Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2e9535b2fea3282…

MALICIOUS

PDF

78.7 KB Created: 2021-09-05 06:02:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 96b49abbe0c9a77b85227f96718ba8c2 SHA-1: ebf779749eadd87f9cb11cfa925f70a5760a5c2f SHA-256: e2e9535b2fea328253a462544da4589b754c906feffbb49a0a4053a48bb19f31
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous external URIs and link farms pointing to potentially compromised websites, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the nature of the heuristics indicate that the document likely serves as a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://pixomot.ru/uplcv?utm_term=ielts+writing+task+1+academic+examples+pdf
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b6f36fcec4c---83628659257.pdf
    • https://apsco.ly/userfiles/files/logejojar.pdf
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/oro1p2ci35n4rp2qosk2btrl9n/8603602348.pdf
    • https://cbconsulting112.ca/userfiles/files/72038410202.pdf
    • http://zamel2.pl/userfiles/file/29967635449.pdf
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1487c1fced97e1dd17fe966997692af6/96164557316.pdf
    • https://alienaquatics.com/home/gb/public_html/ckfinder/userfiles/files/tesepiluvafutejinik.pdf
    • http://uss100.com/clients/5/56/562308f4da1da23328cfd9e5c9f3e68f/File/51359936019.pdf
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3e30d024b9---28977132460.pdf
    • https://www.letspassdriving.co.uk/wp-content/plugins/super-forms/uploads/php/files/kiq89idl86e8g9nb6q8fioher0/budetibunesotiviwub.pdf
    • http://penzionklara.cz/userfiles/file/giduropuw.pdf
    • http://ausafe.net/images/art/files/xikupiweturomogo.pdf
    • http://clair-environnement.eu/catalogue_dynamique/file/24008137866.pdf
    • http://mamtomchabahai.com/uploads/files/files/12027951568.pdf
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098a60d9d7ac---66590278006.pdf
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/cbkh9hmuiif91pjsds1bqe312i/pokopaf.pdf
    • http://aire-limpio.com/img/editor/file/dimesarajudinunun.pdf
    • https://mfdesign.hu/files/file/71328014738.pdf
    • https://clubslotalmatriche.com/calcas/file/69362625485.pdf
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/db709a9deec5a3ed91f10d1288632ac0/nawulogimawetusijixe.pdf
    • https://asiajitutop.com/contents//files/6089826519.pdf
    • https://istanajp2.com/contents//files/31400319612.pdf
    • http://arniestribu.com/campannas/file/93392388763.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_off0000cf59.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCF59 16792 bytes
font_01_sfnt_off0000e76b.bin
153a7eb40c06b105b68b95d9e8a3a12396a5fcccf71aaee8a26c713af6f340f5
pdf-font-stream PDF embedded font (sfnt) at offset 0xE76B 16892 bytes
font_02_sfnt_off000112ed.bin
7f5877e4a13422d9d14f8410c255e8aab775b0742af7101af32e85ea26c74d4a
pdf-font-stream PDF embedded font (sfnt) at offset 0x112ED 11124 bytes