Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3f6fc9c389612f0…

MALICIOUS

PDF

81.2 KB Created: 2021-09-23 22:31:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 139968849cb5a842e336a5c443ee7db4 SHA-1: 0f812c789d716385c51e9aba1eb8ad632ac6f86c SHA-256: e3f6fc9c389612f0d16ff4ad03dfe7533cf4d7b4d4a1e634b9d5b1bcd5ac3290
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a deliberate attempt to create a link farm. The embedded JavaScript likely facilitates redirection or further malicious activity, contributing to a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://sogelec-eng.com/files/ckfinder/files/diniwa.pdf In PDF document text
    • https://xn--pssa17sw71b.tw/upimages/files/dipalageverirokevan.pdfIn PDF document text
    • http://speckrepej.com/upload/file/giremimeru.pdfIn PDF document text
    • https://e-motorcycle.tw/upload/emotorcycle/files/29332328477.pdfIn PDF document text
    • http://miminku4.com/contents/files/jejaxoses.pdfIn PDF document text
    • http://khautrangkhangviet.com/upload/img/files/11213881970.pdfIn PDF document text
    • http://happyhanool.com/ckupload/files/gazukefaninonek.pdfIn PDF document text
    • https://codefon.hu/js/ckfinder/userfiles/files/79030446733.pdfIn PDF document text
    • https://retta-bg.com/userfiles/xotopufuvazudovogufe.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141f19891e16---nukevogetamagixer.pdfIn PDF document text
    • https://baoholaodong24.baohohoanglong.com/userfiles/file/62917541835.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614826bfd4ffc---81802740729.pdfIn PDF document text
    • http://ambvet-trefontane.eu/userfiles/files/84704434486.pdfIn PDF document text
    • http://fcraregistration.com/UploadedData/file/towifetatavapogoja.pdfIn PDF document text
    • https://songod.vn/uploads/image/files/9230833332.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/4210966a6df23e41ceb5be3466a7b747/18366016404.pdfIn PDF document text
    • http://lonniestireandauto.com/nbloom/fckuploads/file/sijexakulaxuve.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130d3016dfaa---79838200613.pdfIn PDF document text
    • http://agisinfo.ru/uploads/content/files/manemozagajefajiwejoli.pdfIn PDF document text
    • http://italy-ex.com/images/blog/file/ruladuvowiririweletamuk.pdfIn PDF document text
    • https://insolite.lu/img/userfiles/files/50178795561.pdfIn PDF document text
    • https://cfacgroup.com/uploads/FCK_files/file/70031960733.pdfIn PDF document text
    • http://express-service-auto.fr/ckeditor/ckfinder/userfiles/files/bujabezibuzerukiri.pdfIn PDF document text
    • http://word.mn/uploads/assets/35301959488.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/57468801461.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=undead+slayer+2+mod+apk+offlinePDF 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_off0000d71e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD71E 17744 bytes
SHA-256: c707f500ee7461848790b265a3e116df3d1f9a937dc8842d1c2dffdf147898a1
font_01_sfnt_off00010597.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10597 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011dae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DAE 10896 bytes
SHA-256: 7f4011a379bbfb378c2cd9f62281ab7949fb646e3151f157648a8b6f97f06f03

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