Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5b5db01c12495b9…

MALICIOUS

PDF

87.0 KB Created: 2021-07-01 10:31:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a6775c5c42fd7656c861994b8e476e11 SHA-1: 28db4d3eed0e0982f78aac208c53694cc4bae93b SHA-256: a5b5db01c12495b90e08fd1cd02219f8de5f97c242a4e1d2bea471c805963510
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users. ClamAV detected this as Pdf.Phishing.Trojan, and an ML classifier also flagged it as malicious. The presence of numerous external URIs and compromised CMS upload links strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/e20e09e6d39610276743b77d820a6ea8/kadafekomunol.pdf
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16080a3a91333d---64619586713.pdf
    • http://stalmost.pl/userfiles/file/lepimorabefilevuze.pdf
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abf4c7b81b8---24299676025.pdf
    • http://khanaphatgroup.com/UserFiles/file/xamujorasamiginifev.pdf
    • https://lasvegasrebath.com/wp-content/plugins/super-forms/uploads/php/files/d6600df1a089b178f0f8fa91baabc57c/povedawonovov.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/9d44ababc63f7d1848504a7d5b4e45fb/bujofepuxoxeriv.pdf
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a430d4e172e---4327581527.pdf
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/90d7aefe1d6dc6db8293a6a7ab11c615/waxawujibolopatoxijivufen.pdf
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160982e7976fd0---16648368013.pdf
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/cb4dd854e8c5a3b0df8abc6cc97ee8ca/37066541771.pdf
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16090c15de2fad---nawelexawegemaga.pdf
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/7o731rp37sar4khpljtojsfha9/xipapagexiwufatenuvovi.pdf
    • http://stjconsulting.it/userfiles/files/27909832659.pdf
    • https://bataretak.com/img/files/file/80209906140.pdf
    • https://a2designbg.com/userfiles/file/sesijizorelosip.pdf
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/9fc989e292da1ff78af7a0f426aa6c6f/93945308540.pdf
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608928e5caa65---rukugufodarexe.pdf
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/16098b15db4a12---2365670736.pdf
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9d5605d3b---74143255645.pdf
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/18fe5d79f07d2cff9e7cff3c9853121a/funelezofuzuwovolikenim.pdf
    • http://k1a.ru/images/files/file/50344495275.pdf
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/37c028d431790ff4148f9c1cd1154dc6/3311492670.pdf
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ac66ef23d---jifopilopinuxewefomologa.pdf
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/5d3977d1df4eb89d4df2200354ed1332/xovalosubefatus.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=find+maximum+value+without+using+aggregate+in+sql
    • 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_off0000efb8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB8 16792 bytes
font_01_sfnt_off000107cf.bin
34ebf41986e844851416990b00de697bb1e37b337ed03ede4ac04d7648b7cbd0
pdf-font-stream PDF embedded font (sfnt) at offset 0x107CF 11172 bytes
font_02_sfnt_off0001213d.bin
dc9d8a97d54f67ba9a7d2e9f9ae9b9ff34a8c7aaa4d57bdd88035829155ff340
pdf-font-stream PDF embedded font (sfnt) at offset 0x1213D 17176 bytes