Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b0fd870874999ab…

MALICIOUS

PDF

93.6 KB Created: 2021-05-27 04:08:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 799237ff0485236cad51f95d52565b21 SHA-1: 7ef5598316caadae2e2f41b1e886ba55a874ae99 SHA-256: 0b0fd870874999ab3272110afd8558779958facb3ad9348802cfe6849192f9ae
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories, indicating a link farm designed to host malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent. While the document body is heavily obfuscated, the presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics confirms the nature of the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ac59eec8fbf---pajutojewibapeposutu.pdf In PDF document text
    • http://dent-pro.cz/pic/file/39229877922.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/1oimdp3n5h2t724bofajfk6hao/gegurita.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/14a7c80ed1b483a48e9695d43f9de04a/vozadedixamux.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac708231e9---77313572680.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/godekesaxunive.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b98bf9e552---88214110799.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/gigedumixebu.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/f2762a71ddc873128625a497169d6afa/kukezujiwitador.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/1cc4e99553060b1a61fa4fa5b6f99a23/niropik.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16086ebeb1b0e5---27332091502.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b3625681ea---fewaxoriwe.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/e045e24238211153b09b9ff1f18a536f/9206447228.pdfIn PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/d62ef042662bd4a5d602bc8d3e8a39fa/92462794397.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f67abebe50---77488512336.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160867a99d505d---96810292490.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/ojdo8vf19lsro7vgc4q233o1o6/44050622884.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=how+to+make+the+best+city+in+simcity+builditPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000121e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121E7 5324 bytes
SHA-256: 0e8254196b6b17a3efb714eb974baaca61e6e0ec80e471e6bb5c41823c8a2ae7
font_01_sfnt_off000133ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133ED 11508 bytes
SHA-256: 235440620e824b8aa888e34dfe66fe9cd1ff935d6baee11194e53edf746ff61a
font_02_sfnt_off00015af2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15AF2 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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