Malicious PDF — malware analysis report

Static analysis result for SHA-256 86f76a64ede7a633…

MALICIOUS

PDF

85.0 KB Created: 2021-06-29 10:55:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: faa5e2d4c57a75a559149fcfd8c09b35 SHA-1: 0b5fa40cb0896b792f3c48114caf77db07e29506 SHA-256: 86f76a64ede7a63357c8ba4b55a8866046e4227c3eb83c3c28ab95290b30488a
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress installations and disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The document's structure as a link farm suggests an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://medvor.ru/uplcv?utm_term=how+to+bench+press+more+weight+faster
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/cc10dba63e6e185c38a5a189fcad377b/foxadinesetigewapujorad.pdf
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085f150b43e5---kebugogomibilawi.pdf
    • http://grgct.com/ckfinder/userfiles/files/toxatufotorutagabakuku.pdf
    • https://ajitcoatings.com/uploads/pebobexitofedinog.pdf
    • http://gemculture.com/userfiles/file/gelakibusowizivodeva.pdf
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160878b9b328aa---43046399345.pdf
    • http://www.contectrade.hu/fckfiles/file/bewokuduxubijowupi.pdf
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d8c21836be7---20357989594.pdf
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b7091936f0---60610202764.pdf
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/ri321luj9diroulttgoqgedsap/36285953144.pdf
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083d38b51cc4---megenojup.pdf
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/6iplr8ummesf6iqep1cj6vi4ns/ropejakejibijediwag.pdf
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160aea99e05ef3---tibiresojiwas.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/aunhkpfaurlic4jgle2kko9go4/86177966089.pdf
    • http://3bbb.fr/ckeditor/upload/files/88216533322.pdf
    • http://immobilieninvestors.eu/userfiles/file/12738607485.pdf
    • http://thucphamchucnangmy.vn/uploads/files/99673258723.pdf
    • http://asustainable.com/global/file/76428121574.pdf
    • http://langfordfinancialservices.com/userfiles/files/61719136051.pdf
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/jusurifarapa.pdf
    • http://ahxxzx.com/userfiles/202105/file/pomexejemurubuxu.pdf
    • https://alatheir.com/atheirwsfiles/file/14481199298.pdf
    • https://ivanda-commerce.hr/userfiles/file/58440410409.pdf
    • http://www.hgbehringer.de/img/files/files/nizedowalamori.pdf
    • 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_off0000e9cb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9CB 16792 bytes
font_01_sfnt_off000101dd.bin
2bd49aacd9e98d904adbae0f15db398b21521b15672131a16c6a2a8abfe20de1
pdf-font-stream PDF embedded font (sfnt) at offset 0x101DD 16712 bytes
font_02_sfnt_off00012d54.bin
8a93df1e1f09058e181971e6cd9f5746ec43eb4bec204f7e2b5ab1e64fbcd618
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D54 11096 bytes