
    • http://jullien38.com/ressource/site-image/files/wotupotawisabebizagutus.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613ddd5d5098e---49526414280.pdfIn PDF document text
    • https://ladida.asia/sporlegen/administrator/imagetempfile/63107039171.pdfIn PDF document text
    • https://olivermilk.vn/tctt/sites/aaa/file/147351980.pdfIn PDF document text
    • http://jingluo.net/uploadfiles/files/98812933920.pdfIn PDF document text
    • http://wcsps.com.tw/ckfinder/userfiles/files/gokawo.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/9927f22a14f4431d23b58673c0f1c034/xawadavawabilopuziseleb.pdfIn PDF document text
    • http://balogmihaly.hu/UserFiles/file/kiliwoz.pdfIn PDF document text
    • https://csam-villepinte.org/uploads/images/file/gamanikexizawa.pdfIn PDF document text
    • https://tp-pos.com/uploads/image/files/35594406752.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/00804bd25b177e8327a7d950f24db6b9/tilemibutefu.pdfIn PDF document text
    • http://www.farmaciavictoriayjmleon.com/userfiles/files/komosamawobelepabisilu.pdfIn PDF document text
    • https://galaxy-training.com/userfiles/file/7872408249.pdfIn PDF document text
    • http://thienlongadv.com/upload/files/zoxibogosow.pdfIn PDF document text
    • https://agrando.cz/files/file/51358767244.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b5ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5EE 20684 bytes
SHA-256: d675127478f4a63c3c82429272c36d969dcbcf214072264919e816e9f82b7d2e
font_01_sfnt_off0000e9e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E9 11128 bytes
SHA-256: 10317cb9ac780cd92e38d626b2b07e0fd6bce2ad6a90e472b0b5a1864e1b4bf8
font_02_sfnt_off0001040a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1040A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00011c1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C1B 16380 bytes
SHA-256: 6154b12a9e2cc94f816cb8653bf1943d22d5e3e4ef8c393a99ab04774184dae0
font_04_sfnt_off00013297.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13297 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc

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