Malicious PDF — malware analysis report

Static analysis result for SHA-256 5328c92e5d12aab8…

MALICIOUS

PDF

101.5 KB Created: 2021-07-21 13:09:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 31411a7e58a6302fc8b0d7c134dd29d2 SHA-1: 29185440eef216af59cdbe4648bb21cd05fa2467 SHA-256: 5328c92e5d12aab8f83b12818d634c16c2b78c63035faca61a3a8f7a48b47116
124 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with several pointing to compromised CMS upload directories and disposable hosting. ClamAV detected this file as Pdf.Phishing.Trojan, indicating a malicious intent to lure users to potentially harmful websites. The document body is heavily obfuscated and unreadable, providing no direct textual clues, but the heuristic firings strongly suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier clean score 0.1724

Heuristics 5

  • 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
  • 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://retta-bg.com/userfiles/jezaruv.pdf In PDF document text
    • https://tavio.ru/files/file/dolon.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/1aa1vmc7496of747ubeo0trjf6/37698433990.pdfIn PDF document text
    • http://www.espace-hotelier.com/ckfinder/userfiles/files/pitetolabi.pdfIn PDF document text
    • http://aranykoronakft.hu/userfiles/file/11655982460.pdfIn PDF document text
    • http://slenderclub.cz/ckfinder/userfiles/files/82344429435.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608803679f755---lubatev.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16089e11db8c84---wipagulakojafunimure.pdfIn PDF document text
    • http://dieta-plus.pl/userfiles/file/71698305257.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d45c43f1f51---27431493311.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/e81fd82b1abe711abdb5818953ef6bce/35544251883.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074d43b4ec37---zisiledumi.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/lozosunanarumuzowigigaw.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607267f610b33---6544221277.pdfIn PDF document text
    • https://giriconsultancy.com/content_files/files/17834586077.pdfIn PDF document text
    • http://sweetbasketsbyjackie.com/clients/864293/File/tolakadopalapefiwa.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/5f9ba261cc73d9b89879ce9718930b93/29203843058.pdfIn PDF document text
    • http://hyundaidongdo3s.com/images/files/zatejajuvijiza.pdfIn PDF document text
    • https://avphunter.ro/ckfinder/userfiles/files/93911127543.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8ff37df66b---95537541653.pdfIn PDF document text
    • https://veljun-ldm.hr/files/7884093469.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080c4337f148---metebaporofinuzokut.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b63c6a89196---bekixiw.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/3edff63a7e8ce25a57c34272eabb4f65/molijugetuvonafibip.pdfIn PDF document text
    • http://foto-video.ch/userfiles/files/gaforogif.pdfIn PDF document text
    • https://agermag.ro/mm/file/65510195601.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16093fc995da10---65156838102.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=best+beach+in+falmouthPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013df6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015608.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15608 17868 bytes
SHA-256: 6370ccdbbf7c2cc25d89b4a28fb97fe4dbe3962a1ab7e2e7bc356fecc870553f