Malicious PDF — malware analysis report

Static analysis result for SHA-256 524a57c19c672078…

MALICIOUS

PDF

102.8 KB Created: 2021-08-13 16:02:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: be5f633a318edc9b068e8f1a4e7e2e9d SHA-1: bc6216d844bcf87c7e3a1e3e8a5efac688446d51 SHA-256: 524a57c19c6720782d40901712e90a30f9123a840692bc2c16554d27cdec3348
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many of which point to compromised WordPress upload directories. One high-severity heuristic indicates a link to an algorithmically-generated URL, suggesting a phishing or malware distribution attempt. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, likely to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5847

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://archism.ru/uplcv?utm_term=ejemplos+de+integrales+trigonometricas+inversas PDF link annotation
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/f6646fbfb373820ca9d298753e397f54/siripifavoxanexedak.pdfIn PDF document text
    • https://isosklo.cz/uploads/38697896651.pdfIn PDF document text
    • https://hiampelectric.com/wp-content/plugins/super-forms/uploads/php/files/279a9d090cd19af242ae80c806ea2875/xitexixuvut.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/459737246c40719c524952f1efb9bbfa/gujikukujogowolowososu.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/89216127972.pdfIn PDF document text
    • http://ediljolli.com/userfiles/files/xexemakavuvagunirojugu.pdfIn PDF document text
    • https://ewdel.cz/ckfinder/userfiles/files/6512142944.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e01292a902---vanoriwoziditixob.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/s4h7i4aka1722b3btmqjsfvmr0/vakobegamerufulosi.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3314192be3---54659786392.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202105/file/bugatekirav.pdfIn PDF document text
    • https://llibreriaha.com/img/events/file/zubigeralulor.pdfIn PDF document text
    • https://mwasafat.com/uploads/files/jowomudekote.pdfIn PDF document text
    • http://dfwsedan.com/nbloom/fckuploads/file/meferar.pdfIn PDF document text
    • https://akita-inu.lv/www/files/files/wisusisumedukozimim.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/bepejefe.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/366ee701ae884d78ed3a96c3e00af95d/gipobozuzonalefuzev.pdfIn PDF document text
    • https://esz.jp/img/editor/files/jitigapibisozilafagak.pdfIn PDF document text
    • http://31kouqiang.com/userfiles/file/1628247524.pdfIn PDF document text
    • http://artistalexanderkanevskywinnerinternationalaward.com/clientMedia/file/50625989916.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/5d5975816c11eee0b9e2de4195719574/xufusuvumimabezisekeki.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/60015082001.pdfIn PDF document text
    • http://webinside.pl/userfiles/file/45365415885.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017d91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17D91 16140 bytes
SHA-256: 9fc4adf05be99ba94f6c9714e81f71f84bd824bf50d5ec5f1123f813e28a211d

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