Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4d3d493a7f74789…

MALICIOUS

PDF

82.9 KB Created: 2021-09-04 23:08:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7559840d721fe3ace2af752c38d545f5 SHA-1: 657268836be283f07c715bf789c9c22bf40dcefe SHA-256: d4d3d493a7f747893357ebdd76a28e74bc9f69a36b4925c8f5145a1fbf5bf659
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to compromised websites and disposable domains, a common tactic for distributing phishing lures or malware. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a deliberate effort to create a link farm for SEO manipulation or to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://laborke.ru/uplcv?utm_term=english+newspapers+in+pdf+format+free+download PDF link annotation
    • https://tidymoney.com/ckfinder/userfiles/files/tevufe.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0917ab8ba---zasexukazob.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160f47bbe5dafe---29314003738.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/pazatavu.pdfIn PDF document text
    • http://anapro.com/ckfinder/userfiles/files/raxesezaropevisamajemu.pdfIn PDF document text
    • http://shinhwajudan.com/userData/board/file/78873801874.pdfIn PDF document text
    • https://areicon.com/images/file/74537948146.pdfIn PDF document text
    • https://sentinels.ro/userfiles/file/34831131815.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160722f66526e8---fiveleminogivume.pdfIn PDF document text
    • https://nutstudio.it/userfiles/file/zonimolone.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ec0febe0a---mapazelugukenorase.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1611654d27e87a---993034411.pdfIn PDF document text
    • http://gamaxmotor.cz/data/dokumenty/tiweze.pdfIn PDF document text
    • http://hurtglass.pl/upload/file/10990972087.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/lujasosenoj.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a4a295e2d9a---96862395257.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c168593f7b8---20183737313.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bda9bbeb3cf---zotebufanezikarufo.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16114cbea7f613---39663783518.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607298681cceb---12390774867.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/b4b451b93dada1addfad9aa07b0d32cb/31856715091.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/ba9aa2d6eae568e3b6947245c4f3647f/42578392545.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ab3cb0b68a6---18759710033.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/ndjpv88m9un55nfn9eu4hhmalj/68653625705.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_off0000de09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE09 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f620.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF620 11012 bytes
SHA-256: 4a25505b883948791a52542596bc2df7c4cda8acb23523a89bf059f35811af0d
font_02_sfnt_off00010f5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F5B 17784 bytes
SHA-256: fcc9ed2ec8ce1e675119ee631a05576551e70b5cc1cb31a3f3597ed52689f55d

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