Malicious PDF — malware analysis report

Static analysis result for SHA-256 94c9b7a9141811b8…

MALICIOUS

PDF

90.6 KB Created: 2021-09-11 02:50:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e9b9359284af19636df74713522fb746 SHA-1: c591836434f35e2a14dbaba3c060e9db0a912f49 SHA-256: 94c9b7a9141811b8fbfb17b8045bb5b34bbdee8605dbe0e4f254218d5d63e6f4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing trojan by ClamAV. It contains numerous external links, including one pointing to 'oniceh.ru' with a 'grand+theft+auto+3+cheat+codes+ps2' UTM term, suggesting a lure for potentially harmful content. The PDF also leverages compromised WordPress upload storage and disposable hosting for its links, indicating a tactic to obscure the true origin of malicious content. No scripts were extracted, but the overall structure and URL patterns strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://oniceh.ru/uplcv?utm_term=grand+theft+auto+3+cheat+codes+ps2 PDF link annotation
    • http://soldearenales.com/galeria/files/34463783170.pdfIn PDF document text
    • http://agrocare.hu/ckfinder/userfiles/files/77011356499.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16138a45e01d50---fevakixafafekezopuselelix.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/34198425707.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/161317f577a38a---lujunavujobepizofuwe.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b6514bcdb5---54801021003.pdfIn PDF document text
    • http://saovietgroup.com/upload/FCK/file/daborugukizokuxugamel.pdfIn PDF document text
    • http://theaterbuehne-schwandorf.de/userfiles/file/54119383098.pdfIn PDF document text
    • https://littleedupark.com/ckfinder/userfiles/files/24074210559.pdfIn PDF document text
    • https://unitjaya.com/contents/files/57231338886.pdfIn PDF document text
    • https://xyoaa.org/sites/default/files/files/wokaruvijamegojorabiv.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/b145999bad203fe9929159a8934394b9/63225827924.pdfIn PDF document text
    • https://vestol.bg/files/file/tiseder.pdfIn PDF document text
    • http://clinicaveterinariaalbese.eu/userfiles/files/livabutiwanin.pdfIn PDF document text
    • http://trufeel.com/ckeditor/ckfinder/uploadfile/files/12287774221.pdfIn PDF document text
    • http://suachuaspa.com/upload/images-content/files/xolujowi.pdfIn PDF document text
    • http://srmtteaparty.com/uploads/files/202109042300336446.pdfIn PDF document text
    • http://protetyka-lublin.com/images/wyswig_images/file/50765303341.pdfIn PDF document text
    • http://warwick-ems.org/userfiles/file/mejewasidefe.pdfIn PDF document text
    • https://kvzriu.org/images/file/wawolupobofopuvimipimuzif.pdfIn PDF document text
    • https://totalmediasolutions.ae/ckfinder/userfiles/files/64510249537.pdfIn PDF document text
    • https://nepalihemp.com/ckfinder/userfiles/files/xosusajivekodekepako.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133ec7372ce0---xoteledixelu.pdfIn PDF document text
    • https://kimcert.org/E/file/gowojazizumekiluj.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131467cb7da3---50036542175.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_off0000fa69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA69 11012 bytes
SHA-256: 97254be7be5e6adcf4d78ee4e1efc7946d807cd19ca016969cd96d9e9a8c656d
font_01_sfnt_off0001140e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1140E 18748 bytes
SHA-256: e207bb5ed668ee2d3a3f7be12543568f8ba22a5edaba95c03edbea0435763c45
font_02_sfnt_off00014445.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14445 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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