Malicious PDF — malware analysis report

Static analysis result for SHA-256 01548ca1e4977fae…

MALICIOUS

PDF

63.7 KB Created: 2021-08-08 11:46:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b306a02d8aab57fc6cef137a59730176 SHA-1: 3b729cf6d4fc5a9f6587cb7972f822a885fe8af1 SHA-256: 01548ca1e4977fae20bcc4c6c83852d51bfdd47d78f069f66d63ecc81d25610f
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to distribute malicious content. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classifiers also flagged it as malicious. The presence of external URIs and compromised CMS upload links suggests the PDF is used to redirect users to potentially malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6093

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 https://inwebjor.ru/uplcv?utm_term=cuales+son+polimeros+naturales PDF link annotation
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/m8h24h9bfoc90tnpfetf3nacc1/jojenadiwenun.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160b10674ab67c---garimul.pdfIn PDF document text
    • http://relatives-united.com/clients/75139/File/19461742550.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/2jnm82mvrlgv6bpqdublfc8br4/97408186552.pdfIn PDF document text
    • http://stpetersame.com/clients/9/91/91902b33218228c9a3691be2563b71f1/File/57272589980.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/daloxusuzopejalupazi.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/74f249b67f6bbf980a03768065025cc8/gimevivakax.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/btubpu3oae1kvi797fpv1l0c92/76960665990.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210523150356251.pdfIn PDF document text
    • https://vegan-eshop.cz/data/file/75009970168.pdfIn PDF document text
    • http://kaowei.tw/image/files/20210607_092612.pdfIn PDF document text
    • http://zwickerfoto.hu/_user/file/93125317830.pdfIn PDF document text
    • http://autowagon.it/userfiles/files/vosipavekigep.pdfIn PDF document text
    • http://liqaa-lb.com/files/userfiles/files/sofakijupopotasezan.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/16103c7ad5e170---perevuzufararet.pdfIn PDF document text
    • http://jonmechina.com/ckupload/files/486837136.pdfIn PDF document text
    • https://west-holding.com/userfiles/file/madomuvijojumitusebipom.pdfIn PDF document text
    • http://telegid.tv/userfiles/files/67195599460.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/51564380100.pdfIn PDF document text
    • http://cdmatik.com/uploads/file/xoxemo.pdfIn PDF document text
    • http://clinivetmadonnadirosa.eu/userfiles/files/fogeron.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b98ac504e80---gosewosezudomuvuxisilevag.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/zetokixowobujipet.pdfIn PDF document text

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