Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd059491d1b6c948…

MALICIOUS

PDF

75.7 KB Created: 2021-09-10 03:48:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 75f94e34cb4008046a72c308024fd7f3 SHA-1: 4cd16c65030a0859cebd0129c7e36dcbdb4e1ce9 SHA-256: fd059491d1b6c9485c8469f814f211893079c2ec60a5282840aa25cffd1f4c3c
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 0.9908

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://rijst.nu/userfiles/file/xalupobu.pdf In PDF document text
    • http://ajk-opakowania.eu/upload/fck/file/37368992285.pdfIn PDF document text
    • http://mevlanaasm.com/resimler/files/sijas.pdfIn PDF document text
    • https://taxfirma.com/userfiles/file/5751021533.pdfIn PDF document text
    • https://tele-video.ru/upload/files/wirefupupunonotizupezef.pdfIn PDF document text
    • https://madhubanindiancuisine.com/nbloom/fckuploads/file/22351189694.pdfIn PDF document text
    • http://aviteksural.ru/admin/ckfinder/userfiles/files/kuwuluxemawenumexinur.pdfIn PDF document text
    • https://vietucmould.com/img-vietuc/files/11308342541.pdfIn PDF document text
    • https://tvsporedi.si/vsebina/varoselafexoz.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/62339888818.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/161328733baea4---73461080451.pdfIn PDF document text
    • http://studioambienteterritorio.it/userfiles/files/muramepavebal.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/072585742.pdfIn PDF document text
    • http://dwallacelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bogomuwivitulegu.pdfIn PDF document text
    • https://honkakuji.jp/honkakuji/images/ckfinder/files/venag.pdfIn PDF document text
    • http://cnsgawefgl.netsociality.com/upload/files/19157133526.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/t01tovpchtkd11s15o1gam9d92/30937421974.pdfIn PDF document text
    • http://onishi-kyosendo.jp/archive/83897639768.pdfIn PDF document text
    • http://vlajkylevne.cz/UserFiles/File/zalolu.pdfIn PDF document text
    • https://slezanie.eu/userfiles/file/wapeguvavemoxepifazarudiz.pdfIn PDF document text
    • http://sichera.eu/userfiles/files/kotod.pdfIn PDF document text
    • http://kutscher-customs.de/gfx/userfiles/files/rupimox.pdfIn PDF document text
    • https://pecintajp.com/contents/files/7128577704.pdfIn PDF document text
    • http://machinegroup.ru/img/outer/files/pomil.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613635aa57dcc---42028732694.pdfIn PDF document text
    • http://fotografoenricogiampieri.it/userfiles/files/97957142207.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=menghemat+baterai+androidPDF 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_off0000c5d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5D7 10612 bytes
SHA-256: c12a25fb0c0759edbada38013f4a1028f8ea567f6fa499305c21ab8f84110b85
font_01_sfnt_off0000dd9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD9A 17184 bytes
SHA-256: 5fd8d005e77c779ae26587664e182b5a1f5450c124eaea52a9aa2ce6a7cfcc4c
font_02_sfnt_off000108b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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