Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2957eee98063e6b…

MALICIOUS

PDF

90.0 KB Created: 2021-07-28 14:01:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f03e8e0c43702468167580ec01d5aa26 SHA-1: e2c1cefb556b46057c86463ac4ee27fb6d791a8b SHA-256: e2957eee98063e6bd3a47f9c2662d8f95f773a24228a7252b1054750a68a9a28
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple compromised WordPress upload directories and disposable hosting sites, likely intended to redirect users to malicious content or phishing pages. The presence of numerous external URIs and the 'link farm' heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://bedandbreakfastchia.it/userfiles/file/54831856284.pdf In PDF document text
    • https://www.sibirprokat.ru/ckfinder/userfiles/files/netipij.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bcfe5297698---90187627577.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/40d16cbcd77c0c6b767132fb738070e7/18642473601.pdfIn PDF document text
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vemaliboxajoxitasunuzuw.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609002b8a0d93---dusufaxuxifavatig.pdfIn PDF document text
    • http://gsxr.hu/userfiles/file/55394233222.pdfIn PDF document text
    • http://innovad-ltd.com/userfiles/file/navusiga.pdfIn PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/74226704038.pdfIn PDF document text
    • https://www.comperat-89.fr/ckfinder/userfiles/files/wisagasaxafiketorujuju.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/c80ee2977541d20fe15709772379e1c5/povomonezumowarepufa.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/nuxazegevuz.pdfIn PDF document text
    • http://proxkimya.com/resimler/files/10685862530.pdfIn PDF document text
    • http://alde-pace.org/ckfinder/userfiles/files/25478210953.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/824f2c69b5f9b07ac5d82241b2828c95/17094123406.pdfIn PDF document text
    • http://faulkfamilync.com/clients/c/cc/ccb94402b1eed20a0583117be0c0b506/File/monuneru.pdfIn PDF document text
    • http://shuimotongyuan.com/userfiles/file/xufugujekufigul.pdfIn PDF document text
    • http://msamerica.net/clients/873634/File/27138344374.pdfIn PDF document text
    • https://fultoys.com/userfiles/sikexutixibonitidad.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c9287e6e5cf---sebusozozavatisofog.pdfIn PDF document text
    • https://agrimal.pl/userfiles/file/kojesitiburiz.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160ffa0963dc3f---bivinetateduviragaso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=dell+battery+meter+download+windows+7PDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8d4f6a1b95---70997310929.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_off0000fd5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD5E 16532 bytes
SHA-256: 5113cd0978d68a504a05a7768804bd5ebc0963e930c733e5bf4f81173daa147b
font_01_sfnt_off0001282a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1282A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014041.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14041 10800 bytes
SHA-256: d59c18f01f0416e28e2e576b1a621b196389fa78a49c7f03f07a196c1b952fd3

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