Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1f4ca87798f09b4…

MALICIOUS

PDF

88.6 KB Created: 2021-08-23 12:58:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: bb0480bba1cbcb6323294ca8aefc5ade SHA-1: c848bc3d8cb67c16487b94ff7f3e9911be248971 SHA-256: a1f4ca87798f09b4c032fd2ace0bd0d69d778a6c83dbf9be660a515ea2a729b8
156 Risk Score

Malware Insights

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

The PDF was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It functions as a link farm, with numerous embedded URLs pointing to other PDFs hosted on compromised WordPress sites. This suggests a multi-stage attack where the initial PDF serves to redirect users to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b40ab21a92b---86885575266.pdf In PDF document text
    • http://bajajsports.com/userfiles/file/64368253931.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/731b30e07eef7ac259e5207d067bb772/65248124839.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/dlelovu579ke1jvlq5gqgj8gi8/kexovepikivuwuwasekeb.pdfIn PDF document text
    • http://gerd-pollak.de/userfiles/file/61131747092.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/63ee027ea28ee02e551c50db9e0d536b/81153393572.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a469ed13b1c---66172951171.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/8b1613653e25c4fca9a15fdd7078da26/kadafipajegef.pdfIn PDF document text
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/jff3qifm7us0r919muvuct2jpb/75833270767.pdfIn PDF document text
    • http://www.asap-recruitment.net/upload/file/4963368402.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1609f131aec953---pokiroxaroxezunuziwogi.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/10024017359.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607abc43c09aa---72132286053.pdfIn PDF document text
    • https://www.lsv-wittlage.de/ckfinder/userfiles/files/64986025730.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608556cfbefcf---gusaparunifuliga.pdfIn PDF document text
    • https://atvatextile.com/upload/ckfinder/files/60354068975.pdfIn PDF document text
    • http://stylekd.ru/files/89808543117.pdfIn PDF document text
    • https://west-holding.com/userfiles/file/tizobepogijebidimezevor.pdfIn PDF document text
    • https://remoteyourstaff.com/calisma2/files/uploads/gokorakevixez.pdfIn PDF document text
    • http://schokozentrale.de/idata/7170873706.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/ef667006f9cddb7121b5308bb2920c94/farabisinewadixemifab.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/pmk9pajr07lp7vosqpjpkghhpv/60633771793.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/b93d1a323f8952b97129c4ad60a96001/85514390821.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/d56df469115e3a255e707a11048364d8/71326016151.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=second+game+of+a+doubleheaderPDF 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_off0000f830.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF830 16888 bytes
SHA-256: 47e9499322731de6914c3d742ccab070f3ca18db7b08a1a39c18ab78286028b6
font_01_sfnt_off000123a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013bbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BBC 10880 bytes
SHA-256: b728c0d03fcebc306106c879e721b268827a4290bd1d2632e6bc0016a63b1acf

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