Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9a9b434df096588…

MALICIOUS

PDF

113.3 KB Created: 2021-06-30 14:23:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: fe9ee98bc8fd1d00b36ee88bcdac47c5 SHA-1: c3ff4373867e7e4981f1cb300c94227866cf78ad SHA-256: c9a9b434df0965883efe557f3917f9455ffddab1d1daada62e7c0f6dba985387
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, indicative of a link farm used to obscure malicious destinations. ClamAV detected this file as 'Pdf.Phishing.Trojan', and the ML classifier assigned a high probability of maliciousness. The presence of embedded URLs and the nature of the link farm suggest an attempt to lure users to phishing or malware-hosting sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8732d3b83---2352428322.pdf In PDF document text
    • http://altinay-law.com/images/file/jaxajebasonekuguzuviraduz.pdfIn PDF document text
    • http://www.tecnobor.com/ckfinder/userfiles/files/45682370492.pdfIn PDF document text
    • https://intrigantka.ru/images/userfiles/file/51583060992.pdfIn PDF document text
    • https://zionapostolicministries.org/uploads/file/38285553374.pdfIn PDF document text
    • https://coimbatorepressclub.com/FCKeditor/userfiles/file/1651273577.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16083191c06c39---lovinekejonolut.pdfIn PDF document text
    • https://www.nexidia.it/wp-content/plugins/super-forms/uploads/php/files/90719a2e8aba23118d94cbea04abce4a/lafikenijobesorax.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/d3mmhdiek28pckknt2ejhi0jb9/88203219197.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/d2303768d53580430e6a08896d56f5db/25011939930.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/moralidatina.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/wanug.pdfIn PDF document text
    • http://johncarroll1967.com/clients/1/18/1896e795ecc2602204d707ec4e69586f/File/mufasu.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3e93c06ab---dukevu.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/54168670599.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608421f974f39---falilidex.pdfIn PDF document text
    • http://mbcasc.net/imgs/file/74184256299.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16087694dc67a6---70815908612.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/phrf3jtkao2dab7niij8o3624a/piforab.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9b4dabc45---wizegufajinenab.pdfIn PDF document text
    • http://ahsaipu.com/v15/Upload/file/202155533505218.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=my+little+pony+equestria+girls+summertime+shortsPDF link annotation
    • 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_off00015876.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15876 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001708d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1708D 11052 bytes
SHA-256: 184720bacb689dc8d532e99b044016627e2505a8a6d499a963a13aa180f2ebc1
font_02_sfnt_off000189c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x189C6 17092 bytes
SHA-256: 992509aa316f39d51dba2059276fe3c7ab94cac02b795140185ee1dd9df1ae1b

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