Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f5972e93d295a3f…

MALICIOUS

PDF

76.1 KB Created: 2021-06-16 13:55:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c8d5cd872f03caabe6579a713d5e0ba4 SHA-1: 535c4b1b4b62867b30456bea77145df87dcf9b4c SHA-256: 4f5972e93d295a3fae8ed54f5ced0449e8d7236d7fd34d0ee854b37b74b7ab0f
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document exhibits characteristics of an advance-fee scam, using lures related to lotteries, prizes, or parcel deliveries to entice users to click on embedded links. The links predominantly point to compromised WordPress sites, suggesting a distribution network for malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the download of a second-stage payload via the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://crysiq.ru/uplcv?utm_term=watch+rupaul%2527s+drag+race+all+stars+5+online
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0129379056---24708142513.pdf
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/e9371f85fd25938a8d15a406615bfc0e/dutotokajapafoxilu.pdf
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/df859cdf5810d1309924433aff725945/68039128178.pdf
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098b7cb17b8a---11106200621.pdf
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/aup2b78er0c01h39fqhbn4m57i/8299356241.pdf
    • http://gulfcoolcontracting.com/uploads/userfiles/file/file/61723817688.pdf
    • http://fine-cottage.ru/userfiles/files/wabolutekuw.pdf
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a1175d52c51---5183598039.pdf
    • http://hakkabrothers.com/userfiles/file/%5C/tuxul.pdf
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160721da2dffdb---kexewoporowuledatukuw.pdf
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/qns968tar3algop6m0d5gobp4r/88027883418.pdf
    • http://quaretti.it/userfiles/files/movukufiluwelemike.pdf
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/b431b2b8518cc18351ec24854268122c/xepofona.pdf
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160869a43dc77a---gedejovedelikamunuxa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e947.bin
43abd5702fca39f7e0d8ae3c96c01993f12c7b37abfbf7243de7e83a11a34e6c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE947 5504 bytes
font_01_sfnt_off0000fc11.bin
94524282373c2d87d8a80ae891dd3b4d2b3fe002ab027c4eb9292661978c2e28		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC11 11672 bytes

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