Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e5b5e67f8401862…

MALICIOUS

PDF

79.0 KB Created: 2021-07-25 21:50:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8db9c92b6c48c388d7566ec695929796 SHA-1: 915c19949c786479213c86b2c873da32fffe1048 SHA-256: 1e5b5e67f84018623259796f9a1ca6597d597a152d0cf3c7c394e29ecc994b0d
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains a link farm pointing to numerous external PDF files hosted on compromised WordPress sites and other disposable domains, suggesting an attempt to distribute further malicious content or conduct phishing. The presence of embedded URLs and the nature of the heuristics strongly indicate a malicious intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8784

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 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 http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077ffe7641b2---lapirawiburukox.pdf In PDF document text
    • https://langumeistras.lt/i/File/57361310390.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccbfd6e85f---xitibaloli.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160723b9126e9c---75611527917.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/1697910877.pdfIn PDF document text
    • http://c-six.it/userfiles/files/70684534828.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/maverapegigafuw.pdfIn PDF document text
    • http://shannonlakeestates.org/fck_images/file/jaxegalulovuzuzejogoxukaz.pdfIn PDF document text
    • https://www.ideaklinikbursa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160707741c1569---gavijuvagebigonawada.pdfIn PDF document text
    • http://fairytaleweddingsandeventsbymary.com/clients/f/f2/f272f95a0afb65faa7304057ec0e56f6/File/lezulonaj.pdfIn PDF document text
    • http://thaoduocquyhiem.com/userfiles/image/file/20355581067.pdfIn PDF document text
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/23d98782e5785520272afd636e867247/benaladedoduvalidotirubep.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/197pj6aqc90ba6t3fu4i64lgof/75928303388.pdfIn PDF document text
    • http://thicongdiennuocmiennam.com/uploads/files/sekewavevupiguponakaler.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/5cg5iodmk5lp9q4drkn8k36255/36976357058.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/6a381e4e70301bc84e3d17d29498a572/31906981901.pdfIn PDF document text
    • https://gites-les-bardots.com/userfiles/file/70336736282.pdfIn PDF document text
    • http://wagnerpc.com/userfiles/files/vuziropofuwizinegiwuro.pdfIn PDF document text
    • http://pratiklinik.com/img/userfiles/files/babaf.pdfIn PDF document text
    • http://sbkf.org/files/files/46178201683.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/e55d54f911c54e6ea5468388b19b5cef/98473309757.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/25cd8b57a9e4ed234d80673005789e30/mozirelidemezam.pdfIn PDF document text
    • http://dgjinhak.kr/DATA/upload/files/202106080435568942.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ebc8e3fad2---fafakaretoxirirotaf.pdfIn PDF document text
    • http://dlikefulproductions.com/clients/875850/File/rukuxixiripogonugom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=what+is+definition+of+airportPDF 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_off0001040f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1040F 10540 bytes
SHA-256: 1159e5ce8d4cb049036edfa6e7ba4c6aa455e92c98b72992b7b0f7015e5ed735