Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f01e2330b2e1700…

MALICIOUS

PDF

75.0 KB Created: 2021-09-08 05:05:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: e503b130e1e9312bef0625dbd1ac8e1d SHA-1: 9ccdb98d3e4346f4f007418a557348a97b8cd14d SHA-256: 1f01e2330b2e17005ed81c2da43d3ecc74a3c44194328ca4a5cdf0e3102b9ec2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution intent. It contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the overall structure strongly suggest it's part of a phishing campaign or a downloader for further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://catamma.ru/uplcv?utm_term=simple+subjects+and+predicates+worksheet+pdf PDF link annotation
    • http://irina-beha.com/ckfinder/userfiles/files/minugitadutulu.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/goxawawemelafatux.pdfIn PDF document text
    • https://rintrans.com/files/zujosuxi.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093cc9654907---bijibisosabilom.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb048bb576f---57420343214.pdfIn PDF document text
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/fexaradinusokujofi.pdfIn PDF document text
    • http://thelewisfamilyreunion.com/clients/c/ce/ce72a6ed4f7059d305e3bbfb121cee90/File/rapunekimezusenowuw.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/50ec7007e2d4fbceadc9f64b9e2398bc/kadenuboxine.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a80150bfa8---xuxelipesuwoleboted.pdfIn PDF document text
    • http://zimmerei-possert.at/28589836553.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe7f67a6edb---selowiwiregadodogidap.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb3144b008---sidodatupigepuvanuroduxil.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/6d7203be1e31b1966976e424e3307729/13668082511.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/59365646440.pdfIn PDF document text
    • http://klick-tipp.at/ckfinder/userfiles/publics/files/85742197106.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1611c68a1166e8---wuwokevalapokunoturukava.pdfIn PDF document text
    • http://biometria.pl/photos_fck/file/fisivifogadugiwulak.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/c05f51567dcc9408db8e9f365a5200ff/2832387035.pdfIn PDF document text
    • https://autopratichesas.it/file/somol.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/bapojezurugumumub.pdfIn PDF document text
    • https://caror.hu/ckfinder/userfiles/files/salidana.pdfIn PDF document text
    • https://www.disbel.es//ckfinder/userfiles/files/jamuvizotuzodabekimi.pdfIn PDF document text
    • http://mt-filtration.com/uploaded/file/2660963796108f80b1f396.pdfIn PDF document text
    • https://penmypoem.com/new/admin/uploadfiles/file/lapiwefutufekukulub.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_off0000c267.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC267 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA79 15952 bytes
SHA-256: 434a3dbd0e09ea090cdcf45fbc555f6e5cb6fcddb2ef4b72cfe6e2cd4db8bca8
font_02_sfnt_off0001030f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1030F 11508 bytes
SHA-256: 82ee13531a80496a4a5b81900b1a5965404cf31174088c65c00895607868d8a3

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