Malicious PDF — malware analysis report

Static analysis result for SHA-256 d09914cf698c64f5…

MALICIOUS

PDF

104.7 KB Created: 2021-09-05 09:22:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 99d267050017eeed0432ce85412bfcd0 SHA-1: 27636ceb0ff6470a04abcda05ec7b3e15f26b7a9 SHA-256: d09914cf698c64f5d47845d1e14398104eba6b4a8b914a237b593a9db956a638
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and disposable domains, indicating a link farm or phishing campaign. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to SEO manipulation or directing users to malicious content. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or spamming operation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://crysiq.ru/uplcv?utm_term=catia+v5+tutorial+pdf+for+beginners PDF link annotation
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/l2g5p35uas2v81lodqimvl1nj0/35509668856.pdfIn PDF document text
    • http://ueros.fr/admin/ckfinder/userfiles/files/69515338538.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/66516749845.pdfIn PDF document text
    • http://1mosref.ru/ckfinder/userfiles/files/50772017184.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/waxepeveruj.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/ad496466ec5b5f1aa6cc82e7b7cc739b/lapewiwexobojane.pdfIn PDF document text
    • http://avatars.ru/userfiles/file/38077335766.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b20a0ad74f7---82263297563.pdfIn PDF document text
    • http://camionespanamericana.com/userfiles/file/womerakubezodagavotag.pdfIn PDF document text
    • http://quiltingacademy.com/fckeditor/userfiles/file/bololupolixa.pdfIn PDF document text
    • https://assignmentmart.com/ckfinder/userfiles/files/lamivenigi.pdfIn PDF document text
    • http://rayocazar.com/images/elfinder-1.1/files/file/88224834022.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/0d168156775a2d4258cd5b94984e38f1/kuduzudixejakotixobe.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f879d77adeb---74332691927.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/sojuxabevolonivomabun.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/5bf9d93003b5bf7b620939a847fdcfed/bibuwijerakazudizani.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1607191708354b---fukuxosogotimu.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/jh2ju5iamheqcjk0m16nnacc08/gitezadofodolu.pdfIn PDF document text
    • https://ski-experience-japan.com/images/blog//file/61596644384.pdfIn PDF document text
    • http://insureacompany.com/userfiles/file/juwuforugisewibosikixegaf.pdfIn PDF document text
    • https://www.loscam.com/lib_common/ckeditor/ckfinder/userfiles/files/89960250435.pdfIn PDF document text
    • https://onderdurdu.com/upload/ckfinder/files/35769162650.pdfIn PDF document text
    • 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_off000127e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127E6 22808 bytes
SHA-256: 8a1b9877d70c409f993b8bd62fa840c89915db7b0077773ff72a5703fc3ffbfc
font_01_sfnt_off00016328.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16328 11144 bytes
SHA-256: 4c5da7e67059616d9c968e9157fb6f416458a9379010eb7d41aa25eb343596bb
font_02_sfnt_off00017cfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17CFB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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