Malicious PDF — malware analysis report

Static analysis result for SHA-256 70477eb91a864d34…

MALICIOUS

PDF

87.8 KB Created: 2021-07-24 01:17:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: abd062bf9b59ec1b8803e9e5e7afa75a SHA-1: 6f55f8f20e4a08ed1788f613e7d24a27f0691558 SHA-256: 70477eb91a864d34d9d3040138493b37292a576907c6bff23896df2947c03aca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The document contains a link farm with numerous URLs pointing to compromised WordPress upload directories and other disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of external URIs and a link farm on compromised CMS uploads strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/e5dc6cb88ea0c0af684c2fc41a2d216e/11113395616.pdf In PDF document text
    • http://autosklo.sk/pictures/file/jugitusoxofa.pdfIn PDF document text
    • http://yejida.com/userfiles/file/zumibez.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608171a2bcdbc---56289287564.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/92069079944.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/9d703109c881377eb4cac89da93f044d/88907209765.pdfIn PDF document text
    • http://vendingchat.ru/uploads/ckfinder/files/tulesazutizokasa.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/c3e1c02822dcdf4c51fe7d907a52d2d2/lususi.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/1c9c0ad2853f12c84f32fd1cf3f893a1/8069837700.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d7d809579b---rewetovepexanebusofuvage.pdfIn PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/v6nvantob62umo15str3tt09a4/51453254137.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/4006a82409d7a65741456704ab707e5f/givujut.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160868c2462a32---vubojogonutasopegopakil.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4242a2d4e---8944114690.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/lodifuxurevo.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160952da9ab23b---6013338040.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/ce5d92bb7a36ab750bd1fedb08691f8b/bisapesezisozukazof.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/0ce258fbe0845d2431f520df950d22a6/lemokibigejapominokax.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/67483607772.pdfIn PDF document text
    • http://dailymaydemtien.com/userfiles/files/8857590399.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/lkmu8daa84qb0icctrtvkvc8cv/magunura.pdfIn PDF document text
    • https://dp-engineers.com/admin/userfiles/file/manukuvub.pdfIn PDF document text
    • http://akademibt.com/resimler/files/11982654828.pdfIn PDF document text
    • http://jeremypourstarlight.com/clients/5/53/539822683240d2210db56c0084569a8b/File/gejexefatijijav.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d503cd8eb---nupazu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=download+piano+learning+book+pdfPDF 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_off0000f1c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C6 10724 bytes
SHA-256: ef0fe2338865330a680389e919d31f6aaa9049564ca1c9d05148f22814733c6e
font_01_sfnt_off00010a13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012225.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12225 17744 bytes
SHA-256: f625754fc5b10b8a8f6b03001e82692e04ca6a225c50915db560fc0258229847