Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb484fff6bc55246…

MALICIOUS

PDF

75.2 KB Created: 2021-09-24 10:02:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e3ce460d098cd392a0fa35679ab88af5 SHA-1: 54aabb92f8c5bc0415931ee039c806cd458ba224 SHA-256: eb484fff6bc55246fdbc95e5fcd9f2b300ac6844913e4252308fb9a879a7d361
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users. The presence of external URIs and link farms points towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://smidgel.ru/uplcv?utm_term=developer+options+android+10
    • https://lbk-ingatlan.hu/uploads/file/gevipurofuxano.pdf
    • http://ssaisarang.com/ckfinder/userfiles/files/vizokux.pdf
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/a58e0f6b7dc43cb9b4860df6827dfefa/kazapurugamuwuwagerelima.pdf
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136a85825f8a---8701436268.pdf
    • http://mentor-tutor.com/newGroserLikeProject/uploads/files/kapemese.pdf
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/161495b2a26130---73053820377.pdf
    • http://codienlanhtrangia.com/Images_upload/files/kefitesefavu.pdf
    • http://yuanhebiotech.com/upload/files/tofijelaxu.pdf
    • http://chanhbon.vn/media/ftp/file/vefosorofabanudodutejo.pdf
    • http://parcroyale.hk/userfiles/47074399206.pdf
    • http://lamekatus.ee/uploads/ckeditor/files/74036261762.pdf
    • http://beautybybelief.com/admin/images/file/96619510587.pdf
    • http://kortennis.co.kr/B/ck/ckfinder/userfiles/files/jojodiduvalogetenuxewagaf.pdf
    • http://ambcavallon.eu/userfiles/files/xufunabejibakivesison.pdf
    • https://condominiovillage.com/userfiles/file/89628079172.pdf
    • http://maslatalaia.com/userfiles/file/58694560338.pdf
    • http://abhinavabhishad.org/userfiles/file/29265897421.pdf
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/mb2je00lost31mt12kst0qgs27/13688390955.pdf
    • http://vipforiraq.com/userfiles/files/65887894967.pdf
    • https://panelshock.com/userfiles/file/rajamibilugupelemeguzivew.pdf
    • http://chanhbon.vn/media/ftp/file/58135898590.pdf
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1614b5e4324cb1---xiwumudenuxesozeveleniv.pdf
    • https://dolupin.com/calisma2/files/uploads/88862806747.pdf
    • http://www.web-globus.de/ckfinder/userfiles/files/wenuvozelejokiminagub.pdf
    • http://4bzsoftware.com/Images_upload/files/86690006194.pdf
    • http://elezioni2014.gds.it/userfiles/file/gegonuxibo.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_off0000c43b.bin
9d02d0e9dba44baa0187813cb95440808260569c244b8afb28b34408eefe48df
pdf-font-stream PDF embedded font (sfnt) at offset 0xC43B 16476 bytes
font_01_sfnt_off0000eeb8.bin
f1a1403ac6ed524ab86f4a0ce3e6a1cb5ea5f5bc0c33748ff7b11b0d1ae852f7
pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB8 10624 bytes
font_02_sfnt_off00010725.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10725 16792 bytes