Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b3e94b5f10947b8…

MALICIOUS

PDF

133.8 KB Created: 2021-07-01 18:44:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: c01c257607d432c81a6726fbbd6ded6e SHA-1: dcd713b1dc83ae8620737e7c964a61754f27b951 SHA-256: 0b3e94b5f10947b8a6da66705f32adb83554800496ffe399082acbdc86d1442e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/acb12b582b15013628b61b0bfa591ba3/bedixofuva.pdf In PDF document text
    • http://argyleliquidations.com/userfiles/files/nibuzonokusewujeri.pdfIn PDF document text
    • http://simkoongschool.com/uploads/editer/files/tasuxa.pdfIn PDF document text
    • http://ketnoikienthuc.com/upload/files/65796703631.pdfIn PDF document text
    • http://em-mould.com/ckfinder/userfiles/files/39369338817.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/logerosebusidafigum.pdfIn PDF document text
    • http://homespakistan.net/magzine/uploadfiles/file/78246323223.pdfIn PDF document text
    • https://coevent.ru/upload/files/10050845654.pdfIn PDF document text
    • http://ngor2-3.com/file_media/file_image/file/tugisatasir.pdfIn PDF document text
    • http://otoozevran.com/resimler/files/82845493875.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/lcm6tq7cvnde787jfb2oj3qcve/misagoteravi.pdfIn PDF document text
    • https://gamedunyasi.com/calisma2/files/uploads/jumepe.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/7f063c054891903e3ef287c3f2ee8dd3/wevebagizosi.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1210b9b7e---vujilis.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/27088a0b2f4dc9cd7120e307e9f8b754/vogeviza.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/08181208f30b643c28f4b79a57cc2f89/53054293556.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/lalogedujogubakifuposarog.pdfIn PDF document text
    • https://hanmarklight.com/UploadFile/files/pakuretoduzoruzofabuxifox.pdfIn PDF document text
    • http://fitviewer.de/files/file/rugika.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/e91fd49e7fded21f882f0ece89435d72/wukojexefawuxefopomu.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7394ee929c---55692871767.pdfIn PDF document text
    • http://chromavials.com/d/files/67754390299.pdfIn PDF document text
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/8e28b01f9dd39c75aae6c0f31d20acf8/53179331517.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b6bf2ceb3---kizatefaxisapexafox.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f60a9898a1---78440660612.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=we+made+a+deal+ages+ago+sex+and+the+city+quotePDF 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://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_off0001ac2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AC2F 11172 bytes
SHA-256: 5faa7129fb2f5d6145daf81042e1d71e720e18a8f8c0b1344c2ce7cfb408f1ce
font_01_sfnt_off0001c599.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C599 18072 bytes
SHA-256: cb1a2a42ea021ff30fccf08bcd1a72bf74d51e93d85daeacac08aeda7b3835b8
font_02_sfnt_off0001f4ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F4CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1