Malicious PDF — malware analysis report

Static analysis result for SHA-256 95e690249ffd4e58…

MALICIOUS

PDF

106.2 KB Created: 2021-09-21 19:57:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 80f245d8f3980b7ad072d2305e28b459 SHA-1: 0eb4ce3ebf57c4c6f3b4feee9fcace455e5f6b4b SHA-256: 95e690249ffd4e582f3adb81b3d0630d75c2fc19c4f6481ae3da0f893b5000d3
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically identified as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on potentially compromised CMS uploads or disposable domains. The embedded URLs and the nature of the link farm suggest an attempt to redirect users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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 http://terrietanaka.com/library/files/42051703287.pdf In PDF document text
    • http://vervesimuhub.com/userfiles/file/kakotanofekoz.pdfIn PDF document text
    • http://metapolar.hu/tmp/xipaninixinebopifikeged.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/ledusakikebeme.pdfIn PDF document text
    • http://ledlight-lamp.com/mingyi/images/userfiles/file/sujagezagibokobadixoluma.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/58145100233.pdfIn PDF document text
    • http://bio-scan.com/userfiles/file/76762034127.pdfIn PDF document text
    • http://barsugo.com/ckfinder/userfiles/files/gusopubasesifuvoxo.pdfIn PDF document text
    • https://plewmal-d.com/Uploads/files/fajagujobonunenewititu.pdfIn PDF document text
    • https://toananhmedical.com/uploads/files/74012138018.pdfIn PDF document text
    • http://pathtojanna.com/userfiles/files/85638621542.pdfIn PDF document text
    • https://bongkartuantakur.com/contents/files/kozerikujitoloxazas.pdfIn PDF document text
    • http://lamorenj.com/userfiles/file/xotinojolomabaj.pdfIn PDF document text
    • http://rowadhr.com/app/webroot/upload/files/ladugivitewunexifalevoz.pdfIn PDF document text
    • https://matras-matrasych96.ru/admin/ckfinder/userfiles/files/fuwusevufonumekuvumag.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1ca4bd8d1---gelunidopelukoxili.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613147b1dcce3---69831375749.pdfIn PDF document text
    • https://www.benkorner.nl/admin/library/ckfinder/userfiles/files/18619170098.pdfIn PDF document text
    • http://sspvjd.com/FileData/ckfinder/files/20210909_152516BFDCFB3816.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/161496477aa5f5---nemit.pdfIn PDF document text
    • https://beyondpins.com/calisma2/files/uploads/75204227181.pdfIn PDF document text
    • http://www.eurosecurimed.com/ckfinder/userfiles/files/gixisemuki.pdfIn PDF document text
    • https://lotte-ppta.com/beta/assets/file/ritepanufaximi.pdfIn PDF document text
    • http://123podkrovie.sk/editor_uploads/files/95834659057.pdfIn PDF document text
    • http://erdbau-rauch.at/54621646460.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=elements+of+graphic+design+pdfPDF 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_off000135da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135DA 19628 bytes
SHA-256: 71fc33e47db56dfc48098a8d7bdbcee83c8c87b950c8f3ab3ee229060c599e22
font_01_sfnt_off00016927.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16927 11048 bytes
SHA-256: 67d23c3113363ab7f994eadf19a49692174f7827756f3ddab9f7a15f049b7577
font_02_sfnt_off00018272.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18272 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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