Malicious PDF — malware analysis report

Static analysis result for SHA-256 64888ab639170542…

MALICIOUS

PDF

83.3 KB Created: 2021-08-17 04:02:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8b0cfbae2c26880a70e054b3fffdb76a SHA-1: fb038abb4cdcb1b4d91682597a17da5c0deb6066 SHA-256: 64888ab639170542b1c3dfc1c0ff2f9f2ec6f5b31a5bc794126768f65cbccca2
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to various domains, many of which are identified as disposable or potentially compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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.
  • 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://vinamex.info/uploads/news_file/sefigoloj.pdf In PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160839fc674a66---tixez.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/zikakikeropifojawumamax.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a18d171e2d1---78604828730.pdfIn PDF document text
    • https://jamurgoreng.net/contents//files/vawoza.pdfIn PDF document text
    • https://senfina.top/uploads/files/74728870031.pdfIn PDF document text
    • https://hkfew.org.hk/ckfinder/userfiles/files/10495981494.pdfIn PDF document text
    • https://themis-lex.com/userfiles/files/51325723411.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/zunisawodogajuxajizuweva.pdfIn PDF document text
    • https://www.lire-les-notes.com/ckfinder/userfiles/files/vewotodopizewikevo.pdfIn PDF document text
    • http://donaldbermanmaimonidesgolf2021.com/clients/0/0d/0d43fbb8ff91cab41fa1b056c0d912a9/File/12439168394.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/xoxolisojumolev.pdfIn PDF document text
    • http://utuin.net/files/fckeditor/file/xikeja.pdfIn PDF document text
    • http://119pump.net/d/files/8810539979.pdfIn PDF document text
    • http://virtualcharityevents.com/vce_cake/files/files/funulelum.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/vuxuweniwapoxilefi.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb30723d015---subupufenu.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/makajetiv.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/lejalexex.pdfIn PDF document text
    • https://samsungvrvklima.com/upload/ckfinder/files/79297402865.pdfIn PDF document text
    • https://dauglita.lt/components/com_mijoshop/opencart/image/data/files/finidewidenavu.pdfIn PDF document text
    • http://curtisfamilyfun.net/clients/e/e0/e02f67ab5b6879a7eb6c21a3163f7106/File/16610622793.pdfIn PDF document text
    • http://shriramsteels.in/public/ckfinder/userfiles/files/jafasazufexuxoxonaripavo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=curricula+cisco+ccna+v6+espa%C3%B1ol+pdfPDF 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_off0000dac8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC8 11084 bytes
SHA-256: 8a07b9a9dba110183d341be0e35688329772d3acbd51f2e2c36b8d3f45197ef2
font_01_sfnt_off0000f483.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF483 19336 bytes
SHA-256: 4dbce44094158f686978d218c33157ee75f7b4f5a505ce717f0c2428bc61348e
font_02_sfnt_off000125ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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