Malicious PDF — malware analysis report

Static analysis result for SHA-256 75905013089f7bdd…

MALICIOUS

PDF

99.5 KB Created: 2021-09-20 22:33:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 28a61814a5d6f794c0e66f7b284add9e SHA-1: 972a29ce9999411f083f12069a14b0575882e399 SHA-256: 75905013089f7bddc11a8f704d314e9c8cf26f1898bab57f4dcf7bfbfe1a0f9b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or disposable hosting, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to phishing sites or download further malware. The presence of embedded JavaScript (T1059.007) is a common technique for exploiting PDF vulnerabilities or initiating malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9678

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
  • 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 https://allytemp.ru/uplcv?utm_term=watch+kimetsu+no+yaiba+mugen+train+full+movie+online PDF link annotation
    • http://bancasemecanino.com/userfiles/files/vosokozitobalotexonape.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/vehim4pjs04n659g7jrgobp8ed/81721659064.pdfIn PDF document text
    • https://drinkpoint.com/uploads/files/46301311518.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/161433fe64419b---najopitar.pdfIn PDF document text
    • http://mudrberanova.cz/userfiles/file/lusonazitetikidugonoj.pdfIn PDF document text
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/53288005121.pdfIn PDF document text
    • http://risme.vn/files/vebewetimadulibuv.pdfIn PDF document text
    • https://mvmdigital.gr/files/files/57509515978.pdfIn PDF document text
    • http://gymostrov.org/gymostrov/userfiles/file/lasawipa.pdfIn PDF document text
    • https://ukmriptek.org/codeIgniter-hmvc/userfiles/files/2157525756.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/tomuqqe2qrihao2dibgop4qqge/dofoso.pdfIn PDF document text
    • http://garage-fuji.jp/js/upload/files/43120490798.pdfIn PDF document text
    • https://www.aukuras.org/ckfinder/userfiles/files/33406903533.pdfIn PDF document text
    • http://lonniestireandauto.com/nbloom/fckuploads/file/turajov.pdfIn PDF document text
    • https://rsun.pro/admin/ckfinder/userfiles/files/tefexumuwakiwopekesubaz.pdfIn PDF document text
    • http://mallenmediations.com/mallenmediations/images/userfiles/file/kanifepo.pdfIn PDF document text
    • http://jia-longsofa.com/uploadpic/jialong151126/files/202109171351593534.pdfIn PDF document text
    • http://studiocinti.eu/userfiles/files/14206868153.pdfIn PDF document text
    • http://color-gateway.com/userfiles/file/68076408626.pdfIn PDF document text
    • http://garagehayashi.com/js/upload/files/78129225274.pdfIn PDF document text
    • https://gadesign52.com/uploads/files/202109021657032825.pdfIn PDF document text
    • http://cpghollywood.com/userfiles/files/garezuzo.pdfIn PDF document text
    • http://awards.nl/img/cms/file/vusulusopufatim.pdfIn PDF document text
    • http://ristorantebiscione.com/userfiles/files/53322603511.pdfIn PDF document text
    • https://marthomaktrplrdiocese.org/ckfinder/userfiles/files/37526588646.pdfIn PDF document text
    • https://newegys.egyseg.eu/ckfinder/userfiles/files/liputobaliki.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010e95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E95 11288 bytes
SHA-256: ae6e62307231e68df52905c6bc0d56c283564b9467561d493d3799e5bb4c5818
font_01_sfnt_off00012906.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12906 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014113.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14113 2180 bytes
SHA-256: 270ae547dc90e2207aa0a92c4c1a5bbf5c5d348c86bb178d5b8648ce7fc816c8
font_03_sfnt_off00014af1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AF1 20140 bytes
SHA-256: 811f8a2f8ba6240be7dbe0bb24d1cef178043aa19bfef6e0f55418eab86b158e

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