Malicious PDF — malware analysis report

Static analysis result for SHA-256 461dd38526edda8a…

MALICIOUS

PDF

85.9 KB Created: 2021-09-17 03:22:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 53d740fb9a8d9b6d4ba19868bcd05395 SHA-1: aada9e8e298faba97773f2f633e1872ec34144ce SHA-256: 461dd38526edda8aa18d8cf30a154faea7264714f2aa2f97d350388a1ae26dcd
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to disposable hosting and compromised CMS uploads, suggesting a phishing or malware distribution scheme. One URL points directly to an IP address, further indicating malicious intent. The ClamAV detection and ML classifier strongly indicate this PDF is malicious, likely serving as a lure to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://tachikawa-derma.biz/ckfinder/userfiles/files/87336885029.pdf
    • http://big-blue-bus.com/pics/fotos/1/file/pofititakal.pdf
    • http://mikomisushiwc.com/uploads/files/82539958740.pdf
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/batakibibupasesepufi.pdf
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/volakaj.pdf
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143c8c26e854---pimudedanonebumorakefabu.pdf
    • https://dreamscapes.ca/dream_scapes/userfiles/files/69069080434.pdf
    • http://mya1fc.com/files/ckuploads/files/75021715803.pdf
    • http://abwlargo.com/uploads/files/19800022954.pdf
    • https://ipekyolumedya.com/resim_galeri/file/sopunej.pdf
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1613048d628621---27933097272.pdf
    • http://werkschoenenverkoop.nl/images/docman/files/86558470168.pdf
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134a50a0b4dd---pagugopifuxemik.pdf
    • http://tonyprins.nl/images/uploads/file/49475431905.pdf
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e5301f312---51634421994.pdf
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/16143d06267705---97330922526.pdf
    • http://aromamahabaleshwar.com/ckfinder/userfiles/files/gogofuw.pdf
    • http://twgo8.com/uploads/base/files/202109122309066267.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=fortnite+mobile+download+apk+obb
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ead5.bin
87ef65e6e9f82afaa1dafc3802775a71bc90e6ee270c0cee1c4bb319a323f6cd
pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD5 18140 bytes
font_01_sfnt_off00011a2c.bin
61e2416b578929c6e3fb97fc6f7767dd32e1c7e97b3684bb63ef7714759575ce
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A2C 10680 bytes
font_02_sfnt_off00013268.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13268 16792 bytes