Malicious PDF — malware analysis report

Static analysis result for SHA-256 d193068489558209…

MALICIOUS

PDF

82.1 KB Created: 2021-09-02 02:43:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 41e5d0d78c719883facabd9bb2510b58 SHA-1: bbc09e1ab5c98aafe6eb743012d3e18af6a09c46 SHA-256: d193068489558209cbab91d00f4ba56f1187c911c405046b247a802ccd63c1b4
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous embedded URLs, many pointing to compromised CMS upload storage or disposable hosting, characteristic of a link farm. The primary purpose appears to be directing users to potentially malicious external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/f831f13278c52a8c3ff374b3c9696b08/50938586464.pdf In PDF document text
    • https://daiichigroup.net/uploads/news_file/65770859847.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b9774e941f8---93616884416.pdfIn PDF document text
    • https://barcelonamedicalcenter.com/files/galeria/files/bonamijulefegimaretufog.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b969d6937c6---24478480457.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/vipalawewuvaxuwiraguva.pdfIn PDF document text
    • https://all-stage-meditation.tw/uploads/files/610e70a0880ae.pdfIn PDF document text
    • http://tiramisu-o.com/yamituki-n/uploads/files/bixed.pdfIn PDF document text
    • http://www.kizkulesikizogrenciyurdu.com/public/ckfinderuploads/files/suxupitazawolowijisamato.pdfIn PDF document text
    • http://noithatsah.com/webroot/img/files/rimijenotulomadaselago.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/ohrfnsp1gjhi9ptfvb7m5ms5pc/zuzaxef.pdfIn PDF document text
    • http://constantemail.com/userfiles/file/1625021678bapupazupanoj.pdfIn PDF document text
    • http://istanbulballoons.com/ckfinder/userfiles/files/napoleluzenulafowuretumuv.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/lgd1siu6gndmd23d8em1kb4f9n/lafokexezezexatige.pdfIn PDF document text
    • https://masini-de-ambalat.ro/images/userfiles/76042783162.pdfIn PDF document text
    • http://nano-vip.com/ckfinder/userfiles/files/buledekakarefowivus.pdfIn PDF document text
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/qq8dqb8lto5mtbg6in85c45fks/43987090449.pdfIn PDF document text
    • http://nfc.soo.jp/file/zilinewajavotomuk.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/5e1d83e42cb8c0c3996cec23c0f485c6/6259385170.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/26513742633.pdfIn PDF document text
    • http://mgocsm.in/userfiles/file/83740901829.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160de184328524---bexavodigubig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=height+and+weight+proportion+chartPDF 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_off0000dc5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC5E 17972 bytes
SHA-256: d8398d2b0c75316babe523fe62b3beee29933e03e67391d3b91e5ca678e07011
font_01_sfnt_off00010a7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012292.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12292 10656 bytes
SHA-256: acdf9ea295b8e59800a986e4899a757e7b9bede6d5cce2c6fd241dd96aebb8ca

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