Malicious PDF — malware analysis report

Static analysis result for SHA-256 a743776973fd8bb5…

MALICIOUS

PDF

122.7 KB Created: 2021-10-05 12:32:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 639d5f23f2b9f17798a3dbc6918cdab4 SHA-1: 5dfed82d863887babbb7e31a6733f42713e95010 SHA-256: a743776973fd8bb5494b170a7d9fcb42d98d96bbbb0e9cdc53b981479762107a
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a phishing trojan by ClamAV. Static analysis revealed it functions as a link farm, directing users to multiple external websites, many of which are hosted on compromised CMS platforms or disposable domains. The presence of numerous PDF-specific heuristics related to URI and link farms indicates a deliberate attempt to obfuscate malicious destinations.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4549

Heuristics 5

  • 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
  • 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://remobudostol.pl/pliki/60424308183.pdf In PDF document text
    • http://scherzerpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/binuloji.pdfIn PDF document text
    • http://snuhonors.com/userfiles/file/jiwogiwolojo.pdfIn PDF document text
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/44561762897.pdfIn PDF document text
    • https://aynispirit.nl/userfiles/file/53513356969.pdfIn PDF document text
    • https://tinhhoaxanh.vn/userfiles/file/vufuta.pdfIn PDF document text
    • http://cmorshomecareassociates.org/uploaded_files/userfiles/files/tibawutarawuva.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/161367831c369e---jotegodeturubexevero.pdfIn PDF document text
    • http://abwlanham.com/uploads/files/7756406211.pdfIn PDF document text
    • http://studiopol.com/userfiles/files/77276060527.pdfIn PDF document text
    • http://perfect-aerosol.eu/userfiles/file/53565076314.pdfIn PDF document text
    • http://feuerwehr-mittenwalde.de/mediathek/files/domufo.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16157264431294---tokiramidomipikodekov.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210925203613.pdfIn PDF document text
    • http://kammed.com/userfiles/file/sugunarudix.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/d34912410c0adabedfdb7ff3df8d1017/bowuguvafenudobevu.pdfIn PDF document text
    • https://hmradiatoriai.lt/images/files/foloraxum.pdfIn PDF document text
    • http://lso-msm.com/userfiles/file/nalif.pdfIn PDF document text
    • https://omprintandpack.com/userfiles/file/77373336681.pdfIn PDF document text
    • https://trompis-tondschungel.de/userfiles/file/tadepaxa.pdfIn PDF document text
    • https://www.multilandtours.com/assets/ckfinder/userfiles/files/92895015663.pdfIn PDF document text
    • https://kolegium.inaheart.org/upload/files/derulapuwatiri.pdfIn PDF document text
    • https://big-affaires.com/img/pics/files/77355732855.pdfIn PDF document text
    • http://sghr.ca/upload/ckfinder/files/74287984978.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613eebd7846a0---23089207534.pdfIn PDF document text
    • https://marlin-aquarium.ru/ckfinder/userfiles/files/dudejagagotixokeg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=uncle+tom%27s+cabin+book+pdfPDF link annotation

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