Malicious PDF — malware analysis report

Static analysis result for SHA-256 10774cc4f4352d0f…

MALICIOUS

PDF

130.8 KB Created: 2021-08-14 15:44:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4540d0aa2912cef4d997452ee0994be2 SHA-1: 9af98355ed84cc0d48d320f3afc0763595d32f9b SHA-256: 10774cc4f4352d0f14f8dc82effe12dde032f89382edddeffb6e85ab65067751
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains a link farm pointing to multiple domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of numerous links on potentially untrusted domains suggests an attempt to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://sushrutproctology.org/ckfinder/userfiles/files/jefimoxurosi.pdf
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161095d20f401a---93467813898.pdf
    • http://watthaistuttgart.de/userfiles/file/disilakos.pdf
    • http://abwingsjanaf.com/uploads/files/16919662933.pdf
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/162b17186c88eea38c0bc69ada9ee0b1/pewitagafabegosuvagajizaf.pdf
    • http://okeefesreef.com/ckfinder/userfiles/files/xifarovagu.pdf
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160952871c3d91---61567065032.pdf
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/161126c75457c6---92495664273.pdf
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16080d32b68fad---revad.pdf
    • http://metamorfoza-krosno.pl/userfiles/file/puxetuzela.pdf
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/emkibne2u2t5uqolulai6li7i3/kiwovutitego.pdf
    • http://happypalettebnb.com/CKEdit/upload/files/litanufiz.pdf
    • http://perfekttorun.pl/pliki/sexibiramarotabap.pdf
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160792776ae344---50898628316.pdf
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a22db7a268e---batilubalidosidusos.pdf
    • http://1mosref.ru/ckfinder/userfiles/files/88621804926.pdf
    • http://bielle-srl.com/userfiles/files/disevivitawibiwumalivuk.pdf
    • http://palyavalaszto.hu/teszt/upload/file/47856594935.pdf
    • https://podiummagazinenews.com/ckfinder/userfiles/files/44818788234.pdf
    • http://kapelski.pl/userfiles/file/degosesexuwule.pdf
    • http://svsteinfurth.de/radsportfiles/file/joxajekoliz.pdf
    • http://safarang.com/basefile/files/36534486321.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=t%C3%BCrk%C3%A7e+paragraf+sorular%C4%B1+%C3%A7%C3%B6zme+teknikleri+video
    • 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_off00019713.bin
ed04d3561a52a7438f8828d4c4b895230743f20303019afd03cc5b3982932fa3
pdf-font-stream PDF embedded font (sfnt) at offset 0x19713 11772 bytes
font_01_sfnt_off0001b22e.bin
42f8808caebfb553b65aeda69feb8a1f1e1e5f3113fcfcefa1af0049836dc95c
pdf-font-stream PDF embedded font (sfnt) at offset 0x1B22E 19612 bytes
font_02_sfnt_off0001e1d6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1E1D6 16792 bytes