Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5080c0a223285e4…

MALICIOUS

PDF

96.0 KB Created: 2021-07-24 22:29:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b18f7b5891f44852b6a86ead782496e1 SHA-1: f92800b47afce0375ab658a88eeb4610c9918a75 SHA-256: d5080c0a223285e43633a52835c8038287a81f3daa2db9440569fa9f715a2795
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It contains numerous links pointing to compromised WordPress upload storage and disposable hosting, characteristic of a link farm used to distribute malicious content or phish for information. The document body is heavily obfuscated and unreadable, suggesting it is not intended for direct user interaction but rather to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c205a434ce---sipixurewutaj.pdf In PDF document text
    • http://spearsyounglegacy.com/clients/b/b2/b2c23f164518415ec8f3c1c8d0af542d/File/rogiz.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/u7bpj5fmkcic8n0smeqf4lgpvp/51042249587.pdfIn PDF document text
    • http://grandp.ru/userfiles/file/gogulujolojil.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a441872bf6d---remosakopa.pdfIn PDF document text
    • https://wineart.online/userfiles/file/juwibetofajisakabaler.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/sivugobu.pdfIn PDF document text
    • https://vasantviharproperties.com/userfiles/file/tagisimegow.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/b98490h61p3o7qt0ep7kin7qh5/sevipajovowefevovujagamoz.pdfIn PDF document text
    • http://gleneaglehoa.org/images/file/69155204507.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/xalogalesuwikitarivewu.pdfIn PDF document text
    • https://twfern.org/upload/ckfinder_temp/files/20210529013422.pdfIn PDF document text
    • http://bsbcarpet.com/userfiles/file/26734792776.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/d72350422a6213ede5fc931bfdedf44e/buterirosomijet.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/86bb035f7a96c152d9fe1389e091b657/rejadumax.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/16096b9a69cf88---71750910797.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/2f47d8666e991c59436f0d0dc2bf6cfb/tebixet.pdfIn PDF document text
    • http://bobhendrix-law.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bedasuroxekomakunoraf.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b902d474354---rejobifej.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16076c928c05bd---88896999262.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160ab6ed3c363e---10074188021.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/f83df0889e6f4f6863f488113d3c5c9b/sinut.pdfIn PDF document text
    • http://maility.pl/_ADRESuserfiles/file/95475385844.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160980e8ef1be1---rapedamexikad.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c1f83d33c6---68664052939.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/27433634189.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/73286715206.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=what+is+the+highest+score+on+the+nha+phlebotomy+examPDF 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_off00010d3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001254c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1254C 19004 bytes
SHA-256: 41f78edb0b25ee471a782e1144620488e133dedbe125cc3177f7c7ba307b7dd5
font_02_sfnt_off0001570c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1570C 11172 bytes
SHA-256: 3e9bc04c6b95c782831452f963577f79fa85a98cb7966bd3ef55ab7d9df36bf7