Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcaef7ebf6001715…

MALICIOUS

PDF

87.3 KB Created: 2021-06-26 10:51:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c2d309ea5fe1fd2a38f0d500db9daf23 SHA-1: 90b9efee4b3dfb43c879be12bb7168ba466b784b SHA-256: bcaef7ebf6001715ff27cd48f7ad1c5a48e76bb2a8b97efdda80369d9e33a3db
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, suggesting an attempt to host malicious content or redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7595249c47---49332898101.pdf
    • http://yaqeen-eg.com/userfiles/file/31337356627.pdf
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/ad37a23633f7a291918b6350843601ed/kotoxemanukinifis.pdf
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e6be5b2de---48698347342.pdf
    • http://studiolegaletrotta.eu/userfiles/files/ladutetog.pdf
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/tv256mic5geqjsme5hp2sk32h5/17517269682.pdf
    • http://haai.org/upload/file/65840315216.pdf
    • http://broadviewlibrary.org/uploaded_bvlib/file/94856856449.pdf
    • http://teechart.com/uploads/images/files/sagebuvamizi.pdf
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/86e6b00d8d6dd605c611aa3f0d6b66a8/tofejerimim.pdf
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/4a01ab49be699721853725f5792f805c/geloboridemox.pdf
    • https://aspaeng.com/files/image/files/roviziguwolube.pdf
    • http://www.prieteniitehnicii.ro/documente/file/lunuwipopemapud.pdf
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/1jeot4m12o1c0hvueb0hi8gc9o/jokaruwebomozoziraxaxesu.pdf
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/tt51f0aebborjrrv268k7in9g3/jorewopejawixuwivem.pdf
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160afa43f04a03---24476170184.pdf
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9f11d4ccc---6388122489.pdf
    • http://eko-inwest.eu/upload/file/92604991024.pdf
    • http://planbmedia.hu/files/butinovovelavadoberotezem.pdf
    • https://fiberglasssupplydepot.com/userfiles/file/93765993421.pdf
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/qm7l8h4f5hkjtmgvtsu60kbv32/50272713430.pdf
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/49f93d50e901cdabaca5cb76d68ac196/43237782631.pdf
    • https://devcons.org/uploads/userfiles/files/xifososalatusowog.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=phrases+that+start+with+x
    • 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_off0000f3e3.bin
aeb14d46e86f02572de1e0518df4bb505f140751db7f3024d7e6ce183a99a205
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E3 17316 bytes
font_01_sfnt_off0001213a.bin
90ee5ad69cf3003a32dfc2653573c7e0e5da6a1d5ba54485235c30ca1c92ec10
pdf-font-stream PDF embedded font (sfnt) at offset 0x1213A 10124 bytes
font_02_sfnt_off00013810.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13810 16792 bytes