Malicious PDF — malware analysis report

Static analysis result for SHA-256 4baf9cbcd6096534…

MALICIOUS

PDF

80.4 KB Created: 2021-09-17 17:33:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bb712ea89800d19b0fbc80425612fc35 SHA-1: 4d6c2034311d245eee6bd04e3d9e3c2edbfe3c9d SHA-256: 4baf9cbcd60965340562bf0222d11e8a63a28726bf5db8fe1ebfefcb8ad83fba
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 or disposable domains, indicative of a link farm designed to redirect users. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. ClamAV detection further supports the classification as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://kaitosushisb.com/uploads/files/kevojunori.pdf
    • http://mnarch.it/userfiles/files/baxetexinoxesiwepu.pdf
    • http://iccj.jp/images/uploads/fckeditor/file/59821755015.pdf
    • https://wrd13.com/force/file/27656450560.pdf
    • http://pro-customer.de/userfiles/file/jelabifetibenewaf.pdf
    • http://twapp.freshkon.com/upload/files/33223633735.pdf
    • http://smartwealthhk.com/userfiles/41173390955.pdf
    • http://kengosushionlineorder.com/uploads/files/fitig.pdf
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/2449996c0df9d269da6d5f420557a8e4/woxurawijikavo.pdf
    • https://asiantms.com/ckfinder/userfiles/files/marunefumafojupepawujome.pdf
    • http://pjzhengwang.com/upload/file/20210909_033541_176.pdf
    • http://peoplefineart.com/assets/202109/files/20210907231410594127.pdf
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16142256b91533---gilasog.pdf
    • http://mardeestilos.es/fotos/file/kisuz.pdf
    • https://mimpisiluman.com/contents/files/vulomaginifewegetedinid.pdf
    • http://dailitara.lt/bites/uploads/file/jexipilugupon.pdf
    • https://ptogel2.com/contents/files/74534016457.pdf
    • http://ptichile.cl/userfiles/file/406083733.pdf
    • http://gapp.fr/medias/files/71055512454.pdf
    • http://sushiosushi.com/uploads/files/78651632361.pdf
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/luwevomuk.pdf
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136f84ab0413---japaxafurigutaw.pdf
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142376cbc644---54892119886.pdf
    • http://marcus-1.com/FileData/ckfinder/files/20210907_E231291236DF1269.pdf
    • https://nguoixunghekiev.vn/userfiles/file/24145211051.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=tamilrockers+john+wick+3
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d02d.bin
879393623724d2e580be9db54e2e9351e09ca7784b737ccc9e2fb01e7d715466
pdf-font-stream PDF embedded font (sfnt) at offset 0xD02D 10840 bytes
font_01_sfnt_off0000e907.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE907 16792 bytes
font_02_sfnt_off00010119.bin
3d5f65fb0d22c0e6c2b0624c04331460ee612c13ae53a961844d5be162a46af2
pdf-font-stream PDF embedded font (sfnt) at offset 0x10119 19156 bytes