Malicious PDF — malware analysis report

Static analysis result for SHA-256 1157c6ad335a4e71…

MALICIOUS

PDF

86.0 KB Created: 2021-09-07 09:57:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: b9e273895491335fcc78bb03617de73b SHA-1: ce37e507484672b0e58f29f5fd0e453c92ab9ef2 SHA-256: 1157c6ad335a4e71b2e78c0496f5bd0d8ade29f8f1105779a5a4382b793fbb1e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://kottayammedicalcollege.org/CMS/ckfinder/userfiles/files/bepubetote.pdf In PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/9df90c4d45c26a7c822a15131dca0d07/95188066152.pdfIn PDF document text
    • https://listapp.in/ci/userfiles/files/4206863793.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/xaxififanalevuzerulaj.pdfIn PDF document text
    • http://investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/rudameben.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a06a8712a7c---28686131462.pdfIn PDF document text
    • http://icloudcleaners.com/uploads/account/autoresponderfiles/75510772246.pdfIn PDF document text
    • http://americandeliorder.com/uploads/files/bobufuxove.pdfIn PDF document text
    • https://nestaerospace.com/uploads/file/76649596849.pdfIn PDF document text
    • http://jinanxintiandi.com/userfiles/files/kazogodaduzebisetosul.pdfIn PDF document text
    • https://asfus.net/virgsurv/userfiles/file/5504563548.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/b8db1b026a641ce14b8e94aa9f385fcb/43157699258.pdfIn PDF document text
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/61b6a637036784d89c8f3cdad99f98f0/70925981747.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/aa604536390b62b7a8f06db3021abab5/72129027279.pdfIn PDF document text
    • https://avphunter.ro/ckfinder/userfiles/files/mevufereronevabibapo.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160850f8bd918b---tufozunarog.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/828d62253653a9ea8c82b1ab1e76c2f5/dasidusokopok.pdfIn PDF document text
    • http://formel1vermietung.de/userfiles/file/68906852394.pdfIn PDF document text
    • http://xn--e42bt3l.net/upfile/files/dikawesape.pdfIn PDF document text
    • http://cuacuonanbinh.com/userfiles/file/dijoxefepadudi.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/ad58f19c88b3c65bb03539d90cdb774f/vokugupofinalub.pdfIn PDF document text
    • http://usmleworkout.com/files/file/bijezomamela.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=fuzzy+k+means+clustering+algorithm+pdfPDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/57977681189.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e766.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE766 11408 bytes
SHA-256: 7c3a886998fb8e305255513331c0c773eccae107f9c2babb81fce6aa10c69fdd
font_01_sfnt_off000101fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101FD 18240 bytes
SHA-256: d7058131b92833057600f8ec2601d2542bcf9605122c738292ee2870e48fd909
font_02_sfnt_off000131e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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