Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e562e8d768157c1…

MALICIOUS

PDF

98.0 KB Created: 2021-07-22 00:17:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f2971117f92989e7084ae42c9c7a2e4c SHA-1: 212f2b83453c40ba2a24f3884ef70a5b12dae4c9 SHA-256: 8e562e8d768157c1ddb5643614202e1bbba5e4abdaa1880896ec386724c95828
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, some of which are identified as compromised CMS upload storage or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The embedded URLs suggest an attempt to redirect the user to a malicious site, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://botosani.ro/img/uploads/file/41921661904.pdf In PDF document text
    • https://bakwanudang.com/contents//files/77191722572.pdfIn PDF document text
    • http://kaies.net/upfiles/2107081157115387724znfk3.pdfIn PDF document text
    • https://realschoolspirit.com/scauserfiles/files/jexelavuberugagafirafe.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/93b7a1a44bda9fa4c67333b102449022/33089328148.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607da7b6927c9---15504755589.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/994b0f68de4666caca413764b25df2df/63222400999.pdfIn PDF document text
    • http://soundreaming.org/wp-content/plugins/super-forms/uploads/php/files/ff284afd01f44a70ded0bff952cbd792/53639090497.pdfIn PDF document text
    • https://eghamatyab.com/basefile/bainbookcom/files/76732146450.pdfIn PDF document text
    • http://eastindiaspray.com/suvra/eastindia_spray/files/65769065168.pdfIn PDF document text
    • http://954move.com/clients/4890/File/fexapezegimigijizizo.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/16071b76124249---gapup.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/7n71mkst7tqh3jg98q18sd0rbc/6602429957.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077b36e1b3b9---71420817621.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/14f7b570eb6c9c361a665cf1e73015d9/84269575988.pdfIn PDF document text
    • http://saovietgroup.com/upload/FCK/file/vasakudenenaretila.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/593ce43829f6f8f0f3115a57a19dec6c/gokoxogetogosasuxo.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160f2ac7ec64f2---jiserujetodaxasenam.pdfIn PDF document text
    • https://alohasafaris.com/files/82632852683.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/xirevujuresegal.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160da9dba5aecf---vonov.pdfIn PDF document text
    • http://bsinteriordesigner.com/userfiles/files/16656241330.pdfIn PDF document text
    • http://thestarbusan.com/FileData/ckfinder/files/20210702_6AE213F7E9FA1A38.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/83099634237.pdfIn PDF document text
    • https://pediatricpotentialsnj.com/PP/PPpng/files/teliwomajilu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=was+ray+charles+blind+from+birthPDF 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_off00011b02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B02 17120 bytes
SHA-256: af8d7a8d48760e79d3f18aa65158c0af043f1611eddd2d43b8248c2602deea69
font_01_sfnt_off000147f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001600b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1600B 10988 bytes
SHA-256: 349b9012af5be4069f6d54949156d22f12ae5447c85486ea6c0d8f2f5b453dff