Malicious PDF — malware analysis report

Static analysis result for SHA-256 440e37b949165607…

MALICIOUS

PDF

119.2 KB Created: 2021-08-25 07:56:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 516df1027e81ef3e995e5d4a9e7b1211 SHA-1: 006bd2ef3aa8b9c56d26075e5f27a5605ab4a215 SHA-256: 440e37b94916560718a1cdbdec3ea353fbd93a94232ffd6d420a6f1e0c00a681
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that form a link farm, a common technique for phishing or distributing malware. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded links suggest it's designed to lure users to external sites, likely for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9889

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://oniceh.ru/uplcv?utm_term=erikson%27s+eight+psychosocial+stages+of+development PDF link annotation
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608640a6219d0---69589682197.pdfIn PDF document text
    • https://fizjolech.pl/userfiles/file/54666332962.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/el0upcouktvq7i0frhok2oaf58/78206316738.pdfIn PDF document text
    • https://akita-inu.lv/www/files/files/nuwawelugavolokokom.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/16074a17ccf447---94629369714.pdfIn PDF document text
    • https://sailstudy.in/ckfinder/userfiles/files/79697372541.pdfIn PDF document text
    • http://christopherdallo.com/file/19594582999.pdfIn PDF document text
    • http://altiro.nl/home/tjerk/file/27754490676.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/1636813799.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/71192010908.pdfIn PDF document text
    • http://monikaknoblochova.com/userfiles/file/46958086432.pdfIn PDF document text
    • https://fullmagicweekend.com/ckfinder/userfiles/files/75804174333.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610c895e030a6---vosokogavufuwidun.pdfIn PDF document text
    • https://nestaerospace.com/uploads/file/18319673985.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/71944768801.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607df6f6dbab4---31811943434.pdfIn PDF document text
    • https://tkquiz.com/userfiles/file/54828641503.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/58687153192.pdfIn PDF document text
    • http://psychoterapia-przemysl.net/img/userfiles/file/vupitobevapexizegame.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc9534bac2---32113797737.pdfIn PDF document text
    • http://wingmanresearch.com/userfiles/files/31962089003.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/al05fhmath9p7i3fg55hcpuqp1/99713006423.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_off00016b56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B56 17940 bytes
SHA-256: 6ff688ba2701cb2b2693ba816a86532910b1075fa2eb838bf1df08f3625e2f42
font_01_sfnt_off00019a9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19A9D 11356 bytes
SHA-256: ffc27466ec8dd8223c5cb180ffc0577ac2b3d8bef33b7c3a3c696f4045497ab9
font_02_sfnt_off0001b508.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B508 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1