Malicious PDF — malware analysis report

Static analysis result for SHA-256 19d235c6a8a2de1a…

MALICIOUS

PDF

77.9 KB Created: 2021-09-08 04:36:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c91be33774cc62b748ff3baf3e9e65d4 SHA-1: 47ab04699a20175b981f342a39ab0db7635096b0 SHA-256: 19d235c6a8a2de1ab010a490fdf5a2717ae0ec38ad4947ccc9a6ee671c51d2e3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://queure.ru/uplcv?utm_term=midday+news+paper+today+mumbai+pdf PDF link annotation
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6f263ac014---netaxisagibewinasip.pdfIn PDF document text
    • http://lamarchesainterita.be/lamarchesainterita/imgdb/news/files/jimuzoxinekufibenatok.pdfIn PDF document text
    • http://clinicaveterinariamontecchia.com/userfiles/files/88734319719.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/5it72dl3anpr4nvmm6msspdkl7/84756689063.pdfIn PDF document text
    • https://grandiosieventinuziali.it/filesUploads/file/72976949166.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf539d232fd---fumuvinerudapezanenex.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/bban9t981thfnc06q202s53gik/82303699127.pdfIn PDF document text
    • http://leton.pl/userfiles/file/walupujekixedojupavozesup.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/635c802ec450aa3a91ad2fac7d7c76c5/xonuwineli.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/74493557730.pdfIn PDF document text
    • http://gursakaryahukuk.com/images/file/42193947021.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/me1iumh84a5ul9fg168qgeunl3/65255399365.pdfIn PDF document text
    • http://yangs-ns.com/ckfinder/userfiles/files/20210730091042.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ba986817295---4589540269.pdfIn PDF document text
    • http://bethtikvahevents.ca/clients/2/20/20a91c0cb94b02964b0d1c5d980f1596/File/8353448904.pdfIn PDF document text
    • https://ptogel2.com/contents//files/tinopebebuf.pdfIn PDF document text
    • http://hoangle.vn/uploads/userfiles/file/gagilizitekipifetugu.pdfIn PDF document text
    • https://pellevah.com/upload/files/77051119441.pdfIn PDF document text
    • https://ratco-hardware.com/Ups/files/64881129634.pdfIn PDF document text
    • http://weingut-suppan.at/files/24953812629.pdfIn PDF document text
    • https://kingcarmotorista.net/uploads/files/64544890753.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/b794f2528c6671fcb2d49a78258636af/gejijoluzapeb.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/6cf317c9cfdf4111452c9d81ef11980a/74301361223.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_off0000c212.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC212 11044 bytes
SHA-256: afc06c19baed4bd8532e83b5462b9da20d8f33edf0303cc7e5144bf80e4a4c17
font_01_sfnt_off0000dba0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA0 20880 bytes
SHA-256: a733a6abf21559244d2d86a75a112a3788a9360f07defce0d24d68cd9df74a40
font_02_sfnt_off000111c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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