Malicious PDF — malware analysis report

Static analysis result for SHA-256 e799fa48759a5bdd…

MALICIOUS

PDF

89.9 KB Created: 2021-07-25 13:01:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1275c99599bedbdbf8880782c9dc8f06 SHA-1: 42928c73f753e0490a51ee406d4c246e52655d67 SHA-256: e799fa48759a5bdd68c18610ba6b4bc40455afca6c82816063a066053fafab7e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. It functions as a link farm, containing numerous URLs pointing to compromised websites, likely intended to lure users into downloading further malware or engaging in phishing activities. The presence of external URI links and link farm indicators strongly suggests a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/39e90f622bbed3637a2ecdb89c08c61f/20056139090.pdf In PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160793a925dbf7---gurujubo.pdfIn PDF document text
    • http://kistours.hu/userfiles/file/gagedakojajejesogetifebon.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/5jgi8n00s5at3toeqcr85nuab0/12842052070.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160787970a304c---pozipibepemigagugaxoxaza.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608c1fe0d3986---34176123855.pdfIn PDF document text
    • https://chung-pei.com/userfiles/file/mafuvigefemabutatitaf.pdfIn PDF document text
    • https://ivanamihic.com//files/rurevusisinajixidev.pdfIn PDF document text
    • http://stavclearing.ru/upload/files/92796594459.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3012758ae8---jabatafizakefetumevuvof.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/4d6287006346479746b00ce2c4960b16/wabipebijidofovosen.pdfIn PDF document text
    • http://hoteldarim.ir/basefile/hoteldarimir/files/80986065141.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/0f5f9c01d654a9a2d761272d69c9a480/95943071064.pdfIn PDF document text
    • http://celiapopememorial.com/clients/4/45/45605e685ba8a3b32f56966823665796/File/22944610200.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce357c2493---naxiwidobumop.pdfIn PDF document text
    • http://www.edgartownschool.org/uploads/files/95760349667.pdfIn PDF document text
    • http://abnicum.com/files/file/45556386277.pdfIn PDF document text
    • http://mamnonkitty.com/webroot/img/posts/files/vuvagoxasagorufeju.pdfIn PDF document text
    • https://soportedevida.mx/ckfinder/userfiles/files/sijuniretixefedulidafibef.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/jewavovopebekod.pdfIn PDF document text
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608061483bf6a---92674277352.pdfIn PDF document text
    • https://grandhotelbulgaria.com/userfiles/file/tizelak.pdfIn PDF document text
    • https://www.deuba.info/wp-content/plugins/super-forms/uploads/php/files/kl2rqg1rrg1kvicmeptrjvsmek/18203378601.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=solidworks+flow+simulation+training+manual+pdfPDF 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_off0000f625.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF625 11060 bytes
SHA-256: 7be223cc7c5ed5ea38c3a8383f28d91b1b481e83ddd384a35064abe7c8e27087
font_01_sfnt_off00010fb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000127c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127C5 18556 bytes
SHA-256: 23538fbacfd68d0e0ebba4ea70daf1b5a6584dd12f3a55d0d91a82aa0098cfd1

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