Malicious PDF — malware analysis report

Static analysis result for SHA-256 d49cf81e821bdfda…

MALICIOUS

PDF

97.6 KB Created: 2021-07-13 22:42:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9bf2328b1566c49df60c9679bf332fc2 SHA-1: 2341a90d9c2cd3fd102e5f647377b79fbaa9a493 SHA-256: d49cf81e821bdfdaa9b2c3ce19207e59cc27bd738feefba8fa56f2ff6ea4a538
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many hosted on compromised WordPress sites, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated and unreadable, but the presence of numerous external URIs and the heuristic firings point to a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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 https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/475622afd97f709bb4e520dc7f964b2e/89294674869.pdf In PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/d98c30e3a1fefee1ab525bd9768f31d1/faruxamotigefebanazikefe.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/fe2dc48d876a79315cbd1b842ee65e16/bokabinisofotugiwesemeki.pdfIn PDF document text
    • http://lightningriskassessment.com/ci/userfiles/files/gilap.pdfIn PDF document text
    • http://osmed.cz/app/webroot/files/files/pajezixiwow.pdfIn PDF document text
    • https://ip-kamera-rendszer.hu/ckfinder/userfiles/files/vazip.pdfIn PDF document text
    • http://candemdientu.com/Images_upload/files/96503374483.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/95167403704.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/395bdd2794440824ab5b917743d12325/65478905066.pdfIn PDF document text
    • https://congthuonghotel.vn/app/webroot/files/images/pages/files/88533376464.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160b063dac161b---zenawisevubo.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b31970d1f24---tewimafovanamidezumiv.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/23568688770.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078580e3255c---bosovuxasutuje.pdfIn PDF document text
    • http://itkaufmann.com/images/fckimages/file/79776101873.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e1238d5e16---taxudixomanetaxepovibubo.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/s9f24h6c9iqflqotedn4ufu58k/63777511349.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/585837f706f562d83aa32a48dd73b589/notetigukejav.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2613436ff---gajiwatowedevu.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/zizaxamokufivozutuxiti.pdfIn PDF document text
    • https://naoshima-habitant.com/31935008797.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/zemuliwixalobutuxave.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=11+minute+timer+with+musicPDF 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_off00011dce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DCE 17104 bytes
SHA-256: a8a45d76dbc3f22e72bf186d52493d889e3f8265ebb6d2945e1861d2f9f17c51
font_01_sfnt_off00014a30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016247.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16247 10308 bytes
SHA-256: 064ad8298002340e52b4834f6a5de770a5710f7073f1e53a835e3d1b421a65b8

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