Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad1515beea9890b0…

MALICIOUS

PDF

72.0 KB Created: 2021-09-06 14:38:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 88dff2756244805b881ffba6e6a86cd8 SHA-1: e2d5f697f682b656989c203bc053c5ddca156986 SHA-256: ad1515beea9890b08e76bd0f0c2c3bc59c00d119f3257bb6c2b255b9ee4c8314
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • 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.
  • 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.skk.com.hk/admin/ckfinder/userfiles/files/fatesolawoniv.pdf In PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160894b5c49531---29431808991.pdfIn PDF document text
    • http://brukikostka.pl/uploads/page/file/guzowapekulofe.pdfIn PDF document text
    • https://aynadakikemalizm.com/resimler/files/nurelulolopuxukopoxeko.pdfIn PDF document text
    • http://serenetour.com/image/upload/File/22370197677.pdfIn PDF document text
    • https://www.channeloflove.com/ckfinder/userfiles/files/34448464642.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160779e05063bb---36288379406.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b72a3911a26---29988672168.pdfIn PDF document text
    • http://palakkadtourism.in/ckfinder/userfiles/files/gapovujuzen.pdfIn PDF document text
    • http://fredericjean.net/oplusco/file/96298865703.pdfIn PDF document text
    • http://dongshengcable.com/images/upload/File/35900748098.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/79352c18ef353447560403fbe4f400cc/mowasizawefi.pdfIn PDF document text
    • http://korean-school.hu/hangul/userfiles/file/47547004921.pdfIn PDF document text
    • http://ranahytta.com/ckfinder/userfiles/files/ralorisarafilaw.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160983a4d0e4fe---41698748850.pdfIn PDF document text
    • http://refta-bg.com/userfiles/file/duvuzegixujejesawozudasob.pdfIn PDF document text
    • http://1-cities.com/blog_images/blog_/file/43666462394.pdfIn PDF document text
    • http://baiduvpn.com/upload/files/pupugomixiponurafegu.pdfIn PDF document text
    • https://franchise-vietnam.com/app/webroot/img/files/7869453688.pdfIn PDF document text
    • http://bakkervoorwinde.nl/app/webroot/files/ckeditor_files/files/benuvogugobomo.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/16993591114.pdfIn PDF document text
    • http://scheiden-maassluis.nl/uploads//file/ninutebipeboruxuvinuwuze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=levoit+purifier+manualPDF 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_off0000b4fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4FB 10476 bytes
SHA-256: 683e289b17ad7b6f1914240e9796424bc75d1867f6f8a5789359d961ea5920ca
font_01_sfnt_off0000ccc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e4d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D7 17692 bytes
SHA-256: 5ab055e39e64ce00731ae6021bd21f6cd14cea66c12c7e5e6478ba0bdffa9700

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