Malicious PDF — malware analysis report

Static analysis result for SHA-256 320fe94f1014df37…

MALICIOUS

PDF

91.0 KB Created: 2021-07-02 11:09:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e70e6d9a3b8ac65922b164643f8dd276 SHA-1: 228d5350de6ead0b52ab6121a0de107ddab13df2 SHA-256: 320fe94f1014df37969f831c8d1fc1b9551da4f4f8ca630e7aee083bce90d4b4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://fusheng-vietnam.vn/admin/webroot/upload/image/files/gonofomuzulabuxobujogiv.pdf In PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160812ba24c4f5---31038698529.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f2077e6d55---vedawuleziwisuto.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/dfk61cf6fe73fnrv73s8uhavn4/fopikimososuxexipul.pdfIn PDF document text
    • https://akproauto.net/nbloom/fckuploads/file/52593793690.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606d55ff705c0---20818702793.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b5c54c59ce2---zigozamowabotekodiwa.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608adb5896d86---62377007819.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/6cb87e8ce5465e6bc920efa6236980d1/fuzagufufuwutibaborobemo.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/4329ee1689c48aca378f07e73165e975/15231407115.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/48431824085.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/goatkr4ghircnluem59r3ih4b6/ruxukop.pdfIn PDF document text
    • http://vaness-sens.fr/ckfinder/userfiles/files/51319982435.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da7d0028cf1---puzawawexere.pdfIn PDF document text
    • https://bwawarszawa.pl/upload/file/tabigibubogosumebenavuru.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c14ffe6b5d---75847044731.pdfIn PDF document text
    • http://betaempire.com/uploads/userfiles/file/file/42767336835.pdfIn PDF document text
    • https://kawanmto.info/contents//files/48773312647.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/b04c3ad88f8589b1bb3f2b70c34901dd/24523192859.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/vafanelelux.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/363b8cpsvrc5dljn6l32088c1h/35503393505.pdfIn PDF document text
    • http://formel1vermietung.de/userfiles/file/15604396858.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160960462002db---fezovam.pdfIn PDF document text
    • http://aj-logistics.com/stock/userfiles/file/tifiriko.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=best+traditional+tomahawkPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/512c0279eeb1e204bdc6ffdc7c2249bc/24194729271.pdfIn PDF document text
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/a38dcf4a6bcf93ff4db7e02b9c085bb0/wasipavoso.pdfIn PDF document text
    • 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_off00010265.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10265 16772 bytes
SHA-256: 6aa9e109f097b792f6ea1ca9e1fa7de3f12c7664a840f2d799c321a6bd037d9d
font_01_sfnt_off00012dd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DD2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000145e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145E9 10744 bytes
SHA-256: 0a91c83d10dee3909cbfee2528443ca392a8897c67104037cd60a7c17e7eb1dc