Malicious PDF — malware analysis report

Static analysis result for SHA-256 95452b99354d37df…

MALICIOUS

PDF

71.3 KB Created: 2021-09-07 07:28:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 166fc117631ef4d426d30896d3cd2f51 SHA-1: 9646b4b2e2075154551cf186f91ad6229882e5d8 SHA-256: 95452b99354d37df9b34d6a72f14d3369b8a9a0cec800f1feadb74cb6b1bff86
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning model indicated a high probability of maliciousness. Several heuristics indicate the PDF functions as a link farm, directing users to multiple external websites, some hosted on potentially compromised CMS upload storage. The document body is truncated and unreadable, but the presence of numerous external links suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://illinoislivestock.org/userfiles/file/vumaponuzidirenojunazuzif.pdf In PDF document text
    • http://cityclick.it/userfiles/files/76351456905.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/files/38575000692.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/8jhj1dvgesdapgvco01lv7mqcn/robute.pdfIn PDF document text
    • https://llibreriaha.com/img/events/file/vurodafutunurusases.pdfIn PDF document text
    • https://bodegoncriollo.com/userfiles/file/6387393582.pdfIn PDF document text
    • http://antansconstructions.com/ckfinder/userfiles/files/9687689973.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/7be105a0fbdb6e3e47fdc557626a177f/tetex.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/63172415614.pdfIn PDF document text
    • http://altinay-law.com/images/file/53733303314.pdfIn PDF document text
    • http://issaproject.com/app/views/panel/ckfinder/userfiles/files/pemikisukugavu.pdfIn PDF document text
    • https://arrad.ch/modules/ck/ckfinder/userfiles/files/11366102349.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ebc644b79---wikupepa.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/t8oi9p8m20gf87jv9g2d343it1/25556699526.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c758071b8ee---xebesejivuvivifabusawa.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/59049325585.pdfIn PDF document text
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/lavojebatikase.pdfIn PDF document text
    • http://studiopassarotti.it/userfiles/files/32030791494.pdfIn PDF document text
    • http://studioriboldi.eu/userfiles/files/96706784073.pdfIn PDF document text
    • http://bernardthevenet.fr/ckfinder/userfiles/files/90306250506.pdfIn PDF document text
    • http://chizclean.ru/files/fck/file/merolig.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608054e9636f8---83562036928.pdfIn PDF document text
    • http://sladkiy-ostrov.ru/userfiles/files/sebonakitupotutixomokal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=arundina+graminifolia+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_off0000b4dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4DC 10524 bytes
SHA-256: b30671f4af95235871088e2ac30515f4f3bda33812398ac62791905ee55d0633
font_01_sfnt_off0000cc76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC76 17096 bytes
SHA-256: 3e7505a7b50be77aa0d47e754ac88c961df1114e53bec90ee87151f508793237
font_02_sfnt_off0000f7f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1