Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbb6136cad139a6e…

MALICIOUS

PDF

76.9 KB Created: 2021-09-02 01:51:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 70f6d4822de428275c4a59aa5c34c6e8 SHA-1: e20e6813f41cdd9907346bf604b1366f1ad2c06b SHA-256: bbb6136cad139a6e19ce0f65a4d9d450f59ea2eb1d6508a89a9dd0553a879642
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicate a deliberate attempt to create a link farm for SEO manipulation or to host malicious content. The embedded JavaScript likely facilitates the redirection or download of further malicious content, contributing to a phishing or malware distribution attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pistant.ru/uplcv?utm_term=chess+pieces+rules+of+movement PDF link annotation
    • https://syntellect.ru/Repository/file/punutotulakavepusifude.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/zuvezitor.pdfIn PDF document text
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/lanozuwan.pdfIn PDF document text
    • http://poltinka.ru/userfiles/file/dafonezevorovevepapozadaz.pdfIn PDF document text
    • http://fritz-fahrlaender.ch/download/lomoberepirul.pdfIn PDF document text
    • https://drivetripper.com/userfiles2020/files/zamadalimo.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/8be2c646b961b9f545cab3f1da077537/22314632551.pdfIn PDF document text
    • http://internationalnetworksolutions.net/files/In PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160807e27975d9---fizosejawebegetodipawoza.pdfIn PDF document text
    • http://stinpo.com/ckfinder/userfiles/files/xenedena.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/370cac920ee5d12b81e8af17860a1ee6/68577920873.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/eoa9diev5mlflkvqgu33f06rs2/lilabetema.pdfIn PDF document text
    • https://www.bmo-agencement.fr/ckfinder/userfiles/files/rajelajilupokefilunogok.pdfIn PDF document text
    • http://elyriacatholic1970.com/clients/7/79/79c6984f8945646ae1b55d50a6b4dbab/File/45476421331.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/93280233705.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160821a14de0a8---72406533267.pdfIn PDF document text
    • https://vidaleve.net/ckfinder/userfiles/files/batuvavif.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/c8cc8e2bfbb23f38b5d22352295d81d6/39024609390.pdfIn PDF document text
    • https://tndvn.com/js/ckfinder/userfiles/files/3610278601.pdfIn PDF document text
    • http://omg.su/upload/File/39875498890.pdfIn PDF document text
    • http://jdjcnc.com/upfolder/e/files/20210704100056.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1612c57621eab8---dajudesizojizegisisazoket.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16078c9f72eae7---zobage.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/4d4rpt0d84bilvl3uh6nqnl0e7/puvobola.pdfIn PDF document text
    • 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_off0000cac6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e2d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D8 16428 bytes
SHA-256: 1e5561b4d733233778723a4b2f2e834f81f8021273bd97e2f63054c27e6d0825
font_02_sfnt_off00010d21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D21 10780 bytes
SHA-256: 8eb4bf5e3d17e94161810bcd8eb1c6c63df94a4b3dc4cf47d4dc90275f5d0fcb

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