Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a37aa7856d58ef9…

MALICIOUS

PDF

92.9 KB Created: 2021-08-05 18:48:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bac743fad6c04721ac9bd422ca4902d1 SHA-1: b2c071dfb68e2b8bdda64c2d6b98a9bf127fac72 SHA-256: 9a37aa7856d58ef9ead5d95871f3dedaa981bdfdd7db83481031bd0a74052e4d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with attempts to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://oniceh.ru/uplcv?utm_term=rodrigo+amarante+tuyo+narcos+mp3 PDF link annotation
    • http://mhs69indians.com/clients/864804/File/monajafixibigozalozokax.pdfIn PDF document text
    • http://blackshirts1960.com/clients/876325/File/24694225675.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/atsgqr6daa9js32t2vrja0n88a/57771111117.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609208dda5c36---namofufokug.pdfIn PDF document text
    • http://fenotropil.ru/userfiles/file/vegalufavosotup.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/13158c506f21095a9a0ab2d8d5bb43ba/95811144537.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c86157e7d0---gezedexexobizanad.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/842n2p2m8dbe2q10kchud2b901/zimurafaf.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/5d552bddb28eb8188364fc12ef4b692e/dikuxuxuxaz.pdfIn PDF document text
    • https://12tiga.com/contents//files/40639430228.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085f2ef538e0---fafiremeziwufopenojeda.pdfIn PDF document text
    • https://www.willmarshelter.com/ckfinder/userfiles/files/nebesera.pdfIn PDF document text
    • https://genimmigration.com/viking1/uploads/files/wumagabimiwikejovom.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606eabbe29a92---dobudasiguza.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160cc7a79f01f7---63324365215.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/dc2c4e78dda394698665a6f898828bdc/gurininisijipifufal.pdfIn PDF document text
    • http://rmgoals.com/userfiles/files/79044914676.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609eaad1c2cc2---zovegajosomijalifixad.pdfIn PDF document text
    • https://dodatnagarancija.com/userfiles/file/bidir.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/qi8nlsjvarbfpcbjbt00cdrt2p/16176694655.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/e4a51d8b6844128661b42e739385e9fe/nuruzupepuraxeda.pdfIn PDF document text
    • http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tumepijur.pdfIn PDF document text
    • http://pnktools-th.org/ckfinder/userfiles/files/rotuzukamarog.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160879106a82ee---bomigoziwe.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF9D 16572 bytes
SHA-256: 957022124c045bb123137aed1e2349d0f19e46d285cc608d72f91248e7b84f99
font_01_sfnt_off0000f6b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B3 11240 bytes
SHA-256: bffba83e20b650e744154a20e6e5df0428b7d0861b9ea7799ee07209d84d3b81
font_02_sfnt_off000110e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110E6 23052 bytes
SHA-256: 132c752424073bdeac1d7e0fc9b5534573c323573d059f9eabcea35643dac6ab
font_03_sfnt_off00014a6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1