Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6f8748190526811…

MALICIOUS

PDF

83.2 KB Created: 2021-07-17 00:48:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 52a64d182826b9229ad6a2119fc84cf7 SHA-1: ef2693a6822f7b30c83b3cd842033a8be3272092 SHA-256: b6f874819052681149182887116f59c7299dc57e9e098dbdfb266a14dcdbc104
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm or phishing lure. The ClamAV detection and ML classifier further support its malicious nature, classifying it as a phishing trojan. The document body is heavily obfuscated and unreadable, providing no direct textual clues, but the heuristic firings strongly suggest a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5616

Heuristics 5

  • 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 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://edcasys.com/ci/userfiles/files/xepogufixu.pdf In PDF document text
    • http://ddservice-bmw.pl/userfiles/file/38821489711.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-5-6/20210506192203808774.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1ad29e5a9---77668041950.pdfIn PDF document text
    • http://frangarcia.eu/upload/file/58285123306.pdfIn PDF document text
    • https://theatresaucinema.fr/uploads/file/20053149964.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083157035062---divufoduzaren.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/306a458c575a5d18539e2ac124cdd133/5372273051.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b413557ac48---winixevisilaliguvozuredo.pdfIn PDF document text
    • http://leilehua76.com/clients/4/4d/4d80c013f15dbe3c797666a457780dca/File/41209599003.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074cbfec330d---luxigamube.pdfIn PDF document text
    • http://karmand24.ir/basefile/ehotel724ir/files/21836118038.pdfIn PDF document text
    • http://intestinalfortitude.org/clients/0/0c/0cf504f131cb0201443a7bd449519f4a/File/80332225004.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/ed6ad230f65788ffaadb78eefd99dbc6/nozitufoberajujeleves.pdfIn PDF document text
    • http://74ahs.com/clients/2/2a/2a132ee8da0778863662fd4b1fa251ed/File/93920358031.pdfIn PDF document text
    • http://etre-belle.su/images/file/27948065801.pdfIn PDF document text
    • http://nhhs78.org/clients/63854/File/63124911328.pdfIn PDF document text
    • https://menu2uplus.com/images/file/55061014010.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070d82b4c729---72985953184.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a10b1795004---vumewodulagusefikuvegi.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/9a10ad5771f73944944ce939d62da3cb/35294974939.pdfIn PDF document text
    • http://lnimeina.it/userfiles/files/malegowulesizixisemubenes.pdfIn PDF document text
    • http://pressvaluation.net/userfiles/file/loresolimonelovo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=examples+of+sedimentary+structuresPDF link annotation

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