Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f342883dc8723dc…

MALICIOUS

PDF

89.9 KB Created: 2021-08-14 01:58:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 33dc9bd2869c0a82dfa11c76e25f566f SHA-1: cbf70052a93d160270cf44a316f94ec78a2670e7 SHA-256: 5f342883dc8723dc7befc7332493d0f220a6f3e157345fa4bfc7fb246259001d
156 Risk Score

Malware Insights

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

The PDF document contains a link farm directing users to multiple compromised websites, likely to host malicious files or phishing content. The ML classifier and ClamAV detection strongly indicate malicious intent, with the document acting as a lure to external malicious resources. No scripts were extracted, and the document body was unreadable, but the presence of numerous links to potentially compromised CMS upload directories points to a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077f0c7612db---gifogobavizikafikimumalu.pdf In PDF document text
    • http://packamate.com/userfiles/gamuwowavovu.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b59a399883---42289623110.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/fef2177fdb38514eeaf31e224668eed5/6627141760.pdfIn PDF document text
    • http://bigband-ulm.de/userfiles/files/polexemotoxiwet.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/e4bb7d3b30ad1b4420b684f720a4ebf2/zuguluxirites.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160ddcd21943e0---muvugapidugaxiliva.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/1caf6a8753f06c50739fa6dfef3be4f7/vojivo.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/64d6c303cbf28a03a8f04a7ef93c76a9/94599776585.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/45957957456.pdfIn PDF document text
    • http://jnafarms.com/clients/864068/File/junoraboxo.pdfIn PDF document text
    • https://semagro-msw.ru/pics/images/file/37468854349.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cef3472371---75618784607.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/tababivuberuwivozoz.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4c10a8d1c185acaea9ad95fef1ff885b/bifazuwujibina.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/16111109d3daa7---sikebosidoxalonipolos.pdfIn PDF document text
    • http://veterinariacasettamattei.it/userfiles/files/75754008330.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1606c9e42cc3ec---11524653707.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/92885832c142395ed2f8c85f081bd12d/pukigil.pdfIn PDF document text
    • http://bbfederico2.net/userfiles/file/papewikofezozosegamiva.pdfIn PDF document text
    • http://boxshop.mn/userfiles/files/70007368282.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075bc542cafc---tisojujoxavosebovivopo.pdfIn PDF document text
    • http://fiumaradelsossio.it/userfiles/files/nanovatetegose.pdfIn PDF document text
    • https://clinicscrm.com/img/files/4629017257.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/5a63592e7a5970996a236c055f70ea5e/lumiwawosu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=abecedario+para+imprimir+letra+por+letra+mayusculas+y+minusculasPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f63e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF63E 18616 bytes
SHA-256: 85ca580600e1cd15fdc8a44c9a6cd5e8aeb1723ffd2b4aa043c524fba5987cff
font_01_sfnt_off000125ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013de1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DE1 11008 bytes
SHA-256: de11fe29f77f8bce7237e53f7abe6f9c8e8ff8bd035d1e8d02a3060c04a0db6d

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