Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9e979569b3e3f1f…

MALICIOUS

PDF

92.3 KB Created: 2021-07-31 04:59:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f19b9fd2c858d1fa34ad3a47a9c6baa2 SHA-1: 1c1a51c2b2f1294a72d7c6d1f014f95166735852 SHA-256: f9e979569b3e3f1fa44647ec87b01653315116146b21ba03cc3b190617896c85
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to compromised WordPress sites and disposable hosting, forming a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were directly extracted, the structure and URL patterns suggest the PDF is designed to lure users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://pistant.ru/uplcv?utm_term=reticular+activating+system+and+goals+pdf PDF link annotation
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/61o6ofojc2pkdr1j4pt3qvihs7/danovulekoxo.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/74760216740.pdfIn PDF document text
    • http://spearsyounglegacy.com/clients/b/b2/b2c23f164518415ec8f3c1c8d0af542d/File/33573731896.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/63ea42f0b87974b15583f39db8eeb7c7/pekadulesoguzasile.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160805f7dce29a---85549562596.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/migawolexiwipemogubodi.pdfIn PDF document text
    • http://debandhelder.nl/ckfinder/userfiles/files/68095336894.pdfIn PDF document text
    • https://arhometutor.com/userfiles/file/suwomu.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a53db107a34---50000656772.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607142cdc3da3---xegitika.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c0d67ce4d76---tifusagepoto.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/2840a9aad8298952ddb6fbbe823aaf59/xutubowuk.pdfIn PDF document text
    • http://ip-golubev.ru/ckfinder/userfiles/files/95625218430.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/17525519599.pdfIn PDF document text
    • http://netmutum.com/userfiles/file/87539727988.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/eb008e2cecb34a7209b631b7092f2f04/24155720176.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160aa589e0c838---popenafabogoxi.pdfIn PDF document text
    • http://valeneighbors.com/userimages/logazigikazifimi.pdfIn PDF document text
    • http://deeringbayrealestate.com/userfiles/files/54640831422.pdfIn PDF document text
    • http://local-minicab.com/survey/userfiles/files/75027335252.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/50003742983a88f21cf22dd47aafc664/56409117266.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eeba74c5a3---13462708419.pdfIn PDF document text
    • http://ewinghighclassof1963.com/clients/e/e4/e4cb61fc1babc639533983e887b7272d/File/77543082194.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084eb1425c3e---84944705613.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_off000103ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011be0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BE0 16560 bytes
SHA-256: fdd6d9ef939d6ffce34ec23aa5668748bed2bf91d558913e4e6de95cc630927b
font_02_sfnt_off000146a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146A9 11288 bytes
SHA-256: c3ff8179c39546a8d7e1dc72153a52c7f87ef668fe8159ca10be88253f2079e4

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