Malicious PDF — malware analysis report

Static analysis result for SHA-256 df2f4d6bfd5270a2…

MALICIOUS

PDF

87.7 KB Created: 2021-09-03 19:33:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5a5ea493f8f7ad72eef5f214d54aa195 SHA-1: b0ab2b8a783c552e3ab0efb583d95a334f2ddd06 SHA-256: df2f4d6bfd5270a227c8eff4c2c78b562661c62273ea3fad3a17d5e69852613e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates the attack by hosting these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://coretry.ru/uplcv?utm_term=datasheet+lm350t+pdf PDF link annotation
    • http://residenceraffaellotorino.com/userfiles/files/72646672817.pdfIn PDF document text
    • http://ipost.mn/ckfinder/userfiles/files/14245322297.pdfIn PDF document text
    • https://questyme.com/userfiles/file/sivilunuxopotag.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/275a7b5b69007076d8f609d24eb2696f/18983207337.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/midawonibiweravozafunezu.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610e49da845a7.pdfIn PDF document text
    • http://thrifty-uy.com/files/others/xutedavexigilubewuluf.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160afc8a378633---50379426648.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ffb027db173---37668614371.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/rc7narhdcjiub6j2c9fin3411k/10032802104.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/a17599b5a44f963d1dbe25ea53fb663b/wenepefewunepewadow.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/b8245db8e726e0508aef53ced1d498c6/dijulokopesavolonofo.pdfIn PDF document text
    • https://gjbuyerbroker.com/userfiles/file/96885672392.pdfIn PDF document text
    • http://daphongthuyhueminh.com/uploads/image/files/59482910165.pdfIn PDF document text
    • https://businesslife.com/content/file/dinumivaku.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/tugusowowisakaw.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/21160559185.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f845cd0bf9---topulegodobudur.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/zovarufukigaluzufagip.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/kqm9lplmn2vuq1qt7vn0rf7rkn/29608815716.pdfIn PDF document text
    • http://rltclassof1970.com/clients/8/8f/8ff9f19c840b982a6efda18ba8bb483c/File/wuguvanitomim.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_off0000e9e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E3 10776 bytes
SHA-256: 3c1edd1a859699d517de3663f2ab705286886de69fb256ba4f54773283c0a170
font_01_sfnt_off000102cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102CB 20976 bytes
SHA-256: ebd01ed7060f9ab0a573fd4bfd5162ed88689e80b1e9702baeb8f30dcfb9e188
font_02_sfnt_off000139c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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