Malicious PDF — malware analysis report

Static analysis result for SHA-256 89d2f8e0ec8b414a…

MALICIOUS

PDF

174.9 KB Created: 2021-09-03 23:00:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 2d755b7f5f5b25d4f88f4be37c6346a5 SHA-1: 956ada4565dd26e40e96cf2c73f685ef1d46084d SHA-256: 89d2f8e0ec8b414ac3256b13aeefa9788c14e75f99af7d2b0f8765a6fd17c734
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed for phishing or malware distribution. The ClamAV detection and ML classifier further support its malicious nature. No scripts were extracted, but the embedded links are the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7127

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 https://adreshosting.com/calisma2/files/uploads/92466324255.pdf In PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d5bc0556d0a---36806990175.pdfIn PDF document text
    • http://airelimpio.mx/img/editor/file/nusejenedesopesedepulu.pdfIn PDF document text
    • http://yishiweb.com/upfiles/files/20210611_023722.pdfIn PDF document text
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/4000474155.pdfIn PDF document text
    • https://washlounge.in/ckfinder/userfiles/files/livezowoke.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c20d24cf35a---turepegotevumavegefifawu.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/43605493148.pdfIn PDF document text
    • https://weyergans-hcc.lv/userfiles/file/zodelevamikoxovaset.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/silavizapufekus.pdfIn PDF document text
    • https://bitree.ru/ckfinder/userfiles/files/85455016168.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.net/ckfinder/userfiles/files/58143978212.pdfIn PDF document text
    • http://tutek.eu/userfiles/file/80858886090.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609883333b515---74911499514.pdfIn PDF document text
    • http://hodinovysoused.cz/upload/file/jatiri.pdfIn PDF document text
    • http://ijdssymposium.eu/upload/1235221604.pdfIn PDF document text
    • http://yuha.be/_files/file/vebeliwiruk.pdfIn PDF document text
    • https://coop-alternatives.fr/images/images/vuwezin.pdfIn PDF document text
    • http://bjsixiang.com/jingkelun/userfiles/files/20210816104143.pdfIn PDF document text
    • http://skazka76.ru/pic/userfile/varoletifizefumes.pdfIn PDF document text
    • http://limobebe.com/userfiles/files/patafog.pdfIn PDF document text
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/zebajubejenugevaxixinuju.pdfIn PDF document text
    • https://sensesgrouphk.com/louis/STARKGROUP/ckfinder/userfiles/files/zaxilemevagowur.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/97035892404.pdfIn PDF document text
    • http://kompassztuki.pl/Image/files/firiwaxenifesonaxadijenek.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/dobawirixakuseg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=examkrackers+mcat+chemistry+pdfPDF link annotation

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