Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cff5c54d797bbe7…

MALICIOUS

PDF

91.2 KB Created: 2021-07-05 06:32:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2bffba3537f6406cea409cc51ba34d3c SHA-1: 866586e23d6e15af578969321be640778227cd61 SHA-256: 3cff5c54d797bbe7a58a643f9bc3e325c9511fea648b5730465d94071e77249c
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to phishing sites or download further malware. The presence of multiple distinct hosts and the use of UTM parameters in some URLs further support a phishing or distribution campaign.

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://konditsionery-reutov.ru/upload_picture/file/79622796751.pdf
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b661dd61263---4793789220.pdf
    • http://msinziniering.com/userfiles/file/63302827441.pdf
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/51b9751b18df45b3a16e1b2eb95f1058/37607298983.pdf
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/f909debb93d839794bb6aee22cd46bab/81960975689.pdf
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160b7c9b390c94---88993496696.pdf
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077cab2bb4bb---giwotapiri.pdf
    • http://www.cerel.eu/images/wyswig_images/file/bunopono.pdf
    • http://yule-sign.com/upload/editor/file/20210612153619.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6a799416d.pdf
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f2a7adbe9---79752469381.pdf
    • http://www.annaleehuber.com/content_files/file/9716866221.pdf
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160abb63424a99---65171575244.pdf
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c92237a658b---vuzufuximoxakakutigawaz.pdf
    • https://asiarsolutions.com/userfiles/file/28965877782.pdf
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7fc804e13---91447992078.pdf
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608abde3a7922---megodamagezaxifu.pdf
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608044c24cad2---30325593444.pdf
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092fffd5daa2---62498324683.pdf
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f23ea06100---98076202213.pdf
    • https://zegabilisim.com/calisma2/files/uploads/nenunamabozupi.pdf
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a3ba1ca8b51---wofamul.pdf
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/djir2nkq8l4722rjlbh8f51fm6/wuposoximi.pdf
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/nk9gj092vch9sc1jmogcu69343/dozojapofato.pdf
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/lhdrg31kbap94etg5hk6s83jl5/pojet.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=the+legend+of+zelda+the+minish+cap+nintendo+game+boy+advance+rom
    • 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_off00010009.bin
5e4460c61df3c06a4915df8cfa3fdd2b4ed3eec5d8f8d47b2f55e5b0fa7ad9c5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10009 17064 bytes
font_01_sfnt_off00012c60.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12C60 16792 bytes
font_02_sfnt_off00014477.bin
8adebe9a5c0ce92e6e57a2ea1d2977fe893d11dbe151c631e42707b483bbf917		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14477 11408 bytes

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