Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ad2a7bf0154657f…

MALICIOUS

PDF

268.2 KB Created: 2021-07-07 16:21:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 0540192fa2e6640c08831247d296c08c SHA-1: 0e6cc6aaa14c276237d3dfb9c17f90c47840acc5 SHA-256: 9ad2a7bf0154657f16b155c9a0281ca43f5c6e131711a71d7aa22cb3435b50e8
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it is a phishing lure, specifically using redirector links to compromised CMS uploads. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded URLs, such as 'https://inwebjor.ru/uplcv?utm_term=funny+legalese+example', are likely used to redirect the user to a malicious site or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9798

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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.
  • 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://inwebjor.ru/uplcv?utm_term=funny+legalese+example PDF link annotation
    • http://alexhofford.com/temp/files/file/ligesigerezux.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/bebawunus.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/rugv1gms0tqftsfr0bntnbesiu/rovomogozo.pdfIn PDF document text
    • http://chrisdepanneservices.fr/Sites/cds/files/todobamore.pdfIn PDF document text
    • http://aapltd.net/userfiles/file/37452746225.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b4bb2a77117---79362103445.pdfIn PDF document text
    • https://solener.info/ckfinder/userfiles/files/dunilajovoj.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/2g9f6eu75k8fn7ub0m2to5slgh/xiluwakuti.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087638a3ce4d---gusoxalabokegodi.pdfIn PDF document text
    • https://abeess.com/userfiles/file/12396399163.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074b78488481---8172533767.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c000432a583---porukumosakokar.pdfIn PDF document text
    • http://alconburyreunion.com/clients/36523/File/55536715861.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab492fe49ff---tejejavolifuwig.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16072e2360953a---89411606906.pdfIn PDF document text
    • http://win-sonic.com/kida2018/ck_imgs/files/32313316098.pdfIn PDF document text
    • http://upservice.expert/admin/ckfinder/userfiles/files/pites.pdfIn PDF document text
    • http://thebrownsfamilyreunion2008.com/clients/81208/File/63432834659.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086706f74d24---22958504768.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/773mu070923hqq7rk7u2hfje7u/temuxuvazababanuwite.pdfIn PDF document text
    • https://monyetmesum.com/contents//files/wavinif.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/n6t0kt5fce5fl4fj3fb00uvh8i/lisoxebabafovux.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/xunupilusiwudekinila.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab61bfcd82c---32266205275.pdfIn PDF document text
    • http://kino-cosmic.ru/sadm_files/sijumaduzuretuxi.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_off0003c610.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3C610 17532 bytes
SHA-256: f1c4ad9bbec4cac2fa88a67cbe2765f988650dc29a09d6991fddf0c408ee2518
font_01_sfnt_off0003f397.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3F397 10480 bytes
SHA-256: 927a9e1eb3e79ac53d619cc1a40a2777e4f41c5197b0a27f9d65b96f96110aa1
font_02_sfnt_off00040b70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x40B70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1