Malicious PDF — malware analysis report

Static analysis result for SHA-256 506cf8d5dda3f3ec…

MALICIOUS

PDF

86.1 KB Created: 2021-07-19 01:42:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 9490d2a424e1c8c59ddbc940c444c41d SHA-1: 02a98e65b9bfe9c30a548911e04d6d9433ea088a SHA-256: 506cf8d5dda3f3ecbf79a0a4941e79910c82f3685149292ded7f2362d5aef2f0
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised WordPress upload directories and disposable hosting. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of many external links suggests an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16085bbde95b88---biseduwonenapiroros.pdf In PDF document text
    • https://marcuspietrek.de/MARCUS/files/file/27405683177.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607904a372a12---gifanazoxipukija.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/ascqkerirfdjn0jcqji7pg40mn/kepivoxaru.pdfIn PDF document text
    • http://imaginove.eu/data/Files/nisarivabebolixokijamowep.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/gixaliwo.pdfIn PDF document text
    • http://lukinserv.hu/file/5881230011.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160860497337f7---10257308508.pdfIn PDF document text
    • http://nguyenquangcomputer.com/upload/ck/files/34345367394.pdfIn PDF document text
    • http://ypperfect.com/ckfinder/userfiles/files/rejorafobofim.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/db2218136168cbfc6eeda8e0d3210235/82178979613.pdfIn PDF document text
    • http://barnesfamilyconnection.com/clients/f/f3/f37d50667a1bb99e511e26172889fab9/File/luwilufukedepusigewi.pdfIn PDF document text
    • https://bepxuyenviet.com/upload/files/85571319141.pdfIn PDF document text
    • http://www.amedna.com/userfiles/files/tobiku.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b89dd939c51---78380657730.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/445fd32d6e89d243c19da508b5bacb13/zozewopobosisuwug.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/urkl4iu86ipum60943f0pj6126/29963714989.pdfIn PDF document text
    • https://datatech-int.com/userfiles/file/88267926909.pdfIn PDF document text
    • http://tantusmarina.com/UserFiles/file/11488896543.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0fce6deb6---6312788256.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b108f9095d6---52830805356.pdfIn PDF document text
    • http://caphegiabao.com/upload/fck/file/xusazexuvedo.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16080eacb32c12---wogoxo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=circumference+of+conePDF 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_off0000ec03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010415.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10415 18208 bytes
SHA-256: 18da8ad18c0b172973d49d288c3ead930de754b9a9a3f7f200594f823bf3dddc
font_02_sfnt_off000134a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134A7 10156 bytes
SHA-256: b4454c9ae7f4e83848bf768ac97e4d5d275e771613d093ecd4e2121471eef422

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