Malicious PDF — malware analysis report

Static analysis result for SHA-256 55b78138caa278da…

MALICIOUS

PDF

97.6 KB Created: 2021-09-16 15:44:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 91ad081d91ff4ee1fba97d7e88a9ec88 SHA-1: f9808120d246cd61f1f1f42f8779711d21ad07b4 SHA-256: 55b78138caa278dac6476ab699a7a573c8a2bd21966e7b4c26440ef80294ef4c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of links pointing to various websites, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent. The embedded URLs and link farm structure are indicative of a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://catamma.ru/uplcv?utm_term=chal+mera+putt+2+movie+online+free PDF link annotation
    • http://educasters.co/ckfinder/userfiles/files/tukateruwezinupipikeze.pdfIn PDF document text
    • http://apartament-krokus.pl/userfiles/file/14554162712.pdfIn PDF document text
    • http://mintaialuminum.com/d/files/52214678220.pdfIn PDF document text
    • http://ratchee.com/ckfinder/userfiles/files/91334980711.pdfIn PDF document text
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/33715608945.pdfIn PDF document text
    • https://eownauto.com/uploadpic/files/dajejigotizonebulutabekok.pdfIn PDF document text
    • http://manuale.aziendasulweb.it/userfiles/files/xeruvidirijivupugivonin.pdfIn PDF document text
    • https://infiniteprospects.com/FCKeditor/file/fadagalovaj.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16136e22733841---xevututulewufoxuvedu.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16131d3454e55c---83966692414.pdfIn PDF document text
    • https://wanna-drive.nl/files/File/xafuxalefitoboxizufigon.pdfIn PDF document text
    • https://southernwashpros.com/nbloom/fckuploads/file/24946575423.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1612fa794d30d7---89637401854.pdfIn PDF document text
    • https://soudurelauziere.ca/upload/editor/file/dovusezifoxosovad.pdfIn PDF document text
    • https://silverbirdmarketing.com/pages/images/file/peloxemosilavevux.pdfIn PDF document text
    • https://autopits-directo.migrupoq.com/ckfinder/userfiles/files/pemuposidaxanibojosegixo.pdfIn PDF document text
    • https://people11people.com/uploads/File/godaturemamixubivevi.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/nm3hf6e5p9vmiqmafdqd87b356/41564381301.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/34153236428.pdfIn PDF document text
    • http://goksirlambinowice.pl/img/upload/files/surabi.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142db7a0177e---45024882555.pdfIn PDF document text
    • http://cgl.lu/userfiles/files/61067783959.pdfIn PDF document text
    • https://monamifrance.com/FileData/ckfinder/files/20210904_6F43911B526BD281.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_off0001107f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1107F 10772 bytes
SHA-256: e99b5b3a3fd29aa5f86766f7b1b84358f1792633c7458d26299157725fef3102
font_01_sfnt_off00012925.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12925 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014137.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14137 20924 bytes
SHA-256: 03cd1839cda0a7d57659186bd7a06ccc2f17ca40452103139b7a8443b9bb32fb