Malicious PDF — malware analysis report

Static analysis result for SHA-256 9052bc7e3465a02c…

MALICIOUS

PDF

73.3 KB Created: 2021-09-09 01:08:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e2f23a500599de7e59cddd843a449820 SHA-1: 51dcf9d27a36035899416f6a90360ab30b21c19f SHA-256: 9052bc7e3465a02cec324bf51a5a43dea33358ae9c02c8d2d038135d60d6b417
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. While no scripts were explicitly extracted, the nature of PDF exploitation often involves JavaScript for redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 https://chcial.ru/uplcv?utm_term=android+command+prompt+codes
    • https://dynasty888.com/image/files/20210905_132933.pdf
    • https://insolite.lu/img/userfiles/files/44998117244.pdf
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/92f2642263451f8bbb4f9e1621ff2254/kibilidir.pdf
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5abd68e46---fajowulaferaregavoz.pdf
    • https://worldcastlive.com/userfiles/file/ligiwobajudavaboz.pdf
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/21853771924.pdf
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/b6ab2d34dd3714feb9ce79b792079481/janekenedikitexol.pdf
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613354a64b3a6---gonopoletibuzok.pdf
    • https://ladangmimpi2.com/contents/files/47069534391.pdf
    • http://ipsaix.com/ckeditor/ckfinder/userfiles/files/puxedikotupufedov.pdf
    • https://terlickodds.cz/www/www/fckphotos/file/27516378857.pdf
    • http://nepalbestcargo.com/userfiles/file/76226260167.pdf
    • http://maquinandoysubastando.com/dleyes/admin/fotos/file/21107163608.pdf
    • https://cauthinh.com/luutru/files/13129110391.pdf
    • http://ctcinsulator.com/uploads/file/lenipomakejimonozigi.pdf
    • https://www.aaptuk.org/ckfinder/userfiles/files/lusapelid.pdf
    • http://ehomerealestate.org/images/file/97516344003.pdf
    • http://jamesandsons.ca/userfiles/file/jafunorufat.pdf
    • http://alphasigmaoverseas.com/userfiles/file/70524426973.pdf
    • https://www.agcontraincendios.es/ckfinder/userfiles/files/ranotafusigadut.pdf
    • http://citygclub.com/ckupload/files/pepanarutogumat.pdf
    • http://www.guus.edu.mn/ckfinder/userfiles/files/wupazotukoduzulojub.pdf
    • 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_off0000bb38.bin
62f314eed9c7220268376e79a085c77b717e8a1b385cb82c4902e89adcdf3717		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBB38 17072 bytes
font_01_sfnt_off0000e7d3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D3 16792 bytes
font_02_sfnt_off0000ffea.bin
41f4bd472d01b1b8864122f189305fc4476fa26f5bbabf8b650cda135a29d395		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFEA 10608 bytes

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