Malicious PDF — malware analysis report

Static analysis result for SHA-256 e47b388b6a02f93b…

MALICIOUS

PDF

86.1 KB Created: 2021-09-18 14:38:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 95a011af7560ae0ae9503acdb42d870b SHA-1: 19157c889a454f03140268038af1caecbfdfd10d SHA-256: e47b388b6a02f93b0dd1db30ab26ae5b7db9f96ff39a40a6d6a6c8ac0407cb75
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the presence of external URIs and compromised CMS uploads points to a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://cructi.ru/uplcv?utm_term=prayers+of+the+faithful+year+a+2020 PDF link annotation
    • https://e-room.co/userfiles/file/vavanakepijagod.pdfIn PDF document text
    • https://zagi.hr/files/ravaxazuw.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613755e034e97---80203988004.pdfIn PDF document text
    • http://pension-erlkoenig.de/img/editor/file/50874872662.pdfIn PDF document text
    • https://mariapolis.net/ckfinder/userfiles/files/48919592455.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/161307c3e3e42e---detusodagedufamakepefuvom.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140c14e5da9b---42626549418.pdfIn PDF document text
    • http://casavacanzesanvito.eu/userfiles/files/lanijofebodoginoparo.pdfIn PDF document text
    • https://dom4m.by/userfiles/files/7117716522.pdfIn PDF document text
    • http://portalinmobiliario24.com/uploades/fckeditorfile/tozexipamulofenab.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e3e320c9c3---49062684067.pdfIn PDF document text
    • http://slenderclub.cz/ckfinder/userfiles/files/29136770848.pdfIn PDF document text
    • http://laboratoriodiprogettazione-ve.it/userfiles/files/jefojopowe.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/16136c44610e94---22263081831.pdfIn PDF document text
    • https://rarahil.org.np/ckfinder/userfiles/files/puxufib.pdfIn PDF document text
    • http://savitapiti.org/ckfinder/userfiles/files/26344237796.pdfIn PDF document text
    • http://lotusburbank.com/uploads/files/20403812860.pdfIn PDF document text
    • http://peneleos.pl/userfiles/file/lupivedezuwipawinanufi.pdfIn PDF document text
    • http://4els.ru/uploads/images/files/tomulu.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16134f8e3a998a---38185844118.pdfIn PDF document text
    • https://sarna-zapiekanki.pl/ckfinder/userfiles/files/sabunujipewenawerepo.pdfIn PDF document text
    • https://shih-tzu.ro/files/file/20498123705.pdfIn PDF document text
    • http://canadianrockies.ca/files/file/guwamekogemigu.pdfIn PDF document text
    • http://newbiesites.com/userfiles/file/sajisenabajaxalegijumufe.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_off0000ecbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECBC 17668 bytes
SHA-256: 84956b15f9850d3c32dd0ee34ccd3a38e95e52351ebe885244e106939b649200
font_01_sfnt_off00011a09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A09 10664 bytes
SHA-256: cf065a8ae2fa1ff97ddb9b47f230ff5dd554f4407ccb292f4a57f0e9fe4ab5ed
font_02_sfnt_off000132b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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