Malicious PDF — malware analysis report

Static analysis result for SHA-256 f39c60223870a97a…

MALICIOUS

PDF

89.0 KB Created: 2021-09-06 16:05:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 48df6153e0ea59b2f8ba889a09e6d185 SHA-1: eee7c683091d95424ca85801d2e242ce150a40fa SHA-256: f39c60223870a97a3f1e13043fc7b5cbbea6c36412d6d187e73ebe3d854e3ef8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm. The presence of these links, combined with the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic, indicates the document's purpose is to redirect users to potentially harmful external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://medvor.ru/uplcv?utm_term=fujitsu+mini+split+install+manual PDF link annotation
    • https://connatlas.com/home/conn/public_html/ckfinder/userfiles/files/98712760896.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/607941d98187c9899e161c2db1c789f6/54451589483.pdfIn PDF document text
    • http://www.tramag.pl/upload/file/pekigotakijenamobapirazof.pdfIn PDF document text
    • http://rfaaa.com/UploadFile/file/20210816231119982.pdfIn PDF document text
    • http://stevis.cz/files/file/vutibejaxufulekuw.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/b5dd0ed2527106ee834f6effff8ce972/lisodivopoxofeligukar.pdfIn PDF document text
    • http://riccaassociati.eu/userfiles/files/18128468498.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/b68be59969d48aa74ad97fb67deab371/36530750912.pdfIn PDF document text
    • http://jessie.vn/images/ckeditor/files/34252883802.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/78736323193.pdfIn PDF document text
    • http://uss100.com/clients/5/56/562308f4da1da23328cfd9e5c9f3e68f/File/mukavigabavitodojeg.pdfIn PDF document text
    • http://www.gabrielamaciel.net/images/content/file/zinaginifiminaxugafexig.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8cc54a9e9---31492255002.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2a683a365---73175277457.pdfIn PDF document text
    • http://studioboscono.it/userfiles/files/40774817830.pdfIn PDF document text
    • http://poorclarescork.ie/images/gurojiwelo.pdfIn PDF document text
    • https://theelementrama9.com/userfiles/files/73224406006.pdfIn PDF document text
    • http://faizleathergloves.com/userfiles/files/bedotetinuvinajo.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/9109e7ed9b4b660d442ee5151ddfebdf/pagawimesajomiriwazanilel.pdfIn PDF document text
    • http://ferramentabelleggia.it/public/file/2998906733.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/9a934ea048611c3de3c39af500dba291/zavunaneledafatisajuf.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/64706645397.pdfIn PDF document text
    • https://troypin.com/calisma2/files/uploads/farajamegibegarifasi.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_off0000f281.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF281 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A93 20108 bytes
SHA-256: ad92eab052d4356baa0977820f8e9cec64b525a074b21672f60f6cda9d4eba22
font_02_sfnt_off00013f04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F04 10268 bytes
SHA-256: 55c63d7c0cddc147cf5aebb9c0cc960855b223ad8709e0bde16a785744ee6151

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