Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf84c50498303985…

MALICIOUS

PDF

90.5 KB Created: 2021-07-21 04:46:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 1f85c243b9aa59286cdf3ecb3616eaa4 SHA-1: efe093999524156cb4c39a703a274789f088e580 SHA-256: cf84c50498303985baab835d4161eb7f9fdc7bcc77156fa58a157965c3d6cc0c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress upload directories, indicating a link farm designed to obscure the final destination. ClamAV and ML classifiers flagged this PDF as malicious, with a high ML score. While no scripts were extracted, the structure and URL findings suggest a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160c6c411b1ff5---vizawukaro.pdf In PDF document text
    • http://provia-events.de/pics/fotos/1/file/43825369743.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c53b0a6aba2---pobobawariwibo.pdfIn PDF document text
    • http://teamwork-poetschke.com/ckfinder/userfiles/files/13413737587.pdfIn PDF document text
    • http://centreforeffectivecoaching.com/media/file/jivuxulapomuxadukixedozun.pdfIn PDF document text
    • http://homenet-spb.ru/userfiles/file/dividomosaveronalo.pdfIn PDF document text
    • http://banlinhkienlaptop.com/userfiles/file/74583588423.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/bunipozogubinuzeto.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077a61bab1f0---31540219571.pdfIn PDF document text
    • http://envigest.cz/upload/file/mabawajanegaserifukudizem.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/3b6693d49f120b576c31e03c2fb62238/91075910363.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/c018ffe2f693c573970da9f46ed631c3/sinotibatiraxo.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/6e2lor1bgtj242f9oev7eqivhm/57465563619.pdfIn PDF document text
    • http://hotelbellevuepalermo.com/userfiles/files/dinumowovapowavagakafufon.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/xamado.pdfIn PDF document text
    • http://landpas.pl/upload/file/lutejivoluzaboxe.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/3556106962.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607a65c8d5824---pasasedavuleriloronu.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/07002df2d118565b3bf2197412f3a489/febetixogexigoxa.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/u7l70o76soteb4s5r8esmbtch7/modetugame.pdfIn PDF document text
    • http://nhadephoanhao.vn/upload/ckupload/files/4412170767.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/4ud0tp123dj6hfdph7eugnmk47/86669906039.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=how+are+you+answer+in+interviewPDF 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_off0000fe7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE7D 10412 bytes
SHA-256: eb6e4304eff3d33df69d7cb92f519f17bff4546f73a6a502a8409b72780db69c
font_01_sfnt_off00011646.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11646 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E58 17424 bytes
SHA-256: a12f1ec7d68083eec5a16ddcc22d59694d33475b15a3579bf330f8a7232412ad

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