Malicious PDF — malware analysis report

Static analysis result for SHA-256 323a0acc4f37aae5…

MALICIOUS

PDF

83.8 KB Created: 2021-08-12 19:44:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7baf3e137cced292bd07dd0defeedfe9 SHA-1: 0ee4d794cbff1f2f534bc6387bc9f4f20daa3ab6 SHA-256: 323a0acc4f37aae54586e6b491e10c8e4c4b1c5027c40fc9062ba85d812aaab3
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It functions as a link farm, directing users to multiple compromised WordPress upload directories and other disposable hosting domains. The primary goal appears to be directing users to malicious content hosted on these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 http://bruningfoundation.com/clients/9/99/99acc79c432c4c389b364f5b25189af3/File/68998667798.pdf In PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/2b4c7bea75adea6b257ffd7e07be8dc3/jawam.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072803a7e231---88724568191.pdfIn PDF document text
    • http://hydrem.ru/images/file/kaxefudibofovivexikukuvil.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/6v1tfa0tncb76ll12pd4ernho0/14994010630.pdfIn PDF document text
    • https://hotellemaritime.com/hotel/upload/files/56858567558.pdfIn PDF document text
    • http://babijie.com/upload_fck/file/2021-8-10/20210810144208721963.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/1dffd9105b3f3775180b8b924a43b604/semeniwivasumuwivija.pdfIn PDF document text
    • https://samarthanamparisara.org/apadmin/uploads/userfiles/files/36268297949.pdfIn PDF document text
    • http://poongdung.com/FileData/ckfinder/files/20210810_66F005BB6942393D.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/846f801a7bdd1d011b8e73533a548616/2783703193.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d5068a432cd---1215498772.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094961b24e98---2045481040.pdfIn PDF document text
    • http://kehlux.lu/userfiles/files/54091728097.pdfIn PDF document text
    • http://moscowprice.com/content/xuploadimages/file/wozunowemositegeb.pdfIn PDF document text
    • http://appletechsolutions.com/userfiles/file/79170552810.pdfIn PDF document text
    • http://xn--l3cbpp3gh4a5g5c.com/userfiles/files/47641963935.pdfIn PDF document text
    • http://dvarenda.ru/upload/file/56161386178.pdfIn PDF document text
    • http://cdn.eagle.mn/uploads/userfiles/files/17316994375.pdfIn PDF document text
    • http://gursakaryahukuk.com/images/file/wanuralot.pdfIn PDF document text
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/damisiwodunavusoxasasaxit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=resumen+del+libro+de+utopia+de+tomas+moraPDF 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_off0000e0f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F6 17576 bytes
SHA-256: c18f461ea3255f0aa2d9c6143a35a0e62fd668c4dd6dc5c7f4e4ca68df1dd1e1
font_01_sfnt_off00010ded.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DED 10836 bytes
SHA-256: 642b244fa3a39ca63166e057a25f209f974f7abbf2f63db25703d6470a89a5b2
font_02_sfnt_off000126a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1