Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fc92b9d61ecdd5c…

MALICIOUS

PDF

144.9 KB Created: 2021-07-01 13:43:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 492b9c54520c1c7e8b5b110fd67ecebc SHA-1: 9acf3b73db54fab15ab9f7df88afdac585a1da3a SHA-256: 0fc92b9d61ecdd5c0d748cb785ce9d578c4f1fadf6fba56a58293c646483813e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the embedded URLs and the heuristic firings point towards a phishing or credential harvesting attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9470

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://infrive.ru/uplcv?utm_term=how+long+does+it+take+for+ultram+to+work PDF link annotation
    • https://postelezmasivu-zlin.cz/ckfinder/userfiles/files/46642506410.pdfIn PDF document text
    • https://fourseasons.events/wp-content/plugins/super-forms/uploads/php/files/513c3585865cc9a535f909c13c8d7d9d/bakodowisujevijuvixis.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/341d6a5aa64c3fa9b51381ec5af107c5/wadosu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab3892c11b9---53871113549.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088039cf2f7f---tifegupinopokekilexekikaj.pdfIn PDF document text
    • https://pacantioquia.org/aym_image/files/65085874981.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/25986561c501500e4938046eb416c0ec/63686773452.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160932f8780589---xowikagulemedepifed.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16082aabec087f---xamuzevenifakufarowafo.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/dkcbbnpf9avatj5regibp5h4no/93959423977.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d228d987d8---43792161435.pdfIn PDF document text
    • http://hifitness.hu/userfiles/file/moravotowiw.pdfIn PDF document text
    • https://lesura.net/userfiles/file/rovokapunesipo.pdfIn PDF document text
    • https://transpack-krumbach.de/_upload_bilder/_filemanager/file/xexusokowazokemipor.pdfIn PDF document text
    • http://jfk1969nola.com/clients/873000/File/38193996136.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075af80ca76e---55979955479.pdfIn PDF document text
    • http://nw-line.ru/generic/uploaded/27772668001.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/e63a88888758440e4a26fdba06f07e6f/dadejenizebitunemipererom.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/fba49f64ee8a0c48c1a47def7d9cf2d1/biwiremigijodem.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a92667b21da---rusugifukunina.pdfIn PDF document text
    • http://ihvanturizm.com/rsm/files/7565368362.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/d4b3ce47a2c0971bb9e975c5ccd28069/sepede.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-6-25/20210625135001380420.pdfIn PDF document text
    • https://mindspacepsytherapy.com/upload/ckfinder_temp/files/20210530173625.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001a2a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A2A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001bab1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BAB1 16160 bytes
SHA-256: 61893c6f5a4ed8be90b59e62ba5f7845fe3f782be61d2927f64273611613f2a4
font_02_sfnt_off0001d037.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D037 5596 bytes
SHA-256: 2bb8c487ae9e23b3d6d7e7a2057fc42465770b5422b95315a9605dfe5a2cda75
font_03_sfnt_off0001e3d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E3D3 10964 bytes
SHA-256: e5bd7daeff917e7e607c07ffe414c799c59d0363c89005c3652e1b868da6cc49
font_04_sfnt_off0001fd12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FD12 21624 bytes
SHA-256: a0522efb18b4d3a369c71fa221d28f8b0f9694b9aa1e725884eee2f565b2f828

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