Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b290c9696501338…

MALICIOUS

PDF

78.0 KB Created: 2021-09-06 17:51:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 69d33ec5eb82e5317be221f083983968 SHA-1: e13cb918c828866ea17647b99c4b2a5638dad15e SHA-256: 1b290c96965013386d34e55df9936bf736b943d847a4db49f641e0fc1a4b4c02
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are typical of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://crysiq.ru/uplcv?utm_term=number+11+worksheets+soft+school
    • http://maytinhtuyenquang.com/home/maytinhtuy/domains/maytinhtuyenquang.com/public_html/images/file/tokipun.pdf
    • http://soupworld.de/upload/file/wewaxol.pdf
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4f1ffedc74---45400628198.pdf
    • http://szentistvanpatika.hu/upload/file/pomiriz.pdf
    • http://breakevenpoint.pl/uploads/editor/file/80031522370.pdf
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/zobixefopubupoziko.pdf
    • http://yer-krasnodar.ru/ckfinder/userfiles/files/96353354984.pdf
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/b7f84f7b4531698833d70df0bb73c1d6/13904893485.pdf
    • http://byecook.com/ckupload/files/sikag.pdf
    • http://cwesp.biz/upload/file/zozexagapuvajovo.pdf
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/ov63b9v9bmk4ptnhc7bnr4brbs/gubebotofukopolapebedok.pdf
    • http://ankurgroups.com/userfiles/file/fovawep.pdf
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/jewiwekisuzikoja.pdf
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/gimqomb2bp9d2fttcgk8t8fq4v/47861151558.pdf
    • http://circuitvietnamcambodge.com/hinhanh/file/gagijatebakisekatowiru.pdf
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16112211bcfb44---xawogixefinurarijejugi.pdf
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161123ccdbfa92---97448099646.pdf
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/or8ttho9ipshrcmblu2arbo68t/xemigafup.pdf
    • http://dges.in/userfiles/file/jenenidunax.pdf
    • http://rittenhousereunion.com/clients/a/ad/ad7d26974070b67854a29702aed78614/File/52865852369.pdf
    • https://accuratesearch.com/userfiles/file/vobud.pdf
    • https://maisonforville.be/documents/file/79183390800.pdf
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086aebdecf7a---nirepunibedikotosab.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca6f.bin
9975a065ef6dee38fb07c6018097bbff7db7e3918882a155fea0869e94a94f16
pdf-font-stream PDF embedded font (sfnt) at offset 0xCA6F 18232 bytes
font_01_sfnt_off0000f9f5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F5 16792 bytes
font_02_sfnt_off0001120c.bin
82ca19287c0dc82cd65ac5eb14d687daf7889df22aafcb74ccbf66e3eee51b5e
pdf-font-stream PDF embedded font (sfnt) at offset 0x1120C 10692 bytes