Malicious PDF — malware analysis report

Static analysis result for SHA-256 6df92ef619fba73e…

MALICIOUS

PDF

83.3 KB Created: 2021-09-18 09:53:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 07debfb16138293bf427e45e53e03db1 SHA-1: b3217b7125f517c9cbf14d98f5a8807c6bc95a31 SHA-256: 6df92ef619fba73e2d28af94ecb912d89982d3ccac79374cecb17bc0fe5d750e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URI heuristics and the 'PDF_SEO_DISPOSABLE_LINK_FARM' rule further support this, indicating an attempt to use the document for SEO poisoning or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://synerhu.ru/uplcv?utm_term=android+find+my+tablet PDF link annotation
    • https://www.esicm-old.org/admin/lib/ckfinder/userfiles/files/68117562864.pdfIn PDF document text
    • https://opsclown.it/ckfinder/userfiles/files/557701012.pdfIn PDF document text
    • http://gd-weimi.com/upfolder/e/files/20210904115924.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614063a0adbe4---18100617625.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161366bbaa9f03---megedalusazobewiwana.pdfIn PDF document text
    • https://nileagriculturalindustries.com/file/nemawotarojabufuj.pdfIn PDF document text
    • http://bielle-srl.com/userfiles/files/jafezijabusobuzavepapaf.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/161458b99831b3---81826610537.pdfIn PDF document text
    • http://celesteandtorsten.wedding/images/file/turorulepe.pdfIn PDF document text
    • https://megalightgroup.lv/uploads/files/21937926435.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/5utmduv9do9kclatmjmkdv25n1/xuwipoga.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/50663725921.pdfIn PDF document text
    • http://xmzhj.com/UserFiles/file/22289670580.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/035fd2ee84fa701365deeb3bd851f87f/97107815770.pdfIn PDF document text
    • http://newdimension.su/userfiles/file/rikuzeliwonova.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/0c0a56571985ac5fbb79deb17823fd48/jugiz.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/3e664a14043ae2b06e6d7db8fe7c277d/99358220563.pdfIn PDF document text
    • http://neboskreb-irk.ru/uploads/userfiles/files/21033477264.pdfIn PDF document text
    • http://myhomeinparis.com/userfiles/files/pogotolo.pdfIn PDF document text
    • http://exhibitionchannel.com/upload/57536624913.pdfIn PDF document text
    • https://www.singaporemedicalclinic.com/ckfinder/userfiles/files/zixubo.pdfIn PDF document text
    • https://a-1commercialkitchenservices.com/ckfinder/userfiles/files/97142756282.pdfIn PDF document text
    • https://vitanov.rs/files/jawusotomewema.pdfIn PDF document text
    • http://aquarium-kochi.com/app/webroot/ckfinder/userfiles/files/80794520219.pdfIn PDF document text
    • http://budgettranslation.hu/sites/default/files/file/mofedogigoluwusezug.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_off0000e1c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9DB 17652 bytes
SHA-256: a1ab3a97020c6d6f7f3f77c326348976a7515c75e2287c4136d8dc5319454f19
font_02_sfnt_off0001272c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1272C 10584 bytes
SHA-256: 0d4246b6d537cb921ee408f69f2ce98ea85aa4b34ef9347440945296891efcdb

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