Malicious PDF — malware analysis report

Static analysis result for SHA-256 35f34f99ceabdde9…

MALICIOUS

PDF

94.1 KB Created: 2021-06-30 14:30:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2eb980441d9e480feff2ee2727265cd5 SHA-1: cbe59d70111d9d19a98c979af351147fa8de945d SHA-256: 35f34f99ceabdde9b20ce2a6f21d02194be1e4096d3ecdf9221bd87a3f6a310a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as hosting for further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to lure users to malicious sites for phishing or malware delivery. No scripts were extracted, but the structure suggests a link farm designed for initial access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160abef32e8cdd---53026493021.pdf
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/451e29c5983aab04fa2d0ab585f3f210/gifuge.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608271cf11394---28505337171.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/d21f5e279edd090eb10725a247cf020c/lupudaloxada.pdf
    • http://superfishinglewood.com/uploads/files/revoza.pdf
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160832e67486c0---39325869517.pdf
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/4402b7bc8311d0b8db70d586e149f905/gowavamison.pdf
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bc7173514c5---mapadiwipukej.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/f46ebca3d8aec6e2f92b2fb440e12f90/49691112169.pdf
    • https://la-klamm.org/Files/files/piparimogikenude.pdf
    • https://tort-art.ru/userfiles/file/bovun.pdf
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/3025d924b88066540f94163e1027de43/sokagon.pdf
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b4093f970d8---9105151155.pdf
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160dc27bab625d---91475631914.pdf
    • http://hondaotohaiphong.vn/upload/files/xixulerepejog.pdf
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608d348c2218d---ginumewevodov.pdf
    • http://redfordunion70.com/clients/869360/File/97031250544.pdf
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a601b75896---desut.pdf
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7a163db0b---97830837289.pdf
    • https://spacio.hk/attachment/file/kafawutugi.pdf
    • http://candybeauty.vn/upload/files/gebediledeludapapurade.pdf
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/e1bruhvhv9am8ibqittc84ifp5/tagibevaxebizu.pdf
    • http://best-infosystems.com/userfiles/file/72921048004.pdf
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160774a429725a---revawexuderilufifenazo.pdf
    • http://zulassungsservice4you.de/bilder/file/86953832495.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=complex+sentence+with+relative+clause
    • 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_off0001099a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1099A 16792 bytes
font_01_sfnt_off000121b1.bin
dcbcd92fa1653f99122e141796d1d6beea8131f48bba64c422183cea362b7842		 pdf-font-stream PDF embedded font (sfnt) at offset 0x121B1 11024 bytes
font_02_sfnt_off00013b36.bin
ef30bf9bbc4ebf4aef47c23c7316eb2eb0641bafe7d4a1a81d8d34523128628d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13B36 17660 bytes

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