Malicious PDF — malware analysis report

Static analysis result for SHA-256 b89b0eb0d882f4fa…

MALICIOUS

PDF

82.8 KB Created: 2021-09-03 10:21:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3691749d13d0a4dd0cc7fb39e8bb6935 SHA-1: 415e994b73e26298cbc3276755c5a4c8bc70576f SHA-256: b89b0eb0d882f4faa09cfb90a0f9c54dc6248fdf88018d297702bb52a94d6354
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to external sites, some hosted on compromised CMS uploads. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests these links are designed to manipulate search engine results or lead users to malicious content. No scripts were extracted, but the overall structure points to a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://nomylo.ru/uplcv?utm_term=download+christian+religious+studies+pdf PDF link annotation
    • http://wordtmann.beckbauer.eu/ckfinder/userfiles/files/48475144859.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090c8e70f396---gimaroguzemu.pdfIn PDF document text
    • https://summit-christian-academy.net/scauserfiles/files/11875077390.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/gijalovoripanarix.pdfIn PDF document text
    • https://xn--49st2et51duvk.com/upload/files/tobogigitebuwibipudomi.pdfIn PDF document text
    • http://rs-entp.com/upload/file/69719007936.pdfIn PDF document text
    • https://educationindiajournal.org/ckfinder/userfiles/files/nunorevibovugokepan.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/59149798791.pdfIn PDF document text
    • http://infunplastic.com/d/files/52953927331.pdfIn PDF document text
    • https://chris-arnold.com/userfiles/file/91316022290.pdfIn PDF document text
    • http://keralajesuits.org/userfiles/file/41332127833.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/82h6av586brblda4f77vps67f7/73321974089.pdfIn PDF document text
    • https://koratspring.com/upload/file/79112639459.pdfIn PDF document text
    • http://bsp-plovdiv.org/ckfinder/userfiles/files/masimopunosixetabedadikut.pdfIn PDF document text
    • http://artgraf24.pl/userfiles/file/76466992020.pdfIn PDF document text
    • http://kme-kme.cz/files/file/zifijewitudufofinirix.pdfIn PDF document text
    • http://byty-pardubice.eu/UserFiles/File/luderiwigobabudakugev.pdfIn PDF document text
    • https://spitalmoldovanoua.ro/ckfinder/userfiles/files/gazalizuvodaxodusu.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/e5ebbf157d6e0cedec123e7c9586640c/11003192518.pdfIn PDF document text
    • http://hzaidele.com/images/upload/File/pafomajusawewonatinumew.pdfIn PDF document text
    • http://enovosti.info/ckfinder/userfiles/files/85139244413.pdfIn PDF document text
    • http://bsl-trans.ru/admin/ckfinder/userfiles/files/wozowok.pdfIn PDF document text
    • http://hkacca.com/userfiles/23117969354.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_off0000dfc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC8 16988 bytes
SHA-256: 44b406c5802c30c8345fb1d928f7f8f52d5af2f478af7a731c63bd12898c5c49
font_01_sfnt_off00010b70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B70 11088 bytes
SHA-256: e2f09a07758aba349cb10a62349513d39289a988b55bd52823e1df9b2507cd6d
font_02_sfnt_off00012515.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12515 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1