Malicious PDF — malware analysis report

Static analysis result for SHA-256 964e5d260bfe49e6…

MALICIOUS

PDF

82.5 KB Created: 2021-09-05 09:36:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 193808daf730e122825e8c515c327190 SHA-1: 57096a631b6885555b7a28beff4b20e0f3c3686d SHA-256: 964e5d260bfe49e61fb57679bbcb72a343b53bc357e1a46f1151fa1498957af6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which appear to be hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this. No scripts were extracted, but the overall structure and URL patterns indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://pistant.ru/uplcv?utm_term=designed+by+apple+in+california+book+pdf+free+download PDF link annotation
    • https://langumeistras.lt/i/File/472900301.pdfIn PDF document text
    • https://bushregenerators.com/userfiles/files/zarevomenurafit.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0543450f73---67902851867.pdfIn PDF document text
    • http://urgentcarepb.net/userfiles/file/pibulido.pdfIn PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/64s7o7ir8pbe4mdmrk79rou6u5/ranidusedokidevarelawu.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/1485592473.pdfIn PDF document text
    • https://comobrew.com/newsite/images/user_uploads/file/15590445087.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/19788526159.pdfIn PDF document text
    • http://zonweringnederland.com/ckfinder/userfiles/files/dorefor.pdfIn PDF document text
    • http://contrast.no/ckfinder/userfiles/files/kajusuxoruvidivon.pdfIn PDF document text
    • https://abicecream.ru/ckfinder/userfiles/files/86780307323.pdfIn PDF document text
    • https://collegemahan.ir/basefile/collegemahanir/files/dukidisokorita.pdfIn PDF document text
    • https://goldfieldssanddrags.com.au/ckfinder/userfiles/files/33235360128.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/6b93c27c3988be21dcb6114adfebbad1/tilidazedajufixov.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160f03f31dcd10---14803774663.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/5dc18ce999e15538e5bf08c87d2b1b31/89222328323.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/83549043270.pdfIn PDF document text
    • http://tykhestudiodesigns.com/clients/7/73/7311521ca682816632878891c231d107/File/50001133855.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/54764190759.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160feacbf38465---13270702121.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/nq2b3e51fr70tbp5393n0r3jck/87258807091.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/kb61e32fsece5vf9lmtqblbq5c/856537373.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/89015342408.pdfIn PDF document text
    • http://attlas.center/userfiles/file/84901118596.pdfIn PDF document text
    • https://baruipur.org/ckfinder/userfiles/files/tilitikomerulavezutikatat.pdfIn PDF document text
    • http://nutricion-intravenosa.com/wp-content/plugins/super-forms/uploads/php/files/134a3173a388032084d5f2412032758b/23274601935.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_off0000db7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f394.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF394 11132 bytes
SHA-256: ae6323939017b0b7c9699ff876c95db55ada49e9f73c3057e91be7ba7f2accba
font_02_sfnt_off00010d57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D57 17924 bytes
SHA-256: 2ff331c365317b4ad4cb4798a54347659d9e2e896815843cc0b419311d728deb

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