Malicious PDF — malware analysis report

Static analysis result for SHA-256 24cc606ea0a03e10…

MALICIOUS

PDF

80.3 KB Created: 2021-09-02 20:01:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2b0f210e15d5a871e7efb77519774123 SHA-1: ca473f147eb6f1f46443874a0a530c26ecf84906 SHA-256: 24cc606ea0a03e10ee08b4614ecaa30d055c961925ba0a6459a883fa62f16892
96 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised CMS upload directories or disposable hosting. The ML classifier strongly indicates maliciousness. The primary function appears to be acting as a link farm, likely to distribute malware or engage in SEO abuse, rather than delivering a direct payload from within the PDF itself.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 5

  • 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://superazs.ru/images/news/file/jimetomo.pdf In PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/bguj0omcsrli1qec5i22im88m5/ruwalajevuzepijet.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1606c91c0bf0d4---bewotadoka.pdfIn PDF document text
    • http://assytekservizi.com/userfiles/files/vuwipanukirefuwoxid.pdfIn PDF document text
    • https://ariaparvaz.com/basefile/ariaparvazcom/files/21404340372.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3113aa6d15---34617211391.pdfIn PDF document text
    • http://twfbs.com/ckfinder/userfiles/files/8209412731.pdfIn PDF document text
    • https://drsubhashawale.com/ckfinder/userfiles/files/falepapapezakanivij.pdfIn PDF document text
    • http://interel-rus.ru/test/sites/default/files/file/sexagopukifebinawubaretam.pdfIn PDF document text
    • http://goldia.cz/data/file/tigof.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160744208c4b1d---jakeratanorukinazanopa.pdfIn PDF document text
    • https://ofertaromania.ro/ckfinder/userfiles/files/jitiruzepe.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/1424888252.pdfIn PDF document text
    • https://bearings.vn/images/ckeditor/files/nolefogul.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/49d1748efc9ea70c2e89bc7c05b16b12/jawativemal.pdfIn PDF document text
    • https://paperland.bg/uploads/file/xanasuvejipixosinedobe.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a779f2035e7---76125420552.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/q2oop6t8qglc8lnfg40s69a2rl/31406968830.pdfIn PDF document text
    • http://vanharteyoga.nl/uploads/files/batuwadejikenidefijed.pdfIn PDF document text
    • http://www.sospapa24.com/lib/ckfinder/imgupload/files/pegerufomokorelijavutowew.pdfIn PDF document text
    • https://sakkestadbil.no/userfiles/file/21312806246.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/unfucgo52m0pee78jmo0frnia4/22007975299.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16090d7f98fa7c---gowonolexitiwetotodi.pdfIn PDF document text
    • http://tsradviseurs.nl/mailing/images/photo/file/67461394546.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/9e27eb17ef8e159efc3bf193aed96838/bibuvafixoli.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=maquina+valetadeira+manualPDF 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_off0000d1f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1F5 10424 bytes
SHA-256: 2a1e9631ef56aaded81add584225cc0bdc6ffa28795711680896dd418e05b30e
font_01_sfnt_off0000e94e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE94E 18984 bytes
SHA-256: ed956c6760c53b7c6069077fcede94b8dc9d266ec331565c3901c24bdc512773
font_02_sfnt_off00011a7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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