Malicious PDF — malware analysis report

Static analysis result for SHA-256 81800b7933100e13…

MALICIOUS

PDF

72.2 KB Created: 2021-09-04 23:30:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b8f5830d8f375ab33a4861c191a528a6 SHA-1: ff1c60402b296e0a033b7cc148ffa7ee69f8abcb SHA-256: 81800b7933100e13689f876b89161fb02f2d1c8318f04271bdb22e9b363ad7bd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS uploads. The embedded URLs and the nature of the link farm suggest an attempt to direct users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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 http://nashcentralfalcon.com/clients/d/d5/d5bea9c86035def548a020f7371d19fe/File/farabadutabexutebuvotujar.pdf In PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/96b5d08c5c175bf66481cc84d7c79945/84974270752.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/22442895217.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e904069a1---79492941557.pdfIn PDF document text
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608423d3bf3a7---supuxazaget.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/0afa6b2f29ab4deeaebaab4eeb2812b2/64176715825.pdfIn PDF document text
    • http://jingluo.net/uploadfiles/files/12000817020.pdfIn PDF document text
    • http://195exim.com/datas/files/85417148388.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/qllur8dkj8kkv12kavvqr1i8sb/21252481298.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160868fdac7968---rokenutoxuzewudesebujivi.pdfIn PDF document text
    • http://dhf-china.com/d/files/64430193506.pdfIn PDF document text
    • http://helenhotel.vn/upload/files/solekakajorefa.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/87dulvl3jbe8p934i34cn4p78d/20401302027.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/k100fmbvhshi0f8ul6ossnf1o6/54155820546.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/ad2461137c833267c6425f3be2298869/27842972152.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/nin624n0kp22g732312cgbc00h/xewukujafazufidok.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160bb2b12ab88a---sasavivezoxilenibelud.pdfIn PDF document text
    • https://colegiumaniucarei.ro/ckfinder/userfiles/files/joruwuparoriliv.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c988ed18c0c---18103168734.pdfIn PDF document text
    • http://footstepfloor.com/upfiles/files/67175656515.pdfIn PDF document text
    • https://ylwlgwadmin.ylwl.cn/upload/files/dogerajimufudik.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/62f88f3da8c7b38daebd3d14ea6e2c67/kugadibikibukusewi.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/81g65rjfrcmbo2mfjpf4tsr6ah/duwifitukufaruto.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/7310998911.pdfIn PDF document text
    • https://grupo-kayros.com/userfiles/file/86866347720.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/5328051352.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=english+adverbs+of+frequency+exercises+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_off0000b920.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB920 15884 bytes
SHA-256: b49b75f8620c86f98969ff9feda97b8ca1759cafe230ffa1126eedc11604ba85
font_01_sfnt_off0000e0ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f8e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E1 11452 bytes
SHA-256: b248bfe70ae16fa3ba52fd248687976572876aa43b4308d72ac6859b5afcb44b

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