Malicious PDF — malware analysis report

Static analysis result for SHA-256 04622df029c7d05b…

MALICIOUS

PDF

97.9 KB Created: 2021-06-26 22:47:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f35ea89f9227b1ca3a83c37288fed51c SHA-1: f7f967af1d15e050e7787221e2466c4de91f84e5 SHA-256: 04622df029c7d05be999ca9a555fbaa3397fb208ebf198c517037722cacebc91
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with multiple URLs pointing to compromised CMS upload directories and disposable hosting. The presence of numerous links suggests an attempt to lure users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160ba66a985437---lokobisumusipabefodixu.pdf
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ac37916e82c---lasomenizijikezod.pdf
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/c18aa668d09cee9934bf2270ce331491/kagoju.pdf
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/c46f5e6e0f5c68978f1005958fd2807d/baguzibememo.pdf
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b9b87abf5bc---13575677570.pdf
    • http://allamericannursing.com/userfiles/file/gasukepek.pdf
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/67fd7c54e6e757f74cc97af6c9edd6d2/79358340047.pdf
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c67dd73f833---29936676995.pdf
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/429d88170267642cf9d50ddb47f8f946/42220259064.pdf
    • http://allamericannursing.com/userfiles/file/95356300814.pdf
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609b856e2b8e0---sekuduzevedopoxadifaluk.pdf
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/b5ec0b46291e1baf683d80f6658de625/21022170464.pdf
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/54b7a09bcb92ec3452e2d6032b96cd97/86584303434.pdf
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b6cc48dbc06---romijogusemapixupix.pdf
    • https://asiarsolutions.com/userfiles/file/3629196980.pdf
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b47ea09430d---59581311401.pdf
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/c4dd8ab0ab30622a016ba7133ea2c869/7067912008.pdf
    • https://textosolutionslinguistiques.ca/upload/editor/file/fotivorodikasibakali.pdf
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1606f19c056729---wavifugoladuwakimedu.pdf
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609479263104e---64670422445.pdf
    • https://condominiovillage.com/userfiles/file/naveg.pdf
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca984073e5---87631818775.pdf
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160bd815946c1f---sipebijogajasesuvosi.pdf
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/ri9e2hj24dkr58n6mu2fms38t6/suwevovuviraxorililonil.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=large+investment+is+made+in+fixed+asset+the+project+will+be+termed+as
    • 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_off00011819.bin
2e84f6e2b384ba63b2175e45379d4adb68e1f969b4b7e2fcb044677c2f67553e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11819 17004 bytes
font_01_sfnt_off000144aa.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x144AA 16792 bytes
font_02_sfnt_off00015cc1.bin
4372200b8d1bd862675f75627d87c56bfc2f6437865c16ab87e57d163af719fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15CC1 11548 bytes

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