Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b15c01ab7bf9f23…

MALICIOUS

PDF

82.9 KB Created: 2021-09-15 10:53:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 268a9c2eeb13a6a1e490e474fe3d7b12 SHA-1: 946b521602b9461fba05ff89222a2d57819772d8 SHA-256: 5b15c01ab7bf9f23ce0cbf93997cf390e7109c3a65c584e80ce3e43c79896408
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/f6eba5e37eb4b66d4a7030750846ce42/dofisupogegobifekumexejaw.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/i0mhf7djbjsu8draoknl8kvds0/43996753606.pdf
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/6d64d598ca9ff67ca6ea862cf8ea3595/juxuwuwunibasibi.pdf
    • http://aksaaydinlatma.com/img/editor/image/file/pudibujivupupo.pdf
    • http://clainvest.pl/userfiles/file/mojikekivubix.pdf
    • http://firewheels.pe/userfiles/file/vewafunipekuze.pdf
    • http://smcertificationservices.com/userfiles/files/41930894412.pdf
    • http://www.biogreeno.com/cms/ckfinder/userfiles/files/79596652486.pdf
    • https://stepweystudy.com/ckfinder/userfiles/files/95793008091.pdf
    • http://discus-rus.ru/upl/file/64481888097.pdf
    • http://all-paca.com/ckeditor/ckfinder/core/connector/php/uploads/files/kumupitewo.pdf
    • http://cbstav.cz/file/guzitiwasisijekomuvetisa.pdf
    • http://sacmacbook.net/userfiles/file/wiguvum.pdf
    • http://problemconsulting.com/img/download/files/32640982880.pdf
    • https://futurefacesmiami.com/uploads/file/silukafoxijez.pdf
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/db231a551fc2da6a519df701f782d758/zadoxepajorokor.pdf
    • https://zohopin.com/calisma2/files/uploads/50758405699.pdf
    • https://eldorado777.ro/upload/editor/file/89416094596.pdf
    • http://montazenabytkupraha.cz/files/file/bepopomeniguvoruxotodot.pdf
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/41432602707.pdf
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141639a5154d---83344306810.pdf
    • http://bluekeydigital.com/images/pic/file/68101453485.pdf
    • https://xn--80apefbdm9ah5g.xn--p1ai/userfiles/46025284700.pdf
    • https://perfumes.dropship-tracking.com/userfiles/files/javuzi.pdf
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/fab15b2767ccdd8234fc932a25ac6101/jideweres.pdf
    • http://huzatfokozo.hu/editor_up/ditatilokaret.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=vidmate+download+play+store
    • 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_off0000e0aa.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE0AA 16792 bytes
font_01_sfnt_off0000f8bc.bin
92d478bc43c00578e46f9c8da74adb5ff34db4627855f9166ef41ddfc41e8b01
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8BC 17212 bytes
font_02_sfnt_off00012539.bin
039fe64eb89eece3e139f116598b452f2385e58e073afb30fc4e31c0d58209d9
pdf-font-stream PDF embedded font (sfnt) at offset 0x12539 10720 bytes