Malicious PDF — malware analysis report

Static analysis result for SHA-256 6835306eb2220d8a…

MALICIOUS

PDF

78.8 KB Created: 2021-05-31 13:50:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c7bb9d0ccaacb8ef0a655ee7d5c30c60 SHA-1: eded52b88f3ec23bdded31ac51f399f7746eea6f SHA-256: 6835306eb2220d8a3faa4426df2cbaaca395dec64481bc3e62c5813e59903632
154 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress sites, indicating it functions as a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery through these external links. The presence of 'utm_term_redirector=True' further supports the redirection aspect of the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7074

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 http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608a7783c24ec---gamirejir.pdf
    • http://poltinik.ru/userfiles/file/18329538111.pdf
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/556eee61694622823702027480245c44/71519631220.pdf
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/1tur7377udb9l1lbtthrrq4gb0/96899699396.pdf
    • http://alibabashipping.com/userfiles/file/60250617923.pdf
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160822415bcd02---mogifetobekojarovanoxala.pdf
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607d59151e152---zawukeli.pdf
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160779e2a6deba---lovegumekijifuberifezedo.pdf
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607673680d28f---81241183078.pdf
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609126c9d7aa1---62517003046.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/it0p8ek1j2m21hbtkiqclt30i3/15704170546.pdf
    • http://dashoernerboot.de/userfiles/daruzegigepekobof.pdf
    • https://almoheetmanpower.com/public_html/userfiles/file/66885377390.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/iigahokhsggopqqd7qo1dg3b21/taguso.pdf
    • http://antifftech.com/uploadfile/file/%5C/2021051117012132.pdf
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/e85e42548ff4acd12f93f76bbcf4688b/ruzozo.pdf
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/71opmvd4ff474vktqlns0t7rq0/47297963317.pdf
    • https://bangprice.combangprice.com/beta/cms_image/file/30392963156.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=apprendre+l%2527espagnol+cours+gratuit+pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001019f.bin
cca2ba8083807f34300cd3638b0970dc12751b49e12d567f7db4f5a431b43b30		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1019F 5228 bytes
font_01_sfnt_off00011372.bin
8e46fd66a943dd28f7a15d34c8467d10e5b12e633cabb3112543cb96424ca344		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11372 12172 bytes

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