Malicious PDF — malware analysis report

Static analysis result for SHA-256 a06b313ce95d003b…

MALICIOUS

PDF

113.4 KB Created: 2021-08-01 10:11:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5b14ddca6075172e204be3bc63fce585 SHA-1: ac5198337cea6fd639029843808114d153c04b54 SHA-256: a06b313ce95d003b5ab434478fea0cac7859b0ba98db72e0c7117462c6c09e9a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, which is a common technique for executing malicious code. The sample also exhibits characteristics of a link farm, with numerous URLs pointing to potentially compromised or disposable hosting, suggesting an attempt to redirect users to malicious sites. The ClamAV detection and ML classifier further support its malicious nature, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://bienenaktuell.com/sites/bienenaktuell.com/files/file/zerugidalejupimofopaw.pdf In PDF document text
    • https://pt2-turbo-j3t.com/contents//files/65899921708.pdfIn PDF document text
    • https://h1t-url12shio-turbo.com/contents//files/javasuvewuwixuxuwedoni.pdfIn PDF document text
    • http://em-mould.com/ckfinder/userfiles/files/57388326512.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6f2378796---43020480616.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/38a5456be112c282fceea4149f6b9b56/wapubixepuket.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/f9be1ac96cf091127b48776bc27134bf/19424242015.pdfIn PDF document text
    • http://m4klynchburg.org/clients/3/34/34420611de4c9c7593cf5e5fe12de6df/File/vorumikapeleniforikosa.pdfIn PDF document text
    • http://evergreendentistryva.com/app/webroot/js/ckfinder/userfiles/files/13130464783.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210502075332_1001109496.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/aserpp4h17v79a1p190tg58dbg/lijobifuli.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160848d7dee304---pimofinonobijabadejar.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082a1473292a---52402115642.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/mezuna.pdfIn PDF document text
    • http://tandprotheses.com/ckfinder/userfiles/files/3706595947.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/445fe876e37c4011db152366d8c96498/vaxaxitefikeni.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/bfcc4c42b5c57fa45633fd58eeb775a9/rulik.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/powijisexe.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb3651f32e---80929485903.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/1c5f467a84c73fa87da2f3158685b3f5/rewat.pdfIn PDF document text
    • http://chelseacarpet.com/ckfinder/userfiles/uploads/bofosisamuniwilol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=from+dictatorship+to+democracy+pdf+downloadPDF 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_off0001579b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1579B 11064 bytes
SHA-256: ed311db34107c60ddc95429f537b8243a0eff546e9b560727e166be6a2afbf65
font_01_sfnt_off00017139.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17139 17376 bytes
SHA-256: 172a97466d0a944b9bbcb372bb75ba414d560adaf6a4256ac7e18b59396be879
font_02_sfnt_off00019ee7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19EE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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