Malicious PDF — malware analysis report

Static analysis result for SHA-256 9af8e73b1bda7a7d…

MALICIOUS

PDF

423.2 KB Created: 2021-06-25 21:03:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: c5a0b74f9a6606c62a5f691c324df20e SHA-1: 9d99364086f4a19752cbeaa3c345e4857a89bcb3 SHA-256: 9af8e73b1bda7a7da364a074ef3d5fa3550c5ccbbe6b8c1055dcc44bcb3f49af
166 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating it is likely a phishing lure. The file contains numerous links pointing to compromised CMS upload storage and SEO redirectors, suggesting an attempt to lead the user to malicious content. The presence of embedded URLs and the overall structure point towards an exploitation attempt, likely for client execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7488

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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.
  • 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.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/sfho6q94g7qprm9mann8t0urui/gikirajejajaletewuxapuwum.pdf In PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-4-30/20210430083738985596.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a07f3b05282---62099657551.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/e891de6cdd252e61386703c0a5b19149/52279836667.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/0krp2vmsdnmn4mvaqj8kkc47gm/midixinulaguneralo.pdfIn PDF document text
    • http://americansemitruckparts.com/d/files/duxalibolodixop.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f046bc760d---modilo.pdfIn PDF document text
    • https://atamergranit.com/userfiles/file/pijemekedupobajanoruxava.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16087f567d070a---31230319766.pdfIn PDF document text
    • http://enotecagaribaldi.it/userfiles/files/pirozido.pdfIn PDF document text
    • http://iqlacpro.vn/emotive/upload/files/wemogujigapepafide.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609831ed0af4f---milalegixuke.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/3a0g9tcqd7sbe3ms7f88h4pgnc/99932427031.pdfIn PDF document text
    • http://atek-ent.com/upload/file/fugololako.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/2a77022242a303257a78023a80821ff9/xasewen.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609d2ec8ec396---zifasinevewofeweru.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085753662916---2487822037.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/3219ce7aa9ea9d4de0befee1403205d6/63586718075.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160851c6c61061---8366763210.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/3dvon9ndlqach4burargmcgj7k/xepeg.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/7e6a1c53d27d9a50005f8b78590dfa02/76519417369.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e91e21d1d2---kalasinovejibunozevuboge.pdfIn PDF document text
    • https://ancoraeducacion.com/images/jegomukixazadabusavoner.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=smacna+duct+construction+standards+pdfPDF 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_off00062694.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62694 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00063ea6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63EA6 19560 bytes
SHA-256: 390d21e59ce364dce65b7be552a5c2281047f999e869fd63258b36f8e494aa5e
font_02_sfnt_off000672fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x672FD 10780 bytes
SHA-256: 5e5249996739b2c62e2ba94b7d27e79be2934935491f1a243893d055d366b89c

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