Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc3725ffa3f68cf1…

MALICIOUS

PDF

80.7 KB Created: 2021-06-27 09:44:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 33197133d250067752d28515f17853e8 SHA-1: 4a0554895f323752c477ff8edaef957bd77f4ccd SHA-256: fc3725ffa3f68cf1212b9ef428af326faa74561f480b01b2468f5fd28fd20fc5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links to compromised WordPress upload directories and disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure itself does not contain readable content, but the associated heuristics point to a link farm designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9793cadd1---mulasamevajevafusuz.pdf In PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/04729f8c8ce16ef4c7124b02defc1a3f/71934008641.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b61e7489178---nalulitakolelasunezewe.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/dra2dva30mkhk0kjss3kg1b8ph/fewuwerilukovoji.pdfIn PDF document text
    • http://vet-arrighicolangelicristilli.eu/userfiles/files/98102864243.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/tizimexujejizilu.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/68342783648.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/p13tsv0k7l84dmvn7r94h3dcci/44901431161.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a2de0680ab9---gobibebilulevinudadade.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078ec494f04e---69266303756.pdfIn PDF document text
    • http://yuhenganquan.com/userfiles/file/20210531170329_1689159948.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adb5e10626a---laxulewogiwelewawukovi.pdfIn PDF document text
    • http://trunglam.vn/uploads/userfiles/file/25846793972.pdfIn PDF document text
    • https://feltshoe.com/userfiles/file/rapogifosumez.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c022a304ebf---bukibeporaduzakebarudiri.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160a3958f8227f---46131398704.pdfIn PDF document text
    • http://reanda.com/jingkelun/userfiles/files/20210622201019.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/jhu3cgk9t2o51916f0l2tks382/18110982611.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/5qjta8be9ui212iftfvscfvr63/didudasaxozin.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16094cf07185da---xifekajizitarutiribep.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d3bc9355508---naxujagefet.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/hh40nj17dt9a8dsha05tabpli7/6645769420.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/35564424681.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e998391eb8---rugaratan.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/kq3vpkr564okad0e6k2tcpg8eg/zawoxikebizex.pdfIn PDF document text
    • https://biocoils.com/img/file/10425855976.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/75000255939.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=windows+nt+network+operating+systemPDF link annotation
    • 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_off0000d7ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE1 10976 bytes
SHA-256: fe6101850f95f4b73487d11b53037b444d72d8607f546fa5cfb2ed7843f77395
font_02_sfnt_off0001093a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1093A 17052 bytes
SHA-256: f16e3e5df3ada2139f7a5b8ae1171a012300df3bd6a785c8847237ced2be4631

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