Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0c5456de1703aec…

MALICIOUS

PDF

77.4 KB Created: 2021-09-19 17:54:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 22701ce47cabbcc6c8d6a07ec476f07a SHA-1: c0786857f51478c80eacefb2e0c16fcb34d792c4 SHA-256: c0c5456de1703aec9d6dc446cf4322841a20bb2bcaf0d2febd125276c84f89c0
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains a link farm pointing to multiple URLs, some hosted on compromised CMS uploads, suggesting an attempt to distribute malicious content. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway scanning.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://studioindelicato.com/userfiles/files/mejipifagatinirorefujoda.pdf In PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/16140903c5f506---demininunulijuwije.pdfIn PDF document text
    • http://kunbot.com/upload/files/8295011597.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7a2b14b92---88981463345.pdfIn PDF document text
    • http://tahi.hu/ckfinder/userfiles/files/fupaxej.pdfIn PDF document text
    • https://franchise-vietnam.com/app/webroot/img/files/wiranoz.pdfIn PDF document text
    • http://keyday.ru/files/files/siduvatadiragawowev.pdfIn PDF document text
    • http://bresky.cz/res/file/54480085085.pdfIn PDF document text
    • http://obchodsezlatem.cz/upload/files/vigeminerodezoliw.pdfIn PDF document text
    • http://cybernet.asia/UserFiles/File/25077120775.pdfIn PDF document text
    • http://chongthamphucthang.com/images/news/files/zetajeluwabukunomikibir.pdfIn PDF document text
    • http://railwaysrailroads.com/upload_files/files/26412193653.pdfIn PDF document text
    • https://ce-mi.pl/uploads/userfiles/files/vubakijovazajatosazamedez.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ec5315e45f---kogugem.pdfIn PDF document text
    • http://tgtech-auto.com/userfiles/file/83662011784.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161379311c4949---vulidodewamewi.pdfIn PDF document text
    • http://kozszemle.hu/uploads/files/xumod.pdfIn PDF document text
    • http://korvet-sp.ru/userfiles/file/53398600650.pdfIn PDF document text
    • https://atlanticcompact.org/userfiles/files/kiworomuzifit.pdfIn PDF document text
    • https://tipresentoio.it/images/file/53139679810.pdfIn PDF document text
    • http://asirakademi.com/resimler/files/36031259268.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=android+6.0+download+zip+filePDF 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_off0000ca35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA35 10708 bytes
SHA-256: 5ec0d7102a57f3b5a1932488a9004dc90515d6a68a7b159a8425fcb874add81b
font_01_sfnt_off0000e2f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB04 17836 bytes
SHA-256: ca9465021f3e76d2d816dbd6f55393a7a555974f76616cb4306adcaf9acf3f00

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