Malicious PDF — malware analysis report

Static analysis result for SHA-256 a46e7aedcf2ffc0e…

MALICIOUS

PDF

75.5 KB Created: 2021-06-12 22:12:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 9f4abc7b7e67e0f85af13cb5217308d9 SHA-1: 04855caec77048b82fe5498b38bc8a2a97e11881 SHA-256: a46e7aedcf2ffc0e9394826b990b5537f30be9d8bcae0b4851f5adb4d3440d2f
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://medvor.ru/uplcv?utm_term=kerala+state+syllabus+plus+one+textbook PDF link annotation
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/16099b44fc54ee---busajitavu.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021060617451873499.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/1789dfaef71ad3a624d39911c3512498/85317662073.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607de9ffe596c---68620277261.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/a4f7ee814d983a09954bbcf833154643/42344582606.pdfIn PDF document text
    • http://connect-senior.ch/uploades/userfiles/file/mevufejijowuviso.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093ca65cced8---tojebovakibu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160881da78540b---20054404932.pdfIn PDF document text
    • http://gustosandvic.com/ckfinder/userfiles/files/felakitidiras.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/pqn96u1ce64va0rg4u3mie54m8/31766181638.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/eb83445198ea9b21e1c1794c34505f06/80235974040.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/37fc0571e680e75dd0a63f6dba4b3bd8/bazinamijoxufukaw.pdfIn PDF document text
    • http://akgikorea.com/file_upload/fck_upfile/file/3026681246.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609c6af3b7997---41460304659.pdfIn PDF document text
    • http://snsi.jp/image/news_file/zakufigirirunebaw.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a09ca55753f---48149519324.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
    • 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_off0000de0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE0B 4988 bytes
SHA-256: ea247bc310e0b80c08e104da9a0004d58a33b34ecd0d1f8c9863777b71b292f4
font_01_sfnt_off0000ef15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF15 10460 bytes
SHA-256: fa138c30f21d5fde43a711f6306d253c4e0a540ecc01fce334abc06268c1a348
font_02_sfnt_off000112c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112C7 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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