Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2a0b3d9225b0ff7…

MALICIOUS

PDF

103.3 KB Created: 2021-08-08 17:49:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b025544849197ca7bd95a199dee48718 SHA-1: d1e96d9cb6f8add45819a8a48fc79e4a0e6dac6c SHA-256: f2a0b3d9225b0ff749e508af40f4fc9ca948b5069d492922bdc478f0347eb47b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised or disposable hosting. The PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicate a deliberate attempt to obscure the true destination by using a link farm. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are often used for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://boissee.fr/userfiles/file/sarerupeminuv.pdf In PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/65853436886.pdfIn PDF document text
    • http://banghaija.com/userfiles/file/51501553761.pdfIn PDF document text
    • http://positiveforce.in/uploads/files/fapejadug.pdfIn PDF document text
    • https://bhandarisurgical.com/ckfinder/userfiles/files/lipudakuxusi.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/sau4eg3ojcfh3pu44fg7ftor49/xumisizaxupakifajiwewova.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1610a736d9d173---36881878620.pdfIn PDF document text
    • https://chennothinterios.com/uploads/file/balikufug.pdfIn PDF document text
    • http://www.almansori-ye.com/almansorifiles/files/guriz.pdfIn PDF document text
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/27ea689fb129688dc5fec90f8f3310bf/48433043065.pdfIn PDF document text
    • https://sunnyvale.com/wysiwygfiles/file/4796356235.pdfIn PDF document text
    • http://moorheadhigh1970.com/clients/c/c3/c3beaea4c2dff0dfe15f0c96d12524a1/File/muneverokuf.pdfIn PDF document text
    • http://conservativista.com/js/ckfinder/userfiles/files/3884420194.pdfIn PDF document text
    • https://123natura.com/stockages/files/bakigudanafev.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/baorjcbv9j076ra3huujdjngs2/64379695613.pdfIn PDF document text
    • http://hykylalumni.org/userfiles/vigawidoba.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/zutejuxovibiko.pdfIn PDF document text
    • https://drddvichitra.com/userfiles/file/dowojeforomafug.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/fonakaglgfo09i7oviu5kj6g4c/xokugowiv.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d85ddba4b5---48848851956.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/9d68472489f6fdc125c6627d13289a6d/54097596551.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec4b4412be---dizefakunosilewuvusitufan.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd5e977e61---bikodulelusoxajiw.pdfIn PDF document text
    • https://rh4-h1tapi-turbo.com/contents//files/80606137726.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=maytag+bravos+washer+owners+manualPDF link annotation
    • 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_off00012a73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A73 10960 bytes
SHA-256: 7c680d26c26354df08d44228cf14e2cf9421d8688c834679150cda9ac4c0a2b7
font_01_sfnt_off000143d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015be8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BE8 19640 bytes
SHA-256: 7353040d10a381b384e06f67044ca6a2dd4f6eaf8a6f49dd4771064a396f6c2a

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