Malicious PDF — malware analysis report

Static analysis result for SHA-256 97b67b8f61fb72d3…

MALICIOUS

PDF

67.9 KB Created: 2021-09-21 04:36:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 83c0063e75c969658f7de56c8fa54963 SHA-1: 3bd05321e79d0532e91d39ee246a146d2f1eb9a5 SHA-256: 97b67b8f61fb72d314ed3242013631ee36f9abfd4dbec928658e9d3e5a225636
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and link farm heuristics confirms the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9192

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://oniceh.ru/uplcv?utm_term=cxbx+emulator+android
    • http://celyroknaterase.sk/editor_uploads/system/files/62069921280.pdf
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/73524709655.pdf
    • https://brincandoeaprendendo.com/fotosempresa/files/37820020909.pdf
    • http://massimosusto.eu/userfiles/files/veragiret.pdf
    • http://tumwebthailand.com/ckfinder/userfiles/files/59939224845.pdf
    • http://www.museopizarra.com/ckfinder/userfiles/files/87014098406.pdf
    • http://nguyenphat.com/public/default/ckeditor/files/bawuloruzewipukexugux.pdf
    • http://status.cz/UserFiles/File/tupidaduso.pdf
    • https://bluetact.com/ckfinder/userfiles/files/86075922011.pdf
    • http://posicert.com/upload_fck/file/2021-9-12/20210912174945605942.pdf
    • https://armour-technoz-ca.otzol.net/ckfinder/userfiles/files/13769458598.pdf
    • https://www.temtechnologies.fr/ckfinder/userfiles/files/98105182448.pdf
    • https://anaksemut.com/contents/files/13125844319.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8sthqmtruab5bg38c2o6f0plt1/zemafejowedufilil.pdf
    • http://kuresi-kaitori.com/upload/content_pic/files/miwifimelivuve.pdf
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16148483404731---nekizudopokogesejenovig.pdf
    • http://kasaitogo.com/uploads/files/45729027236.pdf
    • http://cutyoursupport.com/userfiles/file/42079384855.pdf
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/ee78df1de29372923b9509ab901a2434/towetupurutawezade.pdf
    • https://asiastudy.in/ckfinder/userfiles/files/kodibamufeganaxowojejeku.pdf
    • http://frutapac.com/ckfinder/userfiles/files/fidixexetu.pdf
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c783.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC783 16792 bytes
font_01_sfnt_off0000df9a.bin
d77cce9199ff52e0a013dbd244b00e10eca8e897d1b0e693337d1d19fdd1fd80		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF9A 10616 bytes

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