Malicious PDF — malware analysis report

Static analysis result for SHA-256 23cbae977a3ff6a5…

MALICIOUS

PDF

86.8 KB Created: 2021-07-20 20:35:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e5baf79fc7570091cb9e089643261b25 SHA-1: 36f0b62c6edc7402f5960646fce77ef33f08b46d SHA-256: 23cbae977a3ff6a5143e83edc14593fa5259076c1190ff88d5e8f819ffe077a8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to exploit user trust.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/49e2e2164046b621c434126101466b19/86541589294.pdf In PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/cgo9kdec5bdmabjci2vul7rfl5/xabowat.pdfIn PDF document text
    • https://ntct.dz/ckfinder/userfiles/files/turagozuwajavujafajetaro.pdfIn PDF document text
    • http://luxmeterthai.com/ckfinder/userfiles/files/53977227303.pdfIn PDF document text
    • http://malopolskiszlakwinny.pl/upload/File/dudeposowavupadoti.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7345443800---batazagixusij.pdfIn PDF document text
    • http://jun-travel.com/userfiles/file/xelemozezo.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b94c9ef3897---zoxuv.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b188623ac68---vubuxaxomiwipodorusonowaj.pdfIn PDF document text
    • http://hrt-foto.hu/_user/file/27980741289.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/5p5qo92q094hbq02m2afukqi93/70754229520.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7b4ece8aeb---16469581662.pdfIn PDF document text
    • http://renovator.cz/files/file/45649489308.pdfIn PDF document text
    • https://terminal.hr/userfiles/file/rofudero.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608967b6c7576---79853072766.pdfIn PDF document text
    • https://asiabiru.com/contents//files/moduxesixovojarixunebel.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/sldpofuiv1d01kjigkktu9r5ch/49551037654.pdfIn PDF document text
    • http://phayaotechno.com/UserFiles/File/nugifaliloforex.pdfIn PDF document text
    • http://bethtikvahevents.ca/clients/2/20/20a91c0cb94b02964b0d1c5d980f1596/File/vupiwosapomevodexolaguv.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7611bd5774---gogagonodejefekuwisexa.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160b14f1c5512d---16719735490.pdfIn PDF document text
    • http://cozycornerexpress.com/uploads/files/pikejarafunedif.pdfIn PDF document text
    • https://fo-prefectures.com/pages/files/65445556509.pdfIn PDF document text
    • http://esistore.be/userfiles/file/35244518687.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=epson+printer+manuals+downloadPDF 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_off0000ef62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF62 10720 bytes
SHA-256: adf3046f3ffd43a38fffbd68fd27665c1ec331dc8db86272cd3f093bb09c67fd
font_01_sfnt_off000107ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107FF 17640 bytes
SHA-256: fb1f29932be3dcc7b7d3ada0bd786e63383a94cfd2304eba0bf91558ce9a81d2
font_02_sfnt_off000135db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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