Malicious PDF — malware analysis report

Static analysis result for SHA-256 77f6a87b7d98f716…

MALICIOUS

PDF

144.2 KB Created: 2021-09-02 14:13:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9e2094173ce6412e6a6bacd8430b93c2 SHA-1: 71a2b554c92e7e42a4d6039b242ac84643dd41ee SHA-256: 77f6a87b7d98f71665e9b95d463dcbd91fc67cef5b71fcae19af676b4781a4e1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating it contains malicious content. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to lure users to malicious sites. The presence of multiple unknown URLs further supports this phishing or redirection attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5102

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 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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://messianic.live/wp-content/plugins/super-forms/uploads/php/files/3d8da99c912168b6300eda71afca4f56/zodufinuzudakot.pdf In PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607a9c2c616e3---pefutipirukanajozekepob.pdfIn PDF document text
    • http://w-mill.jp/images/file/topawodivu.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/5ca82115465b2c83e6d55533b6a193ac/11465499029.pdfIn PDF document text
    • https://lombardpruszkow.pl/local/userfiles/file/pavovudefitubaw.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/psbohpgp67agnmnk7v5ki4di2k/24659467674.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160944af1cf59c---wewonuzefaxitar.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160be9ae7371c3---jufodelup.pdfIn PDF document text
    • http://www.rafaellucenaehijos.com/ckfinder/userfiles/files/xogewasusimipawunelo.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/16089a4dc74922---81142137344.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac824feeb33---zopagobulipazimas.pdfIn PDF document text
    • https://lecormier-menuiserie.com/www/upload/files/19244499637.pdfIn PDF document text
    • https://theatresaucinema.fr/uploads/file/fotupimaguvisuxigedan.pdfIn PDF document text
    • https://viettincapital.vn/upload/files/11451588942.pdfIn PDF document text
    • http://mnarch.it/userfiles/files/85414633100.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093a5c404a35---91107852320.pdfIn PDF document text
    • http://orderkai.com/uploads/files/58079561209.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/467ed0df4dcc743944f056a8b2f39225/65898238770.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/16105ca36789f6---dexanufogutanarivol.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9754080a1---xofebijipuwigosot.pdfIn PDF document text
    • https://floridagreatescape.com/media/file/16591115373.pdfIn PDF document text
    • http://gorsilawfirm.com/userfiles/file/fegegozupozesifobejulowat.pdfIn PDF document text
    • http://flywings.sk/UserFiles/file/80159756754.pdfIn PDF document text
    • http://ohsclassof73.com/clients/9/9a/9a21b0b253f7c4eafe662346d237c286/File/33924246548.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086be3b087bb---83885605101.pdfIn PDF document text
    • http://simonhoirup.dk/userfiles/file/42223209819.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=six+sigma+for+green+belts+and+champions+pdf+free+downloadPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001d5f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D5F5 11472 bytes
SHA-256: 05a1b86723f79a4acf5c47b6cc74f26cc84b734fd4e2f740c0026caa62b95184
font_01_sfnt_off0001f086.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F086 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00020898.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20898 21100 bytes
SHA-256: 0f40ab1859e602e427cd5f8c03d8c08ad88d903cc8b2b758a5ed0d5c6ce14779

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