Malicious PDF — malware analysis report

Static analysis result for SHA-256 221a4368302cf474…

MALICIOUS

PDF

84.9 KB Created: 2021-08-22 04:21:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e84432597fac3dd48523b263bc00d043 SHA-1: 527d204e6aafe4382e7f340d999c85ad93e9a7e9 SHA-256: 221a4368302cf4741d1f11e11e1c5cb74ddc5f984c285b9ee746a5ebeca0e956
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains numerous external URIs and links, many pointing to compromised CMS upload directories or disposable hosting, indicating a link farm or phishing lure. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://mazdooradda.com/userfiles/file/53475091631.pdf In PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/39945450bff40747c936a1d1dfe904ea/24721623213.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1608fc919b42cd---jabamotinilo.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/5971c2aced8cbc6675eb8a8fcd3ff083/wuvepanefubugusolazora.pdfIn PDF document text
    • https://xn--80afc2apd5n.xn--j1amh/upload/files/fufofogosigegu.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/0fe0q8i7qbhsbphne7lvuaashj/56227973604.pdfIn PDF document text
    • https://2b3la571ga-70p.com/contents/files/18723197182.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c86e650556c---2524789598.pdfIn PDF document text
    • http://ibb-online.ru/f/file/foxufefagugexewoma.pdfIn PDF document text
    • http://sicilalluminio.it/userfiles/files/fojuvinukifelu.pdfIn PDF document text
    • http://jandenzobv.com/image_uploads/file/9806675396.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160809e415109e---82287549229.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160875be8670f1---48618454000.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/4be18fc21d23d99096a6a3a91ae9d56e/12439329270.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b2884cf3b1---11997894988.pdfIn PDF document text
    • http://regimhotelierbucuresti.com/images/userfiles/fujirerivel.pdfIn PDF document text
    • http://valeneighbors.com/userimages/wafogomimiredakolupev.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/beb0722d17ca2fc9e931767f7548f0d3/80773364610.pdfIn PDF document text
    • http://alexandraharris.com/clients/36054/File/zomapiruragenulujowumufe.pdfIn PDF document text
    • https://netkat.in/ckfinder/userfiles/files/34831364372.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/13f6dd3ffedacfd67de34863b1114d2d/fixasomigesi.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e61d0d7cea---27565270193.pdfIn PDF document text
    • https://listapp.in/ci/userfiles/files/denopimipibiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=media+mediana+e+moda+exercicios+resolvidos+8+ano+pdfPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/286dec75609acc5d61e9698578872374/rofopoxud.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_off0000e106.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE106 19292 bytes
SHA-256: 75829b591e43be87d69fcc06cc82491398d967bb97301a10938c9785f6f8efbb
font_01_sfnt_off000110ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110AE 11052 bytes
SHA-256: 378a8890e4e539e4812a23f9f6476a3acc97e18308d4fac37fb88d739d2bcc38
font_02_sfnt_off00012a67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1