Malicious PDF — malware analysis report

Static analysis result for SHA-256 91477e3fa2d48650…

MALICIOUS

PDF

78.4 KB Created: 2021-07-13 19:32:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 71dc72c7e80901882b378dc36cde8f76 SHA-1: f232158c65f39d7719b7b3df2c9a7cce3d1dea8c SHA-256: 91477e3fa2d4865016873b4b2e4b7fb480227cf8374c00fed1496ffaaf4b8766
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, containing numerous URLs that point to various websites, some of which are hosted on compromised CMS upload directories. The presence of these links suggests an attempt to direct users to potentially malicious content or phishing sites.

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://anatolianlgs.com/userfiles/file/buvoligatawovukag.pdf In PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/dilapiroxubevu.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160966f2cc1812---bewatunagekajigofe.pdfIn PDF document text
    • http://zakuskymoser.cz/www/ckfinder/userfiles/files/64821820438.pdfIn PDF document text
    • http://yummyschool.com/_UploadFile/Images/file/22279563264.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/ca2922920fc86d3078bb535e65a3d86f/bakuxurofagesanitutusawaw.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/23cd09b0c39808d1b83664754468df10/fenuv.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608989bb3f367---zixetewiwa.pdfIn PDF document text
    • http://aweibel.com/Photo/file/pebinafijegajewafaboj.pdfIn PDF document text
    • http://www.oneworldkarate.com/fckeditorimages/userfiles/file/33176901215.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/5c8adce487bd46ab798f4e6992ec2993/zuserixum.pdfIn PDF document text
    • https://mimpi1pusat.com/contents//files/81872148468.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609d2da615235---dusosoke.pdfIn PDF document text
    • http://rencontres-icare.org/userfiles/file/lutividuwob.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160843f5024064---67470531833.pdfIn PDF document text
    • http://cuacuondaiphuc.vn/upload/files/22468414968.pdfIn PDF document text
    • http://e-cluny.cz/UserFiles/file/jazunanef.pdfIn PDF document text
    • https://parfumzone.ro/files/file/28834177245.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/645a4fc0576a9ffae56fa21b2ae69499/90685011566.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082d31f07fd0---96026762641.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074f92615386---toxipelefadowuvigeba.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/0o5j994e0ja5ip3p36b63p9875/tejamovitex.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160722c2469877---21235916723.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/wopuzuxusexagavukuzovalik.pdfIn PDF document text
    • http://ciaooo.ru/uploades/userfiles/file/zekowigodomowuvagoxi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=easy+steps+to+chinese+workbook+1+pdf+free+downloadPDF 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_off0000cb01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB01 11184 bytes
SHA-256: c265ff971c759225575f3a83a5bf5e0265f1af71c96afa5de69fc6f507b2c6e4
font_01_sfnt_off0000e501.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE501 17644 bytes
SHA-256: 3f63d462a8bbb5e2fc5d9c38ae7b0c6024160e9c4934b0481a69a66701166223
font_02_sfnt_off000111e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1