Malicious PDF — malware analysis report

Static analysis result for SHA-256 f88125e601995dae…

MALICIOUS

PDF

92.2 KB Created: 2021-07-16 06:55:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: dd8b446f0bf02eb6c29d73493d847ebd SHA-1: c04cf196d0b53250efcf20b28fc9a2a5bebaaf15 SHA-256: f88125e601995daeecb225a3ac4aa98066feb8ec8bb516a1479c57c26679c0d4
196 Risk Score

Malware Insights

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

This PDF document is flagged as malicious by ML classifiers and ClamAV, exhibiting characteristics of a remote-support tool lure. The document likely aims to trick the user into downloading and executing a payload by instructing them to install or connect with a remote support tool. The presence of numerous external URLs, many pointing to compromised CMS upload storage or disposable hosting, further supports a malicious intent, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://medvor.ru/uplcv?utm_term=target+audience+persona+example PDF link annotation
    • http://pamat.ro/UserFiles/file/nupanex.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/ralejepa.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d199f2a6a9e---tofel.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/f6c3d8da5d0f07a7c878f542487eb10e/bifakaxode.pdfIn PDF document text
    • http://weclassof86.com/clients/6/6d/6dc59c75684a9be5e3a4726337e2fa3a/File/83556295293.pdfIn PDF document text
    • https://e-tta.com/app/webroot/userfiles/files/zevasi.pdfIn PDF document text
    • http://tmtechvn.com/webroot/img/files/27828047910.pdfIn PDF document text
    • http://serting.eu/userfiles/files/72401570307.pdfIn PDF document text
    • http://btc-ltd.com/upload/file/dateruram.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/bfbbed37de1d2fce9147464170ceee6c/xaxufitaxamofulenonazew.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5979f3c2a---58928061393.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/6866930b1acccb69671a63dae4cd02e0/88910922616.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9e20549c5---rijuvugifuxajulumepesade.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/1a0102543bc654b07dddb71bf9266ae3/2582007040.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160b0a0554b4f8---selilakijiwoni.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/8576782552.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b61ab33e701---52648058881.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160986b7328026---setazokazodaxawowaxipo.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607905ddce2b2---dasomiropipepotu.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3322e6755---4634143409.pdfIn PDF document text
    • https://www.nexidia.it/wp-content/plugins/super-forms/uploads/php/files/ebc7613ed3f20d7802e5061c20c97c08/terujezatom.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160dac7929ee85---86412894271.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/rm2afr0n3e3t4aaefi9a7tr0h4/50026379982.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/vikibovanivefekilox.pdfIn PDF document text
    • http://eurogeographyjournal.eu/admin/fckfiles/file/49221805141.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_off000103b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011bcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BCF 11020 bytes
SHA-256: 4e3025566bcd1d58aecb93327d1e49e6067fa94cb573c28dc5e22e759bcb98fb
font_02_sfnt_off00013537.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13537 17664 bytes
SHA-256: 946fa42bc751f7607e6df314001c6207a1cb3632f77a7cfd578b021f0c0c9551

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