Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae84708780b5f23b…

MALICIOUS

PDF

84.0 KB Created: 2021-09-17 07:30:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: b905014e91d13362f32bd2dc4b3b8144 SHA-1: 4d44ed233bf395061f2fc5261e6c698cbe2ba3a4 SHA-256: ae84708780b5f23b606abff2beebc660517cc7e9d2cca8c65363bdb261e9964e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, forming a link farm. The presence of a 'download' lure and ClamAV detection as Pdf.Phishing.Trojan strongly suggests a phishing or malware distribution attempt. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://synerhu.ru/uplcv?utm_term=how+to+download+vidman+on+firestick PDF link annotation
    • https://101doctor.com/uploads/ckfiles/files/6138e29201489.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/16141eb5e5a1c1---zatimaladutetoxamixekesu.pdfIn PDF document text
    • http://jfhconsultancy.nl/userfiles/files/46884300854.pdfIn PDF document text
    • http://vntattoosupply.net/uploads/image/files/86144978269.pdfIn PDF document text
    • https://rjpexport.com/files/jomedomobudata.pdfIn PDF document text
    • http://taikenplan.jp/ckfinder/userfiles/files/53194979653.pdfIn PDF document text
    • http://csc-021.com/userfiles/file/20210901195438_4fixpz.pdfIn PDF document text
    • http://vasekurzy.cz/userfiles/file/85521061546.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/56325a512c175bb4ad51bc4040c9141c/78246413351.pdfIn PDF document text
    • http://pribatu.lamilagrosaimport.com/images/files/82464969876.pdfIn PDF document text
    • https://hunde-katzen.at/soubory/14836638878.pdfIn PDF document text
    • https://royal-art.pl/uploads/userfiles/files/41928083538.pdfIn PDF document text
    • http://parmalab.it/userfiles/files/fusosepotesus.pdfIn PDF document text
    • http://ambulatorioveterinariomariani.it/userfiles/files/rabumaxisa.pdfIn PDF document text
    • https://totspotdaynursery.co.uk/ckfinder/userfiles/files/notimemidejofexasafep.pdfIn PDF document text
    • http://csc-028.com/userfiles/file/20210908145933_h8hvzx.pdfIn PDF document text
    • https://bakwanudang.com/contents/files/zimuri.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/30d82f2034a27036682b49fea80e4e0e/deporowenifi.pdfIn PDF document text
    • http://kasaitogo.com/uploads/files/5857833810.pdfIn PDF document text
    • http://ranaghatpchsschool.org/userfiles/file/46501877372.pdfIn PDF document text
    • https://psihodesk.ro/ckfinder/userfiles/files/zibaba.pdfIn PDF document text
    • https://sowlindia.com/userfiles/file/51482971335.pdfIn PDF document text
    • http://studiocinti.eu/userfiles/files/63147691678.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_off0000e12b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE12B 10872 bytes
SHA-256: 44ad2c41de0ee261bfc4c126741ff932659ac831a1d8fe0183255ef5e3c2edcf
font_01_sfnt_off0000fa4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA4E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011260.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11260 18220 bytes
SHA-256: ad548d880df8830762aa744402d7e67538ea0403857dba711db0aec770750379

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