Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dfc5778c3d50907…

MALICIOUS

PDF

81.2 KB Created: 2021-09-17 15:47:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 29a77ba8333b279a7ba92730a86d7f15 SHA-1: b6e581e617bec22dad5cf48bae71d7ad21603049 SHA-256: 4dfc5778c3d509077bd2b16d8b2ccd793adcd15d5f58a18274b8cc618c7c638e
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to numerous external URLs, many hosted on compromised or disposable domains, suggesting an attempt to distribute malicious content or conduct phishing. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://aquamedia.cn/ckfinder/userfiles/files/vamulamulemujipifod.pdf In PDF document text
    • https://gemicilojistik.com/userfiles/upload/file/deforitajojoje.pdfIn PDF document text
    • https://buyafranchise.org/files/files/53614268370.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9ff75d02c---81310500339.pdfIn PDF document text
    • http://nationalherbo.com/userfiles/file/49065567192.pdfIn PDF document text
    • http://thepokewave.com/uploads/files/tekixewipe.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/915dc584716f4f3780c73286142f30e2/mixixukoxawagi.pdfIn PDF document text
    • http://hastensandbreakfast.nl/userfiles/file/liderise.pdfIn PDF document text
    • http://sportsbettingconsultants.net/cote_dor_import/admin/ckfinder/userfiles/files/6791994041.pdfIn PDF document text
    • https://office-agglo-larochelle.fr/userfiles/file/88819322085.pdfIn PDF document text
    • https://tecnomatec.cl/upload/file/motolurisagiwerejurilen.pdfIn PDF document text
    • https://media-get.com/userfiles/files/meniledami.pdfIn PDF document text
    • http://yieldpharm.com/upload/files/mabuwufimulapaxunobimu.pdfIn PDF document text
    • http://12shio5.com/contents/files/xilogewajakixexekizozigek.pdfIn PDF document text
    • http://captaincook.hu/userfiles/file/26898676829.pdfIn PDF document text
    • http://erictex.com/ufiles/files/piruwevowod.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/auhqj4e7vpui58l470rv8pk698/76734751362.pdfIn PDF document text
    • http://yaan121.com/uploads/files/202109081149259738.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/fujavaweraxagoduxapom.pdfIn PDF document text
    • http://bimbrlata.cz/UserFiles/File/wuginomufaketuli.pdfIn PDF document text
    • http://pop-around.com/file_media/file_image/file/29892805542.pdfIn PDF document text
    • http://unitec-egypt.net/userfiles/file/95655711101.pdfIn PDF document text
    • http://giprozdraw.ru/ckfinder/userfiles/files/76535603466.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=totok+video+calling+appPDF 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_off0000dbfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBFB 16968 bytes
SHA-256: 144db12814623464246aa5e271252fae3b7b927d1f276547a7b1e88b87b304f4
font_01_sfnt_off000107d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011fe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FE8 10544 bytes
SHA-256: 9352c4bcf470651bf2b62abddeaf771530f09ee12051c2829763e9af0cfe7b12

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