Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bfc2ba65022131b…

MALICIOUS

PDF

81.1 KB Created: 2021-09-05 04:23:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 412f7ec4f2162fff48911445632603dd SHA-1: 73e5b7ffe729932d84430188183c6e100b0c19e8 SHA-256: 6bfc2ba65022131b13d919dc68bf17a7d83cf514aa12124db7fb575eaebba257
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier with high confidence. It contains numerous embedded URLs, many of which point to compromised WordPress uploads or disposable hosting, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated and unreadable, preventing further analysis of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16099b70215bb7---bibaz.pdf In PDF document text
    • https://dakhoathienhoa.net/images/files/30402394094.pdfIn PDF document text
    • http://ahchala.com/img/file/18190414143.pdfIn PDF document text
    • http://cerritos.songhakbbq.com/uploads/files/49536294818.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/f3de6b9925e3c15639255e3d8ef61632/rafokonagarivajoliza.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608d312f607a3---46724863587.pdfIn PDF document text
    • https://viboot.traigiongthuha.com/ckfinder/userfiles/files/56602053258.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a46ff21475b---50236704677.pdfIn PDF document text
    • https://transit-connection.com/userfiles/files/pitaw.pdfIn PDF document text
    • http://vogiantinhmach.com/media/ftp/file/24659633635.pdfIn PDF document text
    • http://yokohama-model.com/userfiles/files/goriripofemapu.pdfIn PDF document text
    • http://kjphotocon.org/data/userfiles/files/22520747368.pdfIn PDF document text
    • http://bephoangdung.vn/uploads/ckfinder/files/keparesix.pdfIn PDF document text
    • http://ser-buk.com/userfiles/file/44587312825.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/ac952208b8cd23d00a8bc5c477f60ec1/zerufal.pdfIn PDF document text
    • https://careersourceokaloosawalton.com/files/public/samutuzi.pdfIn PDF document text
    • https://acrgruppe.de/userfiles/file/mezulojabipulexu.pdfIn PDF document text
    • http://xn--l3cbpp3gh4a5g5c.com/userfiles/files/gapibuzo.pdfIn PDF document text
    • http://food-cloud.com/home/food-cloud/www/site//site/data/files/58638287806.pdfIn PDF document text
    • http://kap-group.com/ckfinder/userfiles/files/purodalov.pdfIn PDF document text
    • https://shen-su.eu/gfx/userfiles/files/besavezibidenofumojorunu.pdfIn PDF document text
    • http://stitesattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xunogajavofibofuzo.pdfIn PDF document text
    • https://webupdate.ca/wp-content/plugins/super-forms/uploads/php/files/0o6tv9l2n3pki92dg2hduedquc/72302603569.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad195a5548---gewegojepiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=orthopedic+book+for+mbbs+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_off0000dabd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDABD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2CF 16820 bytes
SHA-256: 4de229b146469e149123d9a622b71c0d85a6c66b1b3786cf9f12bf5d0e974b99
font_02_sfnt_off00011e28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E28 10828 bytes
SHA-256: 49d48d0a099f73eda020f048d0f6232015a0ed9c904d52db7cb1542ecfd01ccd

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