Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f05c0d5d133ad5d…

MALICIOUS

PDF

65.1 KB Created: 2021-10-13 04:26:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: b06e0ca1544432acccfe5e3f02afb52f SHA-1: d4706fb0d557076bf91ce6054a84fbef2b1e9fc5 SHA-256: 3f05c0d5d133ad5defeb5b9efd9c25e5e50a12a8308c8b30ecaff90699d76dfa
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. Several heuristics indicate the presence of link farms hosted on compromised or disposable domains, suggesting an attempt to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7681

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613e14a70ed5f---wafisubege.pdf In PDF document text
    • http://dopuskvsro.ru/UserFiles/xagujuzarunad.pdfIn PDF document text
    • http://webinaris.eu/ckfinder/userfiles/publics/files/wilomumiwusefizokel.pdfIn PDF document text
    • https://stradatextiles.com/upload/ckfinder/files/pokixuritakite.pdfIn PDF document text
    • http://6nergy.fr/6nergy/sites/default/user/file/kejupoviwizagubopar.pdfIn PDF document text
    • http://eyupsifalibitkiler.com/resimler/files/kefidozivujom.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/fc0eaf4667cd0ea99745c8d081d4639a/bosadikozujisiv.pdfIn PDF document text
    • http://chekeeh.ir/basefile/chekeehir/files/fosobolerafalixo.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161429fa449d3a---gimareromebi.pdfIn PDF document text
    • http://ydchem.cn/filespath/files/20211003181947.pdfIn PDF document text
    • http://jun-travel.com/userfiles/file/ripepoveti.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/84907374938.pdfIn PDF document text
    • https://kueapem.com/contents/files/25050545579.pdfIn PDF document text
    • http://vilocom.net/webroot/img/files/9851097967.pdfIn PDF document text
    • http://autofactory-jin.com/js/upload/files/18500246233.pdfIn PDF document text
    • http://ugrctrani.it/userfiles/files/72164895993.pdfIn PDF document text
    • https://beautydent.hu/editor_up/15473454992.pdfIn PDF document text
    • http://srs-budapest.hu/uploads/files/jeviki.pdfIn PDF document text
    • http://imaginove.eu/data/Files/88416573620.pdfIn PDF document text
    • http://asqcert.net/files/files/lukinuvafiwen.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/xPAns0MRe5M/uplcv?utm_term=sd+card+unsupported+fixPDF link annotation
    • 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_off0000af89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF89 10844 bytes
SHA-256: 0753f42dfda32476dd0bea964e4a917ba5731db96ee65c78c1db065501d1e556
font_01_sfnt_off0000c8af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8AF 15560 bytes
SHA-256: 0d6e41dd13c954c183f7d326235fe5bb4d0089a676e78259a8765d8a1916289d
font_02_sfnt_off0000f036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF036 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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