Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfd0aa242911a41d…

MALICIOUS

PDF

84.6 KB Created: 2021-08-16 20:15:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ed8188280ae3f20046430704d32f9c52 SHA-1: 781f0f53dfc1af24459348cbeb64f7a9c636c798 SHA-256: cfd0aa242911a41de60404fb711bc0685ef54bd888c750342e9e9d2bffbf894b
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised WordPress upload directories and disposable domains, indicating a link farm designed to host malicious content or phishing pages. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://steammining.com/userfiles/file/mebinoxigejabika.pdf In PDF document text
    • http://calisnt.com/uploads/files/jalotunalojunokodibop.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/g00mrpsioqtbdgqvodel4903k9/80778476305.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/vkbgtkhsmnnv54na1rjbebp7p3/vatometatofugoropotid.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/104g5ila3v3jv6c41ql86q8bea/27710723015.pdfIn PDF document text
    • http://scandirent-new.ru/uploads/assets/file/ruwafolubavosevasolane.pdfIn PDF document text
    • http://emilymillerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/25168927931.pdfIn PDF document text
    • http://climtech.com/files/files/werubulu.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a599ed8fc59---surezivegexomawag.pdfIn PDF document text
    • http://areawifi.com/DESARROLLO/userfiles/files/lagagofo.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/fbfd4993c8d6f35795f279be479a8618/67542333700.pdfIn PDF document text
    • http://citysuji.com/ckfinder/userfiles/files/voduxazu.pdfIn PDF document text
    • http://saltyfeelings.com/userfiles/file/bikuvomerolosefeguxolamul.pdfIn PDF document text
    • http://goldcoil.com/uploadfiles/files/pikagisoguwuxomubixajuje.pdfIn PDF document text
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/53953155084.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160794c7fdb796---bolevezizarenotesa.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/b2a7f6ff04a0bb0297166e46d0e487ca/wokegoxawerazobirew.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160cc385a2353d---gadiwejijixaxun.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/41333415113.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/baa7e779f51bb1f497689f29ad839ceb/paxafubobima.pdfIn PDF document text
    • http://eia-edu.com/userfiles/file/3723820026.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/7qg2ihffa1ikf5ggd0fetqj3sa/88433806678.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=geometric+terminology+crossword+puzzle+milliken+publishing+company+answersPDF 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_off0000e3d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fbed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBED 11592 bytes
SHA-256: cf525bdd7a7ea9767d397d995f951f7d0ded7a5efb2a0cd99843800d4bda0ac4
font_02_sfnt_off000116f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116F8 17452 bytes
SHA-256: 8702266cb1b731d88ce9d5f13c6bbc4a7923ad5cc641567149a7199cbd1683cd

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