Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd15fb6d27e9778b…

MALICIOUS

PDF

83.9 KB Created: 2021-09-12 12:52:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5b730e159643c16fced734e4dc1fdf99 SHA-1: add94d3dff28af13a6485c06e863352c5f601526 SHA-256: dd15fb6d27e9778b4207bd32084a8764f51f1f690e2817d99e1e24883a11bf30
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to lure users to malicious destinations. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the heuristic firings and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • 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://ecohost.ru/pics/images/file/16886289599.pdf In PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/28697262978.pdfIn PDF document text
    • https://windfreeklima.com/upload/ckfinder/files/24182691748.pdfIn PDF document text
    • http://usateatop.com/_upload/files/62563173268.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613606dd25e04---genikajenudi.pdfIn PDF document text
    • http://www.poliklinika-hb.cz/userfiles/file/jikojuponemaga.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/2ed77d8279669877bd98fc2321c763c4/69908134894.pdfIn PDF document text
    • http://sofia-es.tokyo/yamituki-n/uploads/files/lulowepivukunavanu.pdfIn PDF document text
    • http://technology-mp.it/userfiles/files/dupitamowadefupo.pdfIn PDF document text
    • http://bio86.fr/userfiles/fichiers/rotavasanutaduvoku.pdfIn PDF document text
    • https://smsenerji.com/resimler/files/zujimubemigixudon.pdfIn PDF document text
    • http://erago.cidees.com/uploads/files/wijelizulelotajawaru.pdfIn PDF document text
    • https://10s317.com/uploads/files/202109081719482214.pdfIn PDF document text
    • http://vizcsap.hu/files/file/mijixafexelavebesopivij.pdfIn PDF document text
    • http://hotelborgodeipoeti.com/userfiles/files/tuxufutaduxa.pdfIn PDF document text
    • http://dungcucaytrong.com/images/files/tamumidamebawojaxurumu.pdfIn PDF document text
    • http://ever0036.com/assets/uploads/ckedit/files/20210903050517.pdfIn PDF document text
    • http://hodinovysoused.cz/upload/file/23370410662.pdfIn PDF document text
    • https://marblobathware.com/app/webroot/img/files/2489697732.pdfIn PDF document text
    • http://porpora.group/imagenes/imagenes_contenidos///91795473897.pdfIn PDF document text
    • http://gyndoktors.de/ckfinder/userfiles/files/kilikitugorazijisatefubi.pdfIn PDF document text
    • http://espwireless.net/uploads/file/bedafejimuvekujodeses.pdfIn PDF document text
    • http://aokisuper.com/ckfinder/userfiles/files/vabomatimukotivetu.pdfIn PDF document text
    • https://hr-serdahel.hu/images/file/59232717375.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613602af8eb15---50610256212.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=boxing+tonight+tv+channelPDF 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_off0000e295.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE295 10460 bytes
SHA-256: d8bca1d0e4fd22a83e8ad97e06eedb35c8c52b982e4a84e8d73c61dcf212b650
font_01_sfnt_off0000fa5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001126e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1126E 18284 bytes
SHA-256: fc47422881e76dd864d38dfbb163257bd5ee4787255f58489025c93fad0cceae