Malicious PDF — malware analysis report

Static analysis result for SHA-256 f903360817ace2d8…

MALICIOUS

PDF

76.9 KB Created: 2021-09-08 02:32:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ae34246448f45ad4daf0b70e9a04b9f9 SHA-1: 227c3246853409236dd3a8c8551399e3eabbb13c SHA-256: f903360817ace2d8faf37d4241fa127f42ce361e4fc7f71e12e0b89a68477147
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, indicating it's designed to host malicious content. Heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on potentially compromised or disposable domains. The presence of numerous unknown URLs suggests an attempt to distribute phishing content or further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://bagliodeimille.it/userfiles/files/65273217093.pdf
    • https://magatek.com/documents/file/29798153734.pdf
    • https://systematix.pl/userfiles/file/97686297567.pdf
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d840cb804e9---40439246144.pdf
    • http://pasted-radio.de/web/files/11000076401.pdf
    • https://tyko.pl/userfiles/file/sivalef.pdf
    • https://cr2tek.com/userfiles/Proj_Name/files/fuvopafatodev.pdf
    • http://szentimresiklos.hu/upload/file/vugijidovitovovixuk.pdf
    • http://gldbirdgel.com/user_img/files/vusazaremenusozar.pdf
    • http://portamarioarchitetto.eu/userfiles/files/vimeratupamiligus.pdf
    • http://webelievedin1984.com/clients/6/67/676624d6593aa512bfa6e10e765af00e/File/22733453590.pdf
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/0io8i1is1c7m9h4qvg627nqlgi/fozumikeji.pdf
    • http://avandcie-automation.com/ckfinder/userfiles/files/kafewerekuvarofajipena.pdf
    • http://a-daily.jp/app/webroot/contents_img/files/ziritajadujixezakobebufi.pdf
    • https://watertorens.nl/userfiles/file/rudubavusoxu.pdf
    • http://jinruily.com/UploadFile/file/20210723103715945.pdf
    • https://grandplaza.bg/uploads/assets/file/zexaworowoz.pdf
    • https://picinterior.com/ckfinder/userfiles/files/kutelogifitewususiwu.pdf
    • http://universalthailand.com/images/uploads/ckfinder/files/35877855275.pdf
    • https://hamzsabegi60szallo.hu/UserFiles/File/15595927700.pdf
    • http://accessprecision.com/userfiles/file/90043973212.pdf
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160836206e234d---xatuzikusorapugupum.pdf
    • http://kleinschadenexpert.com/userfiles/file/jilanazaj.pdf
    • http://fence-alarm.com/userfiles/files/94330442041.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=disinfectant+and+antiseptics+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_off0000cb1b.bin
c9ba32c6c34d79d9cd37bf8b4d2dfb7f82494046e4937a33bcaa1c0b901bb0c3
pdf-font-stream PDF embedded font (sfnt) at offset 0xCB1B 16752 bytes
font_01_sfnt_off0000f67b.bin
8ba20d0b40e0c2d28d8aa5aa3e5d087d6fb8d97bb201e6cd3c427cd55f386c21
pdf-font-stream PDF embedded font (sfnt) at offset 0xF67B 10348 bytes
font_02_sfnt_off00010dfd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10DFD 16792 bytes