Malicious PDF — malware analysis report

Static analysis result for SHA-256 1137e1bb2d380d66…

MALICIOUS

PDF

91.0 KB Created: 2021-06-29 21:29:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e386ee86a954ad90d07670c8973c1d28 SHA-1: 1da08e17704e7b9ac419fa33529e788a1864681b SHA-256: 1137e1bb2d380d66960f2f2dcea54e7a53a927bbc733440399ac82291a7952c6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classification strongly flagged it as malicious. The presence of multiple compromised CMS upload links suggests an attempt to distribute phishing pages or malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/qa2u1p9sunmq934trostaaat33/sumowenewipagonokasekaze.pdf In PDF document text
    • https://ilcaminodaugo.it/file/revevanop.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa33d7b6767---21095327866.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/vesowikul.pdfIn PDF document text
    • http://lovelyspa.net/ckfinder/userfiles/files/povufoxejagifalalawowuwo.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/te0nqtntqi19d58ed1t3f851jm/xatexelojofaximu.pdfIn PDF document text
    • https://infotechb2blite.com/bot/ckfinder/uf/files/veduvekaxifolojuxibilutat.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/ee564c83630d3e7f3c78d98c89c23e34/7738339412.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b98f08599c---sujodesuritasazazekon.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/sewomubojipinevorifapoz.pdfIn PDF document text
    • http://ip-golubev.ru/ckfinder/userfiles/files/79233316365.pdfIn PDF document text
    • http://aquatrustfina.com/userfiles/file/wanababo.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/gmp8i6a5uvrpgj0s1pl4ujvuo2/bifukekuma.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/ee2918bd519c9bedcf766fe1df9ed883/tofuwufibozuparox.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/faburejibevowivofodo.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/9d1a4d410fcf825ea7aa8e54f2b13081/13350073035.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/82027948868.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/91ec470aac811002e1901ba35994e5a7/53946008814.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/v2u37rp5pgmflce47i3nknhf6d/87589225967.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7b35a23c02---wenorobetumusebamipuwe.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083a187ca7a9---nibopopubigudalebakibepir.pdfIn PDF document text
    • http://ruoumoc.com/upload/files/37583625758.pdfIn PDF document text
    • https://annjulieskarpmo.com/userfiles/file/10446213589.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=taguchi+techniques+for+quality+engineeringPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C7 16916 bytes
SHA-256: 24c8e8cfefe92325e64ff16d83312b599192d24a1cb1e8970d0ab6cca199a756
font_01_sfnt_off000120c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120C0 2384 bytes
SHA-256: cb7474f2750d3cb4ffbf93c785ffdf52e68f031a841a0d6929a951ef95990720
font_02_sfnt_off00012b3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B3F 10936 bytes
SHA-256: d2313239d5cc797641fdd42094071eb1dba8097adfee3384e6e16c531ed75ef6
font_03_sfnt_off00014452.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14452 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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