Malicious PDF — malware analysis report

Static analysis result for SHA-256 080bf09133cb8838…

MALICIOUS

PDF

107.5 KB Created: 2021-08-20 15:08:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 62611cf5fd74f74f58587c8d99c90069 SHA-1: d7538c589421fbf22a25fd4174d21fc5885be2bc SHA-256: 080bf09133cb8838ea78e2f0761c5e44d0532b202e5ae0537a2efeec1cfedd51
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1190 Exploit Public-Facing Application

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links to external sites, many of which appear to be compromised WordPress installations used for hosting PDF files. The presence of a 'Fake CAPTCHA' heuristic suggests the document aims to deceive the user into performing an action, likely to download or execute a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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://laborke.ru/uplcv?utm_term=el+auto+increible+serie+completa+espa%C3%B1ol+latino+1982 PDF link annotation
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc00fdccf8---92536226924.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/fgl5e8oaa10ej2oe7m2jbilru4/41301326315.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cac5f8357da---92820988011.pdfIn PDF document text
    • http://minhledtran.com/luutru/files/27457174497.pdfIn PDF document text
    • http://zge-led.com/luodan/images/userfiles/file/fovezobunowudasexifo.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/as95s501f0t296q165t6buelr8/15547973060.pdfIn PDF document text
    • https://cobrawire.com/userfiles/files/vanemenuxofifilerepixenum.pdfIn PDF document text
    • https://rivaflo-south.in/userfiles/files/60089522563.pdfIn PDF document text
    • http://xn--b1akwe.xn--p1ai/userfiles/file/dunuxugiwofuzowagevanes.pdfIn PDF document text
    • http://ahchala.com/img/file/58955838192.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/dfd8d0ac5r11ol3lp8sg8l11j5/51519676549.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/fdskp7rambd0np5a84fdko5pot/28217759240.pdfIn PDF document text
    • http://gintaras.cz/userfiles/file/10070080671.pdfIn PDF document text
    • http://diplomat2014.ru/ckfinder/userfiles/files/vadapubez.pdfIn PDF document text
    • http://applexin.com/ttpsea/files/file/80624797413.pdfIn PDF document text
    • http://wonsakai.com/uploads/files/12933925795.pdfIn PDF document text
    • https://suprizpin.com/calisma2/files/uploads/14371063496.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/visaxaxiwalibabidenun.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/318e36ecc92eec19851aeb86ed46144a/remulipixogajajopiwel.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/682943f57ea62df376375562685eb484/59928650358.pdfIn PDF document text
    • http://www.koeru.eu/failid/file/kazoxubanijiga.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba74095c45d---30169139867.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a062726abaf---nosonelowotadevalasu.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_off00013639.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13639 19764 bytes
SHA-256: 66e5b9b4445b5f8cecaba77750c4967b3b1de9c962a866e2b513b433605df7e6
font_01_sfnt_off0001692e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1692E 11512 bytes
SHA-256: 5dda1eb8d1dd1b1642f47be895cc748d041b738bce7e4e2582ab43d73a72dfde
font_02_sfnt_off00018411.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18411 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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