Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d21c2d147562f2c…

MALICIOUS

PDF

80.4 KB Created: 2021-09-20 18:53:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 32a3e04c0bf96fd560caf60440fc698f SHA-1: 3cf40cf10d101a255463d838fc00d3fbb84a4068 SHA-256: 9d21c2d147562f2c7594d94e45ff1a61680488533731b68bddd002234a25c9de
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or are part of link farms designed to obscure the final destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to phishing or malware distribution sites. The presence of multiple compromised CMS upload links suggests a pattern of leveraging vulnerable web infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://strategie-online.net/catalogue_dynamique/file/junekevexibogedik.pdf In PDF document text
    • http://ydyb.com/filespath/files/20210903093343.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144f38da0055---33614349335.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4af6107c28ec51b6d67bdeeefe45bb61/25316197163.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136c5f511e8e---barazafixinegejutur.pdfIn PDF document text
    • https://kaskad-74.ru/images/uploads/revoxawur.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/49193905560.pdfIn PDF document text
    • https://everestart.com/images/stories/file/pivizavejuba.pdfIn PDF document text
    • https://leciv.fr/uploads/FCK_files/file/todinugoso.pdfIn PDF document text
    • http://tecniagua.es/uploads/ckfinder/files/zukenuterun.pdfIn PDF document text
    • https://calienglish.com/ckfinder/images_store/files/17226392635.pdfIn PDF document text
    • https://emotionalgift.com/ckfinder/userfiles/files/rojafepuwosomiporatuna.pdfIn PDF document text
    • https://bibliotheque.ville.deux-montagnes.qc.ca/ckfinder/userfiles/files/94203080156.pdfIn PDF document text
    • http://kindergartenhelden.at/upload/file/xozuziwutol.pdfIn PDF document text
    • http://gardena.crazyrockinsushi.com/uploads/files/woteviresovisaxijez.pdfIn PDF document text
    • http://laserinnsbruck.com/static/zedoxepidiwilixapafex.pdfIn PDF document text
    • https://promenade-perpignan.com/userfiles/file/bupawaxujuz.pdfIn PDF document text
    • https://rougezenekar.hu/files/file/68032511753.pdfIn PDF document text
    • http://roland-toys.eu/userfiles/file/fisevokalo.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/3285008043.pdfIn PDF document text
    • https://haysalon.com/public_html/userfiles/file/22648859704.pdfIn PDF document text
    • https://costabravas.com/uploads/localidades/files/famaguwabomoxizusitowaxuk.pdfIn PDF document text
    • http://abbeytraining.net/userfiles/file/tefogaritup.pdfIn PDF document text
    • https://liftsystems.ro/LiftFiles/file/jezipoduzogapukubigo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=download+funimate+pro+apk+latest+versionPDF 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_off0000d537.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD537 17340 bytes
SHA-256: f6e39309edc16c28a5d519c2ab00a4757148abee47e91805c316e0121ebc5ead
font_01_sfnt_off0001025b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1025B 11004 bytes
SHA-256: 5aec61a4d83b6f42b637ff49e4d42440f97c9204c31aa64fa5549f2e5753aff8
font_02_sfnt_off00011bf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1