Malicious PDF — malware analysis report

Static analysis result for SHA-256 d995a1a08ebad6bf…

MALICIOUS

PDF

82.1 KB Created: 2021-06-27 01:55:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4ac1b66046dd4dc47aae22990b79978b SHA-1: eb4d502ac60b8d9ddd15b10dbd62b3a9a62c5603 SHA-256: d995a1a08ebad6bff60f7c2c4540f65cf8c05bf0ecebdbceaf340066803431f9
156 Risk Score

Malware Insights

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

The PDF 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 link farm structure, and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests malicious intent. The primary function appears to be directing users to external, potentially malicious, content.

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 https://crysiq.ru/uplcv?utm_term=1942+a+love+story+full+movie+filmywap
    • http://dangkykinhdoanhkiengiang.com/upload/ck/files/lezababi.pdf
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/16094acfc93450---57524004712.pdf
    • https://areicon.com/images/file/jevipopewi.pdf
    • http://llux.vn/uploads/files/zemuderunamububeroxovufo.pdf
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070fa74c8843---67071002634.pdf
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/lhldjch2es9lri39juprn4deff/53958525119.pdf
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/cfa6cfa20f5dcd2a637193b5e6ac1318/tuwuzigejanonotefebolonad.pdf
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072813874cc9---popumomatovimoxeb.pdf
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/o9dvtdk0aeu5ds16e38njshegc/mojiguremabuvivavede.pdf
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160773e0b96b32---63471638486.pdf
    • http://sushigonewildtogo.com/uploads/files/lepeb.pdf
    • https://gastrotest.co/ckfinder/userfiles/files/22002239002.pdf
    • http://wtmongolia.com/materials/file/rovisowekekogadijifabaxoz.pdf
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/u4meckb3rcpfim0ect2fvopriq/78666306275.pdf
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/ead6500cb088731b4172526a16c31667/90871284434.pdf
    • http://aldo-ins.com/userfiles/file/38007280145.pdf
    • https://blsautomation.com/ckfinder/userfiles/files/dozexezilon.pdf
    • http://cesishotel.lv/res/wysiwyg/file/73077120053.pdf
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072f02578609---25545720098.pdf
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/f8d1d57e83a2002455552f4b27f45ddf/34297570848.pdf
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/ashclmsefo4hfnihgduoucknfv/rufuliwumuruvitom.pdf
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a962740b0b2---98806666477.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d77f.bin
82c15b25f689c429d54051c5ddc679e99dfd03ba1dfde78fbb700c296e5994ab
pdf-font-stream PDF embedded font (sfnt) at offset 0xD77F 18152 bytes
font_01_sfnt_off00010776.bin
13abc6199a1f2d23872887b41acb5c3c044de9f088ec09fc2a14f17f0efa4572
pdf-font-stream PDF embedded font (sfnt) at offset 0x10776 11100 bytes
font_02_sfnt_off000121ac.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x121AC 16792 bytes