Malicious PDF — malware analysis report

Static analysis result for SHA-256 f94ec5756fb483be…

MALICIOUS

PDF

76.9 KB Created: 2021-09-02 20:44:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cdaa6bb7da6686d83d39bdadbbf72895 SHA-1: afd53a244ede12958ca532d2b96c751268b13e2f SHA-256: f94ec5756fb483be78c54e5fa4809e1c532df172a1ffab93912cc01904b51c09
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. It contains a link farm pointing to multiple compromised WordPress upload directories, suggesting an attempt to distribute malicious content or phishing pages. The presence of numerous unknown URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160870f92c71ef---wodapaxemaxozikulefetik.pdf In PDF document text
    • http://banner-ever.com/ckImg/files/xinujepakotuxavuwapuja.pdfIn PDF document text
    • http://twilaw.com/files/files/nepoxajim.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b3abada75c1---lamezodejomen.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/1s26uatiobe168eu5fpgdb8qf6/3385012455.pdfIn PDF document text
    • http://studiobaliva.eu/userfiles/files/47778489326.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e78a65c28b---10985083450.pdfIn PDF document text
    • https://suma.ca/upload/editor/file/fibokutugatufuzowadotofag.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/chlqh6a6hhlg35l78ei544vue9/88414576446.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e06861a2930a06fd52f0a36e29077f6f/84601189389.pdfIn PDF document text
    • https://borgopitti.it/userfiles/file/17452289287.pdfIn PDF document text
    • https://nexapos.com/upload/files/95120689062.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/5855500352.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/kvd6d3u5hsmgh7dpvlvna1auh1/dezedigowoxepafefoxema.pdfIn PDF document text
    • http://dhs1959reunion.com/clients/871764/File/9297407460.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/t6pr9sttc59kl7mebtepoje9oc/vefekerumi.pdfIn PDF document text
    • https://ms01bet.net/contents//files/34213738404.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9c4b12d0e5---77248549296.pdfIn PDF document text
    • http://haverfordhigh77.com/clients/e/e7/e7c5a96ea35a64a1345a575153f12e7e/File/68761404413.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/84234989001.pdfIn PDF document text
    • http://weiddy.com/uploads/files/202108202355203288.pdfIn PDF document text
    • https://chuyennhakienvangvn.net/upload/files/xetamekijajikititi.pdfIn PDF document text
    • https://playerpress.com/ckfinder/userfiles/files/76167783859.pdfIn PDF document text
    • http://dezis.ru/uploads/files/nanerebikoveparodajemulas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=project+report+on+employee+satisfaction+survey+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • 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_off0000c5d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ddee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDEE 11192 bytes
SHA-256: 9b273392174c8a70d54f8cafdde26f4fd3eb256323bc5741d1f77abc0920cd88
font_02_sfnt_off0000f81e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF81E 18104 bytes
SHA-256: 68052ab877008cd2e0d4ffcd78e3ef1b5589b35f41708b25487ec33b0f52faa6