Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0c1c7ee5f28285b…

MALICIOUS

PDF

74.6 KB Created: 2021-08-28 23:46:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 40f7a5e9c8354d0811235a218a0ba112 SHA-1: 0e7eef3234021786e6f0d6896e184eafbdf952b4 SHA-256: a0c1c7ee5f28285b8e0f1a5541449b5e9004c08b61c54769f88836f1cf42139b
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL analysis point to a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://rybarict.cz/webpagebuilder/ckfinder/userfiles/files/86281187332.pdf In PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/gua1ihvavqgvhir9u5npjn7f43/mowosuxotufuzel.pdfIn PDF document text
    • http://egyptlance.com/userfiles/file/kivewefozekafukulefimodel.pdfIn PDF document text
    • http://orhs89reunion.com/clients/77823/File/mekigolopi.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/taborizepabigunipusagex.pdfIn PDF document text
    • http://weifong.tw/fckimages/file/wusanegisirupesaxesudole.pdfIn PDF document text
    • http://colleges-in-tamilnadu.com/FCKeditor/userfiles/file/88970508836.pdfIn PDF document text
    • https://vieclambaohiem24h.com/upload/files/38101229772.pdfIn PDF document text
    • http://pensjonatagat.pl/userfiles/file/61838381881.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/976c116777a0621352b02654ad119e36/kedareruronojepojikekodep.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/3998db9f6af44ce865121c40fc7f51e1/pifobazitowi.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/76rb9tobeqrrce176tjeggkkeo/xiremukafurobolakufobovaz.pdfIn PDF document text
    • http://akwarella.pl/user_uploads/file/58091073973.pdfIn PDF document text
    • https://hydratrend.com/application/third_party/ckfinder/userfiles/files/gidavikonusimot.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/bf0d271b065707b7045bf26b6e15440d/50745156113.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a05878c0114---zadezi.pdfIn PDF document text
    • http://maychamsocda.vn/images/userfiles/file/wikurewar.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/66177810361.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/6c6b0d0f538b79f5ed032378263497cb/rajagutoj.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aed88013eac---25269976453.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607968037982f---43249651983.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/kkp3s4qsvqpp5917ak5h6ur2v7/83350882810.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/61235c91224eb8265c4d3249dc70bd6b/3365246052.pdfIn PDF document text
    • http://pogologistics.com/ckfinder/userfiles/files/56274910534.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/226e5d8d2dea68ff17654820743b46c0/noxibunosedozalazi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=orientation+in+swahiliPDF 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_off0000c0da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d8f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F1 10316 bytes
SHA-256: 8e0c8f022f5660e98a368ed8d3fd8c53bf5ac508175be7c11a19636ca9a55071
font_02_sfnt_off0000f034.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF034 16764 bytes
SHA-256: 25fb37c317f4bea724163878e3d0528c46b4b86c928a3183551b5d7c5385b277

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