Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b25c9d766206c5b…

MALICIOUS

PDF

81.2 KB Created: 2021-06-28 17:50:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d0da3e1b2f1f00e849f097845a262c2b SHA-1: f7ca86e258547c09bf6abca54c42e7a8da2c0ceb SHA-256: 0b25c9d766206c5ba7c3f64e5c305d13ae4db2dcea4c973d442355e77cc8fb08
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content or phish users. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://irlanc.ru/uplcv?utm_term=another+word+for+longitudinal+wave PDF link annotation
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/39r9pccuaq60susr67v2ddavus/nojemitozidudugiw.pdfIn PDF document text
    • https://fanaf.comarticle_ressources/file/kepexazixagadam.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a43beedeb08---kibibumibixivuv.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/40739045838.pdfIn PDF document text
    • http://phrabat.net/UserFiles/File/titonafironobona.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/2df83c88c78321814f57d934ea5fd7ee/51243000351.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/bazaxikuwotuduf.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/wopenebus.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160b82cc95ad71---98770481192.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb98c82cd5---89809699330.pdfIn PDF document text
    • https://vmwarts.com/ecovic/file/sebijimerabuwemiluvewim.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/paxelax.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/4fc452eb6e21a20e2c2b9918342866c8/84026553636.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/zepurixerofim.pdfIn PDF document text
    • https://mk-sito.it/uploads/file/kubivalapano.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/suxifiwiniwuwula.pdfIn PDF document text
    • https://castilloexterior.net/ckfinder/userfiles/files/nejel.pdfIn PDF document text
    • http://emilygrilltogo.com/uploads/files/sudufovo.pdfIn PDF document text
    • https://virtualpulse.eu/UserFiles/file/19140724666.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e754f34080---fukekugimagifolebewo.pdfIn PDF document text
    • http://maytinhtuyenquang.com/home/maytinhtuy/domains/maytinhtuyenquang.com/public_html/images/file/vemidimemaxanaj.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/13976559030.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/berarawubin.pdfIn PDF document text
    • https://rockdental.co.uk/wp-content/plugins/super-forms/uploads/php/files/26869ad741fa0f5122631c58efa93125/50414860279.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bf6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d782.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD782 10700 bytes
SHA-256: ef37082fa04dbb91bd53e17c853c46b53388a54c5bda646f0abbabeee4a9503e
font_02_sfnt_off0000efd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD5 16064 bytes
SHA-256: 313b4d1b1f982e25284d2f4e6caf7c0c7767db1f375da95b613bc7d89e59efd8
font_03_sfnt_off000104e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E7 18844 bytes
SHA-256: 235214659f7868fd88765f000a524872ea8186b75ba4187320c4e8607222fddc

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