Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a5099a0a84e0e69…

MALICIOUS

PDF

85.0 KB Created: 2021-09-18 19:56:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: f32b2896c0819a3ac0d3aa5df726b473 SHA-1: d744bf3ac7baa6cd16fae9d85b60814ec52308bf SHA-256: 5a5099a0a84e0e69213be37ac2f7bc96258f2aae507de7bb7a922193ca9f3bbc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as a phishing trojan. It contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. The document also features a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to distribute further malicious content or redirect users to phishing sites. The presence of embedded JavaScript indicates an intent to download and execute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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 http://7sate.com/filespath/files/20210909090302.pdf In PDF document text
    • https://funbugs.ie/userfiles/file/93909930141.pdfIn PDF document text
    • http://dhf-china.com/d/files/faruni.pdfIn PDF document text
    • https://galaxytraining.examinationonline.com/files/zilosuvenofokopodirerejof.pdfIn PDF document text
    • https://dialogueinpraxis.net/files/docs/bikezebolexujekasuzarusaj.pdfIn PDF document text
    • https://dcimx.com/files/51223828033.pdfIn PDF document text
    • http://madiagranitosilano.it/userfiles/files/gumipafokepisupen.pdfIn PDF document text
    • http://yjeverspeed.com/userfiles/file/tibevoruduw.pdfIn PDF document text
    • https://foundationkuzmanov.com/files/5465388967.pdfIn PDF document text
    • http://k-sta.kr/FileData/ckfinder/files/20210909_5DA1C3476E42CC19.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16142fcb44ff8b---bideduvotafiturotobimuna.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141d37bcc16a---jajolojoworunajetebu.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/9bnoo5lshtrjbguoi61v4ftbam/simabarewawiwopabezubawak.pdfIn PDF document text
    • http://lutechmed.com/Images_upload/files/tigutezedibilisifibekevu.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/suxaxemedivogafewerebul.pdfIn PDF document text
    • http://maysoi.com/hinhanh_fckeditor/file/84080840311.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/a6e7e726c3fcd4199c24377de8f9210b/faretadetuwowo.pdfIn PDF document text
    • http://herningbadintra.dk/app/webroot/upload/files/patedekadoritogamipateli.pdfIn PDF document text
    • https://reformedgeneration.com/userfiles/file/32386961621.pdfIn PDF document text
    • http://cuacuonductudong.com/upload/files/lesusi.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/8e779d26a22df044aad34a59084d1ced/16807953523.pdfIn PDF document text
    • http://tomei4x4.jp/js/upload/files/vebujuxewotufajaritu.pdfIn PDF document text
    • https://mmrh.myagenda.cz/pictures/editor/files/zifubud.pdfIn PDF document text
    • http://home-hj.com/up_photo/file/nukonubemudapotaxovuzajug.pdfIn PDF document text
    • http://royalgroup.at/tmp/wikogo.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/21595371504.pdfIn PDF document text
    • http://lasantitosrestaurant.com/userfiles/file/37495855654.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=how+to+delete+voicemail+app+on+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_off0000e71a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE71A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF31 10648 bytes
SHA-256: 330de54989c305ffc6a1c61fbe0112047c7229d93cbc62b9e79d193523d16d42
font_02_sfnt_off0001177f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1177F 17976 bytes
SHA-256: 5c0a6a44650741de5c9cf17f3c76cbd58dfe2faface1d556a557b3ca1def53d4

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