Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b5cb2da0ebf5d98…

MALICIOUS

PDF

72.7 KB Created: 2021-09-01 15:35:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c81dd4a2c9fe48b1195499644790faea SHA-1: abe5efd327a9383335ba10638cba750b565c9536 SHA-256: 3b5cb2da0ebf5d9898815d716520861835c4bd29e04a8440058c19bb4be06b44
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that point to compromised websites and other PDF files, likely intended to lure users into downloading further malicious content or submitting sensitive information. The presence of multiple external URIs and links to compromised CMS uploads strongly suggests a phishing or distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://irlanc.ru/uplcv?utm_term=how+to+merge+2+jpg+into+1+pdf PDF link annotation
    • http://andrenickels.de/ckfinder/userfiles/files/xagefutudalawumabosomaze.pdfIn PDF document text
    • http://ashioke.com/images/library/File/miwejidunisutowizoxigakig.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1c165f6cd---tewetej.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e570e0680---93265908109.pdfIn PDF document text
    • http://atomleasing.ru/media/File/nirabodamurufibobizujorol.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/1459806674.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/56033053036.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608d4cf3ad605---79850755652.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa405728783---83054395198.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b25e274dd21---77396601813.pdfIn PDF document text
    • http://chatfieldfarms101.com/userimages/lomelolilojasiviwefarigo.pdfIn PDF document text
    • http://conblocmanado.com/pics/file/nexijekulalepode.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/23ec3a3bd6e0b22dc93799d00e1e5e50/dugob.pdfIn PDF document text
    • http://fijiembajak.com/uploads/ck_uploads/files/79689244441.pdfIn PDF document text
    • http://baudoinfamily.com/clients/f/fc/fc66627f90e8a365851b026dcf169025/File/96994963782.pdfIn PDF document text
    • http://funperm.ru/content/file/malojavur.pdfIn PDF document text
    • https://dovolena-jiznicechy.cz/uploads/14878443272.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/34d7d3ff26aac94de992cfa87025cb5a/32719506485.pdfIn PDF document text
    • http://english-life.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607184fa30d48---monukapapov.pdfIn PDF document text
    • https://marbeyoyun.com/calisma2/files/uploads/64039675968.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ace6c2bdc7b---98324201924.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160705ecaba547---27568959718.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_off0000bbce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBCE 10844 bytes
SHA-256: d478f04fb958653130d9e4bb7db4bfc61b70df981fb3e8d6f171768227ffa437
font_01_sfnt_off0000d4a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ecbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECBB 15752 bytes
SHA-256: aef5b5e172b7ee83d95c2f40e05d92046deaf7844083c1c1c8d6cf1f104e155e

Open this report in the interactive analyzer, or submit your own file for analysis.