Malicious PDF — malware analysis report

Static analysis result for SHA-256 806631b6bc8b2362…

MALICIOUS

PDF

83.4 KB Created: 2021-09-01 12:59:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 04d609d374db5d10cb6e97ea062f808f SHA-1: fd223602bd4a8165e3cbf17a7d08de486b972a70 SHA-256: 806631b6bc8b2362ec4aec6fa0124c7d78330fa13ed2fd24a6921e79dd6c3267
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to potentially compromised websites, identified as a link farm. The ML classifier strongly flagged this PDF as malicious, and heuristics indicate it is designed to direct users to external, untrusted resources. The presence of multiple distinct hosts and the use of 'utm_term' parameters suggest an attempt to obscure the final destination or to track user engagement with malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 5

  • 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://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d79634b87f9---woxutobovazupelev.pdf In PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160f2f7f80e727---kobowubexizavopawagapok.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5la7njjpj7i9re8hed5j17pas5/naxalig.pdfIn PDF document text
    • https://togeltop.net/contents//files/35453457138.pdfIn PDF document text
    • http://henghuitong.com/jingkelun/userfiles/files/20210819002441.pdfIn PDF document text
    • http://istrouma1971.com/clients/9/9b/9b88b062b8d6af44b28e209fcb06d7d5/File/zitakos.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071e038e2075---58156199291.pdfIn PDF document text
    • https://a5productions.com/home/a5pro/public_html/ckfinder/userfiles/files/zexulisezopizuni.pdfIn PDF document text
    • https://ppuhperspektywa.pl/files/edytor/file/74314517049.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609a6f94e68da---virefadabixobibukiwu.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/ruzijeziwopitewipilirefel.pdfIn PDF document text
    • https://pearproperties.in/userfiles/file/nubaxalisafaguwogumojike.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/ca79630752b1d0937040246231aa3d9b/60879583520.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/bbe6421936852473428187b528e52b87/4250831544.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/fezebuzazukiwukeke.pdfIn PDF document text
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/58edfa643b81da606edd6aac97825d0b/rosoxukufito.pdfIn PDF document text
    • http://vasset.bg/userfiles/file/84142248571.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/958607bfadf1a0126ed9a3291744050a/81357452798.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/bewijobesopapapa.pdfIn PDF document text
    • http://waterlootour.com/FileData/ckfinder/files/20210609_E84FEFB8EB8FD966.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/7d04800f9d8bfbe9b68953b3ad4b4b46/gukofesuzifujowakiva.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/k13hkrq9776g4b1mr3l0gp0592/84620504988.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/k4muf7epvrjo2k0otk571go16i/41692220904.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/jcbb28ioc1j37nbp4d1ccu2cqn/58361949445.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c0d40e793c---vujeti.pdfIn PDF document text
    • http://kidneytracker.com/ckfinder/userfiles/files/duwopefirokimusuxuzor.pdfIn PDF document text
    • http://tcyy88.com/userfiles/file/2021081721572473499.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=huey+lewis+and+the+news+american+psychoPDF 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_off0000ddcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDCC 18252 bytes
SHA-256: e955906b6da0a5d915e7c47a56a90b8b9a483d145ad4a410a94aa6c5d323d23a
font_01_sfnt_off00010de7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000125fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125FE 11072 bytes
SHA-256: 69ca8acc62d7f7ebbc96b23dccea7891cc30a3869d17b98e31d69d70dd3e2f55

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