Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8f1cacf2b21b5f0…

MALICIOUS

PDF

83.3 KB Created: 2021-09-06 18:11:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3fcdd883901e051033998aa312566765 SHA-1: 6bb4a6a4a8666b1d87afb5d0087755faa2f5819d SHA-256: b8f1cacf2b21b5f022726f876b7d7fcb4d240e136c53ccbe01cae725ec6f95cb
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of multiple external URIs and link farm heuristics points towards an attempt to trick users into visiting potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://garglob.ru/uplcv?utm_term=fixed+assets+management+pdf PDF link annotation
    • https://elearning-chemistry.ro/userfiles/file/49822459522.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611beaca06550---donawozusifita.pdfIn PDF document text
    • http://lotusromeo.fr/app/webroot/files/userfiles/files/paxatajavebamomavo.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a62438ba124---zodugal.pdfIn PDF document text
    • http://tensoinox.com/userfiles/files/nelegimisiwetofiw.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161247715422d2---xawomipimokowobe.pdfIn PDF document text
    • http://dainindo.com/Uploads/userfiles/files/niwijusidakor.pdfIn PDF document text
    • https://atrax.eu/userfiles/file/88822728568.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c87eee659a9---38696509714.pdfIn PDF document text
    • https://koffiewarenhuis.nl/app/webroot/files/userfiles/files/49082651689.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/69adcd6c277024d963d5b12fc63d5a12/96454589626.pdfIn PDF document text
    • https://ecole-anglais.com/upload/files/sakifalixodowa.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/55509786627.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8d2837dc4---kidowukexebukuxujubuz.pdfIn PDF document text
    • http://kozszemle.hu/uploads/files/240708554.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1d2d8b6c58---vadogapopupowepovez.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/36200188524.pdfIn PDF document text
    • http://zamokugrofa.sk/admin/fckeditor/file/panosidimalo.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/43741719099.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/1610881b24cf9b---bulujunonafekelaso.pdfIn PDF document text
    • http://chenruichem.com/upload/files/54793527747.pdfIn PDF document text
    • https://sokolzgierz.pl/web/uploads/files/sefupem.pdfIn PDF document text
    • http://vertracapital.com/uploads/files/37356003279.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/58f421af4b13ea3737a8f59f4b590dc3/lupawazepipoxeluri.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_off0000e319.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE319 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB2B 17112 bytes
SHA-256: 0bd3c91d1945e0d6a0f7a95f7f9e2fc08e1a941165a0be6aca11780b0a08d786
font_02_sfnt_off00012762.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12762 10652 bytes
SHA-256: 90d35e6d54489363c40f9dfea589e8b37d408f2de878d901c7ef3d76ecddea62

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