Malicious PDF — malware analysis report

Static analysis result for SHA-256 7758fb948ee15438…

MALICIOUS

PDF

89.3 KB Created: 2021-07-31 00:18:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5d05738bb54aeaf620a951b67395e350 SHA-1: e77af404e3ab9598232396fcc6ab4e030d7189fd SHA-256: 7758fb948ee154383a020c17945a53a0934c20b5f2826a058c47d70dea0bf4a7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress uploads and disposable hosting, suggesting a link farm designed to distribute malicious content. The presence of a visual download button further supports a lure-based attack. ClamAV detection and ML classification confirm the malicious nature of the file, likely a phishing or malware distribution document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://inwebjor.ru/uplcv?utm_term=unlock+icloud+generator+v1.0+free+download PDF link annotation
    • http://fouladsazanco.com/Upload/file/86894920327.pdfIn PDF document text
    • https://p99.tw/pro_pic/files/kaxukazovudar.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cadb207c33---59712385877.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef5fce961e---lewit.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5ac204a88a---3116929480.pdfIn PDF document text
    • http://dlikefulproductions.com/clients/875850/File/41229891975.pdfIn PDF document text
    • https://postelezmasivu-liberec.cz/ckfinder/userfiles/files/tanenojifobudasola.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/8fe03ad734c4b3a9ce7da1fdf0375a0c/lagigivipuzo.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/1u31c73vvqqclen9qsavml6v15/98711568752.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/29708405219.pdfIn PDF document text
    • https://kurtoglumob.com/upload/file/woxif.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/uzidafun.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/jesadavefagipuwejaxew.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/873203f542a67c00448986b8eb903a80/35516781600.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/fitixajige.pdfIn PDF document text
    • http://www.nachtruhe.info/up/files/sufulujebamovegipigilu.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/pc1261q5ncd19op2m07885nb94/tasubudajuji.pdfIn PDF document text
    • http://mmbc.cz/_data/user_files/file/jonorozesewusanoze.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606da76eb4ec8---geruwovexoxo.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071f4bab3d88---vizebawaxulidorugoj.pdfIn PDF document text
    • http://miwon.com.vn/app/webroot/uploads/files/gutet.pdfIn PDF document text
    • http://bugskin.org/userfiles/file/22077823334.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607f75bd240a4---2797507736.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/zazugezizixo.pdfIn PDF document text
    • 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_off0000f41f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF41F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C36 11076 bytes
SHA-256: a98ae960037421ce22fc9b3f32a30ed5298d34b0d6b0e5d9e988b0f7ffa07f4e
font_02_sfnt_off00012603.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12603 17744 bytes
SHA-256: 786eb9b181e0a091ca6a0e86101c711285bdbc2e67c9b23ce360e51850a9e597