Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a70750a8a005204…

MALICIOUS

PDF

97.5 KB Created: 2021-07-20 11:52:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 27436a088b8ddd2867737b0325dec9a2 SHA-1: 90e036adca63ded79503a7014bc23aa3d93c68df SHA-256: 2a70750a8a00520459bb6d0408d792aa5fe5778386a2028eb40adc369da2d35d
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to compromised WordPress sites or disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to SEO manipulation or directing users to malicious content. No scripts were extracted, and the document body was unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://terralis.eu/catalogue_dynamique/file/ninepudepumilezibez.pdf In PDF document text
    • https://trungtammatnamviet.vn/upload/files/39374335513.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c6e02d44f09---guzir.pdfIn PDF document text
    • https://laserbeautymachine.net/d/files/68384774393.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/ml59tcqbgq117pev73351a2eh1/8925195149.pdfIn PDF document text
    • https://digidatadecolombia.com/wp-content/plugins/super-forms/uploads/php/files/c4ae9fca16033a81dc9fcdf5be1875a5/xijemopile.pdfIn PDF document text
    • http://fkhd.cz/data/img/nilijopabupotaredunolewe.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/a89984faf40640c521513d7ce5feca92/31301228514.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/22738ad98e9087bd42995cbcc1b0ad4f/jasipofekepabosedexi.pdfIn PDF document text
    • https://tpk-m.ru/files/file/pupirubalimodik.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/c5b602c61b23855efe8abcd5e52c23eb/96014680036.pdfIn PDF document text
    • http://wtmongolia.com/materials/file/91046483170.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac42259ada3---najedejaziferavigebosomof.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/e4nh7uqruk4fbqm97gra8tqr8g/xonojoketepowurigigeg.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ca06f5a243f---41521022946.pdfIn PDF document text
    • https://diaochue.vn/userfiles/file/17108360699.pdfIn PDF document text
    • http://tradeweb.es/userfiles/file/89662481534.pdfIn PDF document text
    • http://onishi-kyosendo.jp/archive/juwilek.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16084836d2aa9d---51798172253.pdfIn PDF document text
    • http://groupkaishan.com/d/files/silekifaw.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609e3ac9bb592---37734112757.pdfIn PDF document text
    • https://www.analfissur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160814acd38669---jukuxunemusodujozetivirir.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9fb7b245b---jelefaxujoxepim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=list+of+animals+and+their+young+onesPDF 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_off00011c44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C44 16748 bytes
SHA-256: cf606a28a3baf6fe77b83251d49325cad95e9f6406c9b77328ff14dca86f75b7
font_01_sfnt_off000147b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015fcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FCF 10972 bytes
SHA-256: 7f961754ca62b340ad2cf58036dfa35b6e499b5346ff5c7ce0fc7b32c07cafe9

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