Malicious PDF — malware analysis report

Static analysis result for SHA-256 565bb51f868d1fd0…

MALICIOUS

PDF

82.3 KB Created: 2021-09-16 23:27:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e922f4d85b2d7aeb3a0628c800e8ae3b SHA-1: f7c681896bdaa6936b9103cf4eda03bb8e97707c SHA-256: 565bb51f868d1fd0cc8f8805ce1d786ee2fab20292119922461b328ea4c0a2c9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ClamAV as a phishing trojan. It contains numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, suggesting an attempt to manipulate search engine results or distribute malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://crewmak.ru/uplcv?utm_term=android+software+for+pc+windows+7 PDF link annotation
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/6decda64c762447ba376d1803778c1ad/34933380636.pdfIn PDF document text
    • http://platcometals.com/images/file/98788215503.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/743bc4e0ae88a3e52bfad0abff900c88/soxuzerusulu.pdfIn PDF document text
    • http://www.hydro-tg.pro/upload/file/gajidifaxabibesonibedok.pdfIn PDF document text
    • https://imihwa.com/uploads/image/20210901/files/20210901093241.pdfIn PDF document text
    • http://beerskiboot.de/img/upload/file/zuvav.pdfIn PDF document text
    • http://chapaconoticias.com/assets/ckfinder/core/connector/php/uploads/files/noroxam.pdfIn PDF document text
    • https://viessmannboilers.ca/fck_upload/file/42430183348.pdfIn PDF document text
    • https://mimpishio2.com/contents/files/63156484814.pdfIn PDF document text
    • https://sportuna.be/ckfinder/userfiles/files/88816931760.pdfIn PDF document text
    • http://spielundlicht.de/content_provider/documents/files/26949859218.pdfIn PDF document text
    • https://allcondosales.rodeodrivecondosale.com/userfiles/files/38274907458.pdfIn PDF document text
    • https://friendsofmultisport.com/ckfinder/userfiles/files/saxojerugope.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613538c1be99d---zifufakaterexupadir.pdfIn PDF document text
    • https://cuatudongnhatrang.com/uploads/files/99317457927.pdfIn PDF document text
    • https://emotionalgift.youngzonejewelry.com/ckfinder/userfiles/files/jerijuxadixukudigusu.pdfIn PDF document text
    • http://ufcnagykanizsa.hu/userfiles/file/46589108524.pdfIn PDF document text
    • https://jin-ji.com/upload/files/tipokojevedavutulofipezi.pdfIn PDF document text
    • https://silverbirdmarketing.com/pages/images/file/luvugagesawamipub.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/cead8bb1bde80121977a1961cf322252/43034337768.pdfIn PDF document text
    • http://logtech.cz/foto/Image/file/29776058623.pdfIn PDF document text
    • https://energooptima.hu/upload/File/67005741145.pdfIn PDF document text
    • http://lateonsettay-sachs.org/userfiles/file/jegamipun.pdfIn PDF document text
    • https://mediaget.com/userfiles/files/94900763047.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_off0000dd20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f537.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF537 10684 bytes
SHA-256: fdb70f1f0ddd843ce5ed2ba0d302e226a014aab9ceb11d0e6f5c03105b2e8c02
font_02_sfnt_off00010df8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF8 17836 bytes
SHA-256: a938c37042bfe3c5c217bf78b8a91eaa4f0db3b697ff027d1e7e07799b232145

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