Malicious PDF — malware analysis report

Static analysis result for SHA-256 563c22e577723bf8…

MALICIOUS

PDF

88.8 KB Created: 2021-06-26 01:58:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 99698b30dfa432d1e2124a8f3a066428 SHA-1: 3c952f8844048a2c89d056efd48580d5ac67e6af SHA-256: 563c22e577723bf8826cad5aaa0d5175cd79b3717513e0e0dd91f9a6199f52ec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute further malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160885cf9deea9---domilofodojuzisur.pdf In PDF document text
    • http://smclassof57.org/clients/34860/File/1713175825.pdfIn PDF document text
    • https://www.anandtirth.com/wp-content/plugins/super-forms/uploads/php/files/0n7njd79rd1cf1uv5457u2vkd2/xelesese.pdfIn PDF document text
    • http://pratiklinik.com/img/userfiles/files/jurediborajizawuvininu.pdfIn PDF document text
    • https://habrit.tw/ckfinder/userfiles/files/fonexaz.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba9030fab2---bewesefito.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7b3d0dda3a---xemawixuxobazu.pdfIn PDF document text
    • http://zionhillfirstbaptistchurch.com/clients/73368/File/48399945606.pdfIn PDF document text
    • http://m2mus.ca/clients/b/b1/b1ca46fdb12d68e762e4a8b3318caec0/File/45232569663.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/46aca2d7123b9b907e227d6d1cb27c2e/28521208121.pdfIn PDF document text
    • http://urbancollab.com/userfiles/Proj_Name//files/jalizu.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/b247b9726dc3416dbcf0f9d6a02810d0/tumunobipinijasalod.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021051012094873499.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608230ae031da---mifugix.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b644ffdc895---42339923927.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/33430715705.pdfIn PDF document text
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/dibagiberiwifalima.pdfIn PDF document text
    • https://leuphuotcamap.com/uploads/image/files/navifape.pdfIn PDF document text
    • https://smartmedia.ro/app/webroot/files/userfiles/files/59869685075.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/4ntr2mi6edf8rmu4udjfn97loi/25733345345.pdfIn PDF document text
    • https://netiko.ge/img/Data/file/49258490990.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/25740149909.pdfIn PDF document text
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/girozutuxekop.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021062300324780.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=i+feel+fat+and+worthlessPDF 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_off0000fadf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFADF 10396 bytes
SHA-256: e688ec8bef5a007a772941087c62e14d08d5d9518cd2f71c29d698d785644e55
font_01_sfnt_off0001126f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1126F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A81 16804 bytes
SHA-256: 26fec75138070d92ca477f282e22498ef6e5170cd032942c8e1630e315cc342a