Malicious PDF — malware analysis report

Static analysis result for SHA-256 73897b718c4e25e0…

MALICIOUS

PDF

78.6 KB Created: 2021-09-04 23:01:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 908fe4ee274f589b3e1956269caad543 SHA-1: 1fd7e537acbf98ecb72cf6ae3dad560017bdb0c7 SHA-256: 73897b718c4e25e050df2ef67801a11ce2ab276bf4b1655a71335d747604d618
156 Risk Score

Malware Insights

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

The PDF contains a large number of external URIs and links to compromised CMS uploads, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or SEO spam. The document body is heavily obfuscated and unreadable, providing no further context.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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=honda+odyssey+owners+manual+2011 PDF link annotation
    • https://media-get.ru/userfiles/files/namumibudega.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e480e6aad6---todasuronok.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/37601779869.pdfIn PDF document text
    • http://langfordfinancialservices.com/userfiles/files/51490917902.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/e00c3bba6a389858454ed8300ab7b362/nuben.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/e004723a6f329be0383d571153711a43/mikopamurarisigufuparasa.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/glkpac6g3g11k180g0qp0v5gt3/11361855013.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/ku8949cbksnl58l3hsm9cpl1ub/vorimidalodelorobavugi.pdfIn PDF document text
    • http://hycxchina.com/filespath/files/20210804115119.pdfIn PDF document text
    • http://thankschicken.com/uploads/files/xanimopofetu.pdfIn PDF document text
    • http://fbchitchcock.org/clients/8/8b/8bdff38a390027835eb24981312b950c/File/76635504977.pdfIn PDF document text
    • http://xn--kprq5pvqklteonubj6c.tw/CKEdit/upload/files/24765853641.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/88b432028d5e63dfcc5d7b22e11f66a8/59210088590.pdfIn PDF document text
    • http://wtmongolia.com/materials/file/19064937062.pdfIn PDF document text
    • http://moyamoya.center/images/hand_uploaded/files/69919253987.pdfIn PDF document text
    • http://styropapex.pl/userfiles/file/11456879070.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b0b8fe4e2e2---29271889809.pdfIn PDF document text
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/2bf3d5f7578e3c9895b00c3a15b9361e/96854270547.pdfIn PDF document text
    • http://worldprint.su/userfiles/file/90175949069.pdfIn PDF document text
    • http://vinhhangvien.com/upload/files/44652036605.pdfIn PDF document text
    • http://odessawa.com/userfiles/file/87059418092.pdfIn PDF document text
    • http://vetportonaccio.it/userfiles/files/wepoferoxewogejurowa.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/vevj8kfkd3e5lp2auttpt67tp6/nikomepazilosepo.pdfIn PDF document text
    • https://yifff.se/userfiles/file/64203713105.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/qc4tpnil7hu6sr8pahers3pfkq/51363916736.pdfIn PDF document text
    • http://liubeauty.com/luutru/files/29121159824.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_off0000ce33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE33 10804 bytes
SHA-256: 57fcaa1a64f1cbb221d7f2057d2ba5d14fe6d083b12136706ec60351e273e1b6
font_01_sfnt_off0000e739.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE739 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF4B 17932 bytes
SHA-256: 5e8df7d054c289a94319c516041e5eeb4e575671c7d65a821b59e245f570c213

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