Malicious PDF — malware analysis report

Static analysis result for SHA-256 807f8f9591f5b198…

MALICIOUS

PDF

98.8 KB Created: 2021-09-05 06:54:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 6b1118d7d8501f5f9bd3ae1d6104b279 SHA-1: fe1136f912afdbdd3a8840918c07cb0f8b220eb4 SHA-256: 807f8f9591f5b19804f2bc53cc2ef67d4f6d8c63829bb6c588ecb6261b314da4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9870

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 https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a6e6a04e3a1---lupenapexabuzopixitane.pdf In PDF document text
    • http://studiocommercialedelpiano.it/userfiles/files/7614422723.pdfIn PDF document text
    • https://signika.pl/Upload/file/80014196138.pdfIn PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/h1lhukhuusjl5v3k9i0mgae7o7/leperugaxo.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/9fombfm9uvhda5ustji5gg6i93/sudebosu.pdfIn PDF document text
    • https://butchercurnow.com/img/shop//contents/8889547977.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f005eeef9a6---doduxovapiredinitaxeju.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c52a8676941---13869412922.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b0m0rhvrdaukkc5cg4of10biu1/44466812410.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611a34251897e---34251346737.pdfIn PDF document text
    • http://pijntherapie.be/uploads/files/velosakavamenajewako.pdfIn PDF document text
    • http://nppgursaraijhansi.in/ckfinder/userfiles/files/77754028303.pdfIn PDF document text
    • http://kinocosmik.ru/sadm_files/kufazagisiduruxuso.pdfIn PDF document text
    • http://saovietgroup.com/upload/FCK/file/35845819266.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/zoxizev.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/08910c68e8351efe3b0d4897abb8126a/nefegudopugawadu.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/m3enn5obsbuigjv4ug1tqd2217/60617917734.pdfIn PDF document text
    • https://stopserv.ru/files/file/69414897101.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610f8d19b9a3b---54090628205.pdfIn PDF document text
    • http://humboldthighclassof79.com/clients/1/19/19f040aad945c40a0acbd79abd3dc6cb/File/gobenagobox.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/327d79b4e1ae4e709329324da5b4ec24/62071460042.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/6am2466916sfgts6leq6cu4n04/navunufolimejifisexoxuki.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c098979d56---90544140474.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/9ec39579b10400f57eb61e34b9c95ac4/wogatopew.pdfIn PDF document text
    • http://taiwanglassgroup.cn/userfiles/file/11328848133.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=parenting+phrases+in+korean+pdfPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D3 1936 bytes
SHA-256: 581ee6410b39f3fc3c0b7eee44a1f688a16d32601ddb4ff915e7da4a385d4a1a
font_01_sfnt_off0000edc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC6 16548 bytes
SHA-256: 4c7b2107e3620f537d0add9cf7dd7071a96701f14d10c0ccde011e5c67cbc841
font_02_sfnt_off00010516.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10516 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00011d28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D28 27880 bytes
SHA-256: a027ea1788ee025c2c54964e74eb1eb7023ec42899871950eaf822f9a9eaf810
font_04_sfnt_off00016350.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16350 10824 bytes
SHA-256: 691323010565c93cacdd30ed59b86199fd1323ad03a1fe89714fc1a7d5247799

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