Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e0573d29ebb7b02…

MALICIOUS

PDF

84.6 KB Created: 2021-07-20 13:44:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 734f0d183b787ef1378dc8ab9c62299f SHA-1: 35dea7193a0de4b902836b825de45bae8a16732a SHA-256: 1e0573d29ebb7b0277c4326c2ab29ec58a746f165f074b416e4e08cb882099c9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous URLs pointing to external resources, with several hosted on compromised WordPress upload directories. The presence of these links suggests an attempt to direct users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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://olimpic.hu/ckfinder/userfiles/files/zutoxezudobawofege.pdf In PDF document text
    • http://recrute.fr/files/files/furinufinafadafuxadiboxew.pdfIn PDF document text
    • https://mexico-airport-transfers.com/ckfinder/userfiles/files/82042084600.pdfIn PDF document text
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/riduwugiduxemuwog.pdfIn PDF document text
    • http://skincarebylaura.com/clients/862251/File/19509121210.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/3284213272.pdfIn PDF document text
    • http://ukrainski-rosyjski.pl/userfiles/file/95137786257.pdfIn PDF document text
    • http://arcos-eff.it/userfiles/files/zonivedaleruduwipusudo.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/16071b476cf0ec---65246418791.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607da9eeb2667---ruxamatevi.pdfIn PDF document text
    • http://studiozammuner.eu/userfiles/files/14184209343.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/762tsr5a9ulpj70gdpjn3pjts7/nupufisu.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/14080183522.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1521f5df2c---zejiripuzojorojakorok.pdfIn PDF document text
    • http://tdvvietnam.vn/webroot/img/files/76088175815.pdfIn PDF document text
    • http://tai-yang.tw/taiyang/upload/file/levajuxivovefakexarolage.pdfIn PDF document text
    • http://www.tsahimmongol.com/uploads/images/files/74102502870.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2538305f2c---59882229617.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/turugulakebunumutavurosuz.pdfIn PDF document text
    • https://easresidence.ro/app/webroot/files/userfiles/files/jupebomowesunojefego.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/16096444d1e860---rasuwagarutipizimiguv.pdfIn PDF document text
    • http://zonweringbelgie.nl/ckfinder/userfiles/files/darunevegarijobo.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/868q2lf2106gkgrl7cpni8p1pi/35548783332.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bd6c994469---farilidigurixuxafabope.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=2+to+1+fadePDF 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_off0000e913.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE913 9912 bytes
SHA-256: 1692ed72d67689108082174f4149988d6127232dd60b6ad1d9e9dc9a71c00cef
font_01_sfnt_off0000ff27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF27 17204 bytes
SHA-256: e2ece44341a9f8c619bbe292511692ca60e548e8c675b3913a4fcc47d38495a9
font_02_sfnt_off00012c3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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