Malicious PDF — malware analysis report

Static analysis result for SHA-256 135fb2ef548f1252…

MALICIOUS

PDF

63.8 KB Created: 2021-09-16 01:04:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 1477b7b36a5b58b8eb65b7aa082229cb SHA-1: 404c2fab09c61fe4a10ee19f50385a0832c6106e SHA-256: 135fb2ef548f1252dcc9ffc966af0999387f8119d5c029108e076e69a7cee280
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links pointing to external resources, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were directly extracted, the presence of numerous external links suggests an attempt to redirect the user to a site that likely hosts a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7155

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://home-consult.lu/userfiles/files/sabanatemigaratobevutug.pdf In PDF document text
    • http://guchen.ru/d/files/1357650796.pdfIn PDF document text
    • http://dtyxbpzx.com/filespath/files/20210908172539.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/3668503419.pdfIn PDF document text
    • http://mixmarketing.vn/upload/fck/file/3115352500.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/161315500d7ac5---47942757998.pdfIn PDF document text
    • https://t-groupvnxkld.com/uploads/news_file/betixodexajopomarakokogaw.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613f12477a00b---pezuworonolu.pdfIn PDF document text
    • https://brincandoeaprendendo.com/fotosempresa/files/86482626898.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/452f281e7b76a69a08ba7454094bb181/8500643300.pdfIn PDF document text
    • https://firsatpin.com/calisma2/files/uploads/37276868587.pdfIn PDF document text
    • http://villacappuccina.com/userfiles/files/paberutugesavopame.pdfIn PDF document text
    • https://autopsrus.aerovents.com/ckfinder/userfiles/files/jivatalalakud.pdfIn PDF document text
    • https://ladida.asia/sporlegen/administrator/imagetempfile/83238533918.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/39f533975d03de1f07b21beef83d7736/jusanozexiseg.pdfIn PDF document text
    • https://matfreklam.com/calisma2/files/uploads/1609935229.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/161380a4bc3b71---29030379687.pdfIn PDF document text
    • https://gotoko.com/cmsv2/upload/files/patigos.pdfIn PDF document text
    • https://edinburghpools.com/contents/files/10140932583.pdfIn PDF document text
    • https://lose-weight.tw/upload/files/97647215028.pdfIn PDF document text
    • http://girisimcilikproje.com/resimler/files/jobelapikofado.pdfIn PDF document text
    • https://stthomasorthodoxchurchsouthpampady.com/userfiles/file/43029294009.pdfIn PDF document text
    • http://wdnederland.nl/file/fazowuluf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=android+1+age+of+war+2PDF link annotation
    • 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_off0000c8b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8B6 10456 bytes
SHA-256: 754ec7710e50caf258ad68fdb14ac6dba87b7544db8f139e4ba40016c90f88e4

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