Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9679f0829452748…

MALICIOUS

PDF

80.1 KB Created: 2021-08-31 11:52:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: dd47c04036cfd1aeb9afe989e8942051 SHA-1: db70779d3a5400489c4545c6c9c575dbafeb4492 SHA-256: f9679f0829452748d109e371d1c0bd5856b0a939950d2651cc41b80f5975f63a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV, indicating it is likely a phishing or trojan delivery mechanism. It contains a link farm pointing to various domains, some of which are hosted on compromised CMS upload storage, suggesting an attempt to obscure the final malicious destination. The document body is unreadable, but the presence of numerous external links and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a lure to external, potentially malicious, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://theatresaucinema.fr/uploads/file/85869287039.pdf In PDF document text
    • https://mo-space.space/web/img/podborky/files/zipinuz.pdfIn PDF document text
    • https://osikovo.eu/webroot/img/content/files/19221790225.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa1c034245a---bawotitusazetife.pdfIn PDF document text
    • http://hy-concrete.ru/d/files/jakabanekivun.pdfIn PDF document text
    • http://dnepropress.net/files/file/89792770125.pdfIn PDF document text
    • https://sinarwaja.com/account/files/18222823696.pdfIn PDF document text
    • http://x04ydivan.ru/userfiles/file/19717403093.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/a366f83ad1ae9e1f568c7f87bfd6d5b5/pawekarujuwizupiguw.pdfIn PDF document text
    • https://btcauction.vn/hinhanh/file/13037967621.pdfIn PDF document text
    • http://nurugelexport.com/ckfinder/userfiles/files/powefidezupizuwuje.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c4d6a3713db---kogipapovikofofitadaba.pdfIn PDF document text
    • http://zerosquareonline.com/file/66749121755.pdfIn PDF document text
    • https://www.terraton.com.my/ckfinder/userfiles/files/kuruxajafudiguj.pdfIn PDF document text
    • https://camelcarpet.org/d/files/78894876279.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/199945340fbf59c56cdb7d2e474ea6a2/jemepoli.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/54764453772.pdfIn PDF document text
    • http://lyzebrno.cz/userfiles/file/44966488258.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/a4d34546e7c4decd6adac5a5c528cd07/bovafisufano.pdfIn PDF document text
    • http://talk200.com/admin/admin/uploadfiles/file/65464448454.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608477958253d---wokesatorupawetolo.pdfIn PDF document text
    • http://hainfelderteich.at/31822060463.pdfIn PDF document text
    • http://0vote.com/ckfinder/files/donobudozusotevarajiniga.pdfIn PDF document text
    • http://www.biharikft.hu/bihari-admin/ckfinder/userfiles/files/xiruva.pdfIn PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/befbb320d3778e8e049544ca3c0d06d1/9880440288.pdfIn PDF document text
    • https://confidence-ist.com/ckfinder/userfiles/files/xetuworejol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=new+one+piece+english+dub+release+datePDF 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_off0000d00b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD00B 11096 bytes
SHA-256: 30a6ed67ce02faf7a3169b04dfe88a4ff07740cba18436ad202b4d7507b75a15
font_01_sfnt_off0000e974.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE974 18556 bytes
SHA-256: c1a820c65cbd934c455bcc6b0e9b82c505fb73e52e56279dc99774d0904918fc
font_02_sfnt_off00011a03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1