Malicious PDF — malware analysis report

Static analysis result for SHA-256 36502372b8d87cec…

MALICIOUS

PDF

87.3 KB Created: 2021-07-03 09:45:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 5c8bcc4d18def1c1c9ad8345366aeeaf SHA-1: 209dd286065fbe1c89007ceaf0f4abb33f366f86 SHA-256: 36502372b8d87cec8bfa1b313d88b6e1895957990a72d073597196f1b8d3ce57
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and a machine learning classifier. It contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a pattern of distributing malicious links within the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://chcial.ru/uplcv?utm_term=height+and+weight+chart+of+girls PDF link annotation
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16076fb00a8b2a---fulixoj.pdfIn PDF document text
    • http://windmill-bv.com/userfiles/files/puvorapomi.pdfIn PDF document text
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/dngp4c9m9769q8k9k47as1940c/jugagukelalenow.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/6efad2afb2b9baa2048a7be3b891c2f3/2833302495.pdfIn PDF document text
    • https://triosms.com/userfiles/file/14621527181.pdfIn PDF document text
    • https://qpshouse.com/upload/image/file/58765988711.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074d8042344c---talejiwimovapazoleri.pdfIn PDF document text
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/80193824114.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b756ec208---71900575135.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/16091fb9e47710---levopanejipug.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/2fe0d9090eff987308252ca0af5ae8cb/64232213421.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609439a9105d0---64979067040.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079f2d8a16dd---60353707067.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b24b8ae3b2e---11612728524.pdfIn PDF document text
    • http://tktravel.shop/FileData/ckfinder/files/20210602_5022AC248A7DF89C.pdfIn PDF document text
    • http://tykhestudiodesigns.com/clients/7/73/7311521ca682816632878891c231d107/File/jibiripasevoki.pdfIn PDF document text
    • https://smilepaper.tw/archive/upload/files/27285654124.pdfIn PDF document text
    • http://dpsszczytno.pl/photo/file/xabonatomuvoxuwevizix.pdfIn PDF document text
    • http://zhouzhuank.com/v15/Upload/file/2021625415589578.pdfIn PDF document text
    • http://www.logomarcanet.com/userfiles/file/kaniserinamebedinazetemi.pdfIn PDF document text
    • https://hfdjet.com/wp-content/plugins/super-forms/uploads/php/files/c5c132ded772e8554cca899b8583be6b/vukijimu.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/1f1e59be2c16e85eb315d733b3903bfe/ziwefowabufot.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_off0000f339.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF339 10832 bytes
SHA-256: b2553048860077f174fadae9ab2d46cfd4386dfd564cf5ac82d9121ec53a210e
font_01_sfnt_off00010bf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF8 17056 bytes
SHA-256: b0bc0652005e67286b6a5d1ceb6760747bf40abb21161713df84a205d8ed7466
font_02_sfnt_off00013819.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13819 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.