Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9455846c76fa560…

MALICIOUS

PDF

98.6 KB Created: 2021-08-09 15:01:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f7096bfe894d974490bd663596b406ae SHA-1: a6af550bca64e956957c8ad0486d074bf5fb4b45 SHA-256: e9455846c76fa5606d910335cfecb64acc9b6909169aa22fe8ee01f48dca2933
104 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to numerous compromised websites, many of which host other PDF files. This suggests a multi-stage distribution or phishing campaign. The ML classifier strongly indicated maliciousness, and the presence of multiple links to compromised CMS upload directories reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.ks-zahnarztpraxis.de/upload/files/45393528584.pdf In PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/4dp4lg8e5gh61jemvmkq99lli7/86267362873.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/ik3ut8mvqp5otu2d5uf06cvhoe/kemotisas.pdfIn PDF document text
    • https://kp-bs.ru/upload/files/82892363422.pdfIn PDF document text
    • https://alutat.com/data/file/98951447416.pdfIn PDF document text
    • http://jouezadomicile.org/clients/4/49/49939bf6a151252ba1adfe53d1befa29/File/94710176491.pdfIn PDF document text
    • http://gyobel.itpublic/file/8117911007.pdfIn PDF document text
    • http://associazionemillesogni.it/userfiles/files/wamewepiregilaxi.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/lhemtlr9g2kccrc6q0s6dsdo2v/91314391540.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/95e3f6ptv0dku0v1jlou15lg6p/dositi.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/b879d00106fcc39a41a1f362c17dbb60/nukilofa.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/aa297aaee6827e5bf1c5d82356e15868/pezagiligodamij.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/86im48fmh69gsn36dkh6nlolej/vopovademapojat.pdfIn PDF document text
    • http://asupuro.com/upload/save_image/files/gotexub.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b1ec4f6e5b9---motudawovavo.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/sojutanixaso.pdfIn PDF document text
    • http://kdbelektrotechniek.nl/uploads/file/31807216208.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607db0e66b6c9---nodokexapikiluvudesow.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c97d2129b0---tenusib.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/aqb5hqaod218etvaaoo8qbh0fi/64405247502.pdfIn PDF document text
    • https://arrayamed.com/userfiles/file/rozorori.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/d1b0d18c17b679cad212384fb2086d00/sexepudekisez.pdfIn PDF document text
    • http://gyndoktors.de/ckfinder/userfiles/files/jimikeranavagawu.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160758d170dd06---21964068977.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=strucid+hack+script+2021PDF 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_off000117c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117C2 19832 bytes
SHA-256: 0d231a36e33c39839a1bf5af21420af22851bb398b593ae52e1b3d83bf6f89e8
font_01_sfnt_off00014a8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A8E 10768 bytes
SHA-256: 1a4a994ab4e9b95e6430921c00977c60b9eca4675e4e6aa4c6a215f2de95141b
font_02_sfnt_off00016393.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16393 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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