Malicious PDF — malware analysis report

Static analysis result for SHA-256 9aff9b234f86f7e5…

MALICIOUS

PDF

125.3 KB Created: 2021-09-01 09:02:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 31d5f1ec32b08fdba992983f0e3a4554 SHA-1: ad95f71bdad62322e195756bd202e176b2278a6b SHA-256: 9aff9b234f86f7e5569fcd55199018e66598dfd9ad2e1c26d3c087de2a1b1aec
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to various websites, many of which are hosted on compromised CMS uploads or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of a link farm suggests an attempt to obscure the ultimate destination or to leverage SEO poisoning.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/i2085ns9omgnosi1bpio0rcj2l/niraxodabezuxor.pdf In PDF document text
    • http://sumterhigh89.com/clients/863574/File/fevirorunewime.pdfIn PDF document text
    • http://csc-020.com/userfiles/file/20210728092525_6izeyl.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bee057d89ba---kusizebuge.pdfIn PDF document text
    • http://netisiletisim.com/guvennet/resimlerfiles/raloxewulagugita.pdfIn PDF document text
    • http://mea-travel.pl/userfiles/file/63132681820.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/84715859762.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/de1b382057d39e26e9252dd2f3637b6d/lipuzipiwafukuralusoda.pdfIn PDF document text
    • http://stepasidemedical.ie/images/uploads/file/38511220686.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160977d739a051---5712901783.pdfIn PDF document text
    • https://mollis.rs//files/bufadoxibiwoponukip.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081aa8a714db---jebotepanojuwadevi.pdfIn PDF document text
    • http://radtel-sport.pl/userfiles/file/wefadekeri.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/l9prficnhi5695e9kiiecc26t2/kutudonejurono.pdfIn PDF document text
    • http://teedinmaesai.com/user_img/file/dowomikonebufu.pdfIn PDF document text
    • https://digireg.li/upload/doguvefuse.pdfIn PDF document text
    • http://greddy.com/admin/common/ckfinder/userfiles/File/9094808259.pdfIn PDF document text
    • http://art-wonders.com/ckeditor/ckfinder/core/connector/php/uploads/files/70153134162.pdfIn PDF document text
    • http://magiepourenfants.com/images/mediamanager/file/jodaxunasapakirira.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1e2ce7f044---19759643100.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4e152e4025---36884795973.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/p72bv732n26juehngerclg5d1k/tugakatogi.pdfIn PDF document text
    • http://abpaluso.com/upload/file/3679037804.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=stan+weinstein+profiting+in+bull+and+bear+markets+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_off00017a2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17A2C 21772 bytes
SHA-256: 308b92551bd9c4ea4a4819b6eca26d601c47172153f0d2e72d774055c8b29c5e
font_01_sfnt_off0001b3a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B3A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001cbb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CBB8 11332 bytes
SHA-256: 7517270e89dd04a3217d76027aafccde82068027e38344b9e6ffaecebf97ad7a