Malicious PDF — malware analysis report

Static analysis result for SHA-256 c177d8fe03ebf5dd…

MALICIOUS

PDF

70.6 KB Created: 2021-09-28 09:31:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4ccbed77ccc3c6010446f26a3ce259dc SHA-1: bd2333fa9d98ca1825b426f4879b615dfb34a537 SHA-256: c177d8fe03ebf5dd843a827dc5e7a3292b4b3cd598c11b1eabf2556001b5608c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, including links to compromised CMS upload storage and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of embedded JavaScript points to its use in executing malicious actions within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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
  • 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
  • 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://philabc.ru/uplcv?utm_term=bike+race+hacked+apk
    • https://terracetemayonetim.com/upload/ckfinder/files/puzesoduwimuronapesup.pdf
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/a5a903c285b447b51c4e7d1e91b947b0/83299776818.pdf
    • http://www.aragonemprendedor.com/userfiles/files/5674516954.pdf
    • http://extintoresorigen.com/images/editor/rebiresiwisezuvatirip.pdf
    • http://epoch-making.jp/js/upload/files/65730384513.pdf
    • http://tartak-monis.pl/tartak/images/file/xoref.pdf
    • http://synthecinter.com/userfiles/files/konobep.pdf
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf9b122291---lividojimazu.pdf
    • https://tekmaker.com/upload/files/7005813555.pdf
    • https://zapcdn.space/web/img/podborky/files/64623152628.pdf
    • http://8njl.com/userfiles/files/bepulozamutoxeligopoluvom.pdf
    • http://belean.pl/userfiles/file/74833199083.pdf
    • http://ph-easycome.com/userfiles/file/kesivusasoxulifuk.pdf
    • http://topp.pl/_topp/file/zufuwoziwoguwebogugiboboj.pdf
    • https://hsse.cl/files/76825293190.pdf
    • http://seasonsblinds.com/uploads/ckfinder/userfiles/files/wepekuvapakori.pdf
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d9fe12ba29---80628045599.pdf
    • http://balletpanov.com/uploads/files/56312878737.pdf
    • https://apexsafetyproducts.com/ckfinder/userfiles/files/63359935753.pdf
    • https://pmsp-me.com/userfiles/files/24351808986.pdf
    • https://mbzgogo.xyz/web/img/podborky/files/dafulav.pdf
    • http://patanamachine.com/imgUpload/files/63339405783.pdf
    • https://jeevandeepspecialcare.com/ckeditor/ckfinder/userfiles/files/16756869976.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_off0000b2c1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB2C1 16792 bytes
font_01_sfnt_off0000cad3.bin
b2caac6403ef7d6f3e8b93e94d72c90c6a6ed5be5bda84ff986db9113bb108c6
pdf-font-stream PDF embedded font (sfnt) at offset 0xCAD3 16856 bytes
font_02_sfnt_off0000f58b.bin
cbed4cd942388dbc9eb832e3a5078ac012101dccb6db9c1fe111bbd567e1f8b4
pdf-font-stream PDF embedded font (sfnt) at offset 0xF58B 10220 bytes