Malicious PDF — malware analysis report

Static analysis result for SHA-256 4afa2393d64320c3…

MALICIOUS

PDF

91.5 KB Created: 2021-09-04 01:33:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 26dd93ff73e696165ac726336e52c1f8 SHA-1: 82aa9c0efdc3b9d0b8ddfe5ea3400e593e375b32 SHA-256: 4afa2393d64320c36e690ae2a4dfa876dd3fdaede7da22f395139368f5151fe3
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting it's designed to lead users to malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. The document body is heavily obfuscated and unreadable, providing no direct user-facing content but reinforcing the nature of the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608a0d5cb4a99---gasudekul.pdf In PDF document text
    • https://get-insurance.in/ckfinder/userfiles/files/munuwinemimugamavonu.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c2d8220a63---kojubamixarineledep.pdfIn PDF document text
    • http://www.sas.edu.mn/ckfinder/userfiles/files/73914882828.pdfIn PDF document text
    • https://pointvirgule.ca/upload/editor/file/44353710861.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609e35119b8d3---46975334229.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/3d52b42a140445fc121dac378fc7ec2a/najarumafevoja.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160928fd9b4aaf---15522448074.pdfIn PDF document text
    • https://tectrongim.com/uploads/files/nidisulutuwolivira.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/trklofii5lj2pnrlgqn5h2smqf/zipowizefibabozuruzam.pdfIn PDF document text
    • https://majubesar.info/contents//files/67064392432.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/fb2f5234b1bd7bb98edf8a031353e61f/9872758436.pdfIn PDF document text
    • http://turystyka.powiatlubartowski.pl/admin/ckfinder/userfiles/files/wekiwit.pdfIn PDF document text
    • http://xn--j1aai7d.xn--p1ai/userfiles/file/pepekigatizimatapogepajo.pdfIn PDF document text
    • http://stuarteisbrucklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/23510852670.pdfIn PDF document text
    • http://guyfamilyreunion.com/clients/41950/File/domakogeraditojik.pdfIn PDF document text
    • http://betaempire.com/uploads/userfiles/file/file/bexagepevedimaxobebofemur.pdfIn PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/cac801e6defe0478889e16cfc49f9c5c/jaxoduruf.pdfIn PDF document text
    • http://okfilm.kr/userData/board/file/34501910104.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16104795d106f2---nejawerot.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610419e0d34cd---69955350623.pdfIn PDF document text
    • https://soportedevida.mx/ckfinder/userfiles/files/67179779491.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d31b0e5acd4---pefemirosukidide.pdfIn PDF document text
    • http://cana.vn/uploads/userfiles/file/29817266773.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=ramayanam+malayalam+pdf+with+meaningPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB1B 16480 bytes
SHA-256: 6155da951db358c0842c4b4c496bd760966d1368cfd4d56ae696cdf144e7c9a6
font_01_sfnt_off0000e1e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E7 27872 bytes
SHA-256: 917bffa0bf4bddd197f59211cabaffb406186e3177f2e891bf89dde02e00bdec
font_02_sfnt_off000125f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125F8 1868 bytes
SHA-256: 9d2bb2d94384256bb38bab4c3005c13f44a8b25eb5b232dcefe64ad24aae4b51
font_03_sfnt_off00012eb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EB0 10800 bytes
SHA-256: 426e408481bd3b6d9cab855e36abe9a6568bc8cf43f0ab5c14366dba6a1efbbd
font_04_sfnt_off00014735.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14735 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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