Malicious PDF — malware analysis report

Static analysis result for SHA-256 64b1670142ceec8e…

MALICIOUS

PDF

72.3 KB Created: 2021-10-05 21:51:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 857bb53b397b959516d58e1d37bada98 SHA-1: 5e13418bd473a32885b266504936d567e3b945b6 SHA-256: 64b1670142ceec8efde0ec742964177a0be62fe5d59115f94f6a8ea0326ecbd6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to various domains, including those on compromised CMS platforms and disposable hosting. The presence of these links suggests an attempt to lure users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://archism.ru/uplcv?utm_term=clear+food+stuck+in+throat
    • http://nedvizhimost-v-sharm-el-sheikhe.ru/uploads/files/49138296084.pdf
    • http://isystemlab.com/admin/ckfinder/userfiles/files/27141162268.pdf
    • https://geya99.com/ckfinder/userfiles/files/46841719213.pdf
    • http://morard-mcf.fr/data/Files/90189886244.pdf
    • https://krygina40.ru/UserFiles/File/ferokaniwenalutumiporot.pdf
    • https://carparts-fixture.com/file/file/9041792749.pdf
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161596adcda316---42748680854.pdf
    • https://people11people.gr/uploads/File/16563692488.pdf
    • http://lakesnwoodskerala.com/uploads/file/46007896941.pdf
    • https://shivajigrihnirman.com/singhania/downloads/file/91492954318.pdf
    • http://georgewongdesign.com/gwd/upload/files/43967547890.pdf
    • http://koovappadyscb.com/ckfinder/userfiles/files/zumikowasuselofepaxu.pdf
    • https://nvsrolko.org/ckfinder/userfiles/files/20869448928.pdf
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d1bf03a116---razasebefaselolu.pdf
    • http://marinapogon.pl/upload/file/zikiwolibuviroxoxo.pdf
    • http://abwessex.com/uploads/files/ruxuzafarorijerewasozife.pdf
    • http://tonwen.org/userfiles/file/mojepewejalomirenubepexom.pdf
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/63661309516.pdf
    • https://ltes.tw-goods.com/UserFiles/files/mivirikusovujabojuvas.pdf
    • http://otohyundaidanang.com/uploads/image/files/26604532867.pdf
    • http://superfishinglewood.com/uploads/files/36965757479.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/94ef6d9d827b66c3fc69d4fa240e88b9/78593094385.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_off0000b885.bin
dbc2225ff5487046604cddb36d6e20b584965873adbe216323f5d8ea6bc31a2f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB885 16576 bytes
font_01_sfnt_off0000e2d4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D4 16792 bytes
font_02_sfnt_off0000faeb.bin
2e31aaef83db29b6bcd33ac46024f8bcc646c52ecb219011d49cbb4b75a27961		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFAEB 10796 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.