Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea51b03eca1d36b1…

MALICIOUS

PDF

77.3 KB Created: 2021-09-23 09:32:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 05316e196d87277a16108ddad3577693 SHA-1: ea7ec4d51556dd0bdd574d6c09ded97e1b976ab1 SHA-256: ea51b03eca1d36b17777355123abefc31310f600f02cf55d3412e655dffd6559
204 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external links, some hosted on compromised WordPress sites. The 'Fake CAPTCHA' heuristic indicates the document's primary goal is to deceive the user into executing further actions, likely to download and run a malicious payload. The presence of JavaScript suggests an attempt to exploit browser vulnerabilities or execute malicious code.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://zeminyerkaplama.com/upload/ckfinder/files/betavapagiriwalifemod.pdf In PDF document text
    • https://ngoctraithaibinhduong.com/uploads/news_file/76982183222.pdfIn PDF document text
    • https://johanbjerke.se/userfiles/file/98888607802.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/cea387d0d9828ed2ef63eb2d085258f4/70140499351.pdfIn PDF document text
    • https://dalilak1.com/userfiles/file/nufawanelulobo.pdfIn PDF document text
    • http://ristoranteyuri2.com/userfiles/file/wadifujixivobefoguda.pdfIn PDF document text
    • http://banglenhospital.com/UserFiles/File/zekurisuduxa.pdfIn PDF document text
    • http://technestudio.eu/userfiles/files/45939822496.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/i25hu0endlf9kujne0f9qbg9j0/20498319276.pdfIn PDF document text
    • https://ta-taiwan.com/app/webroot/userfiles/files/xenexuxupexif.pdfIn PDF document text
    • http://jatechkj.pl/upload/fck/file/46060292220.pdfIn PDF document text
    • https://memorybg.net/app/templates/js/ckfinder/userfiles/files/zaxedusababifipopasen.pdfIn PDF document text
    • http://topp.pl/_topp/file/38792610088.pdfIn PDF document text
    • http://gurgaontaxi.com/pa/trainstation/uploads/image/file/70575639562.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16141566f80907---4922588828.pdfIn PDF document text
    • https://ourlady-schools2.com/userfiles/files/simiximoxumi.pdfIn PDF document text
    • http://qualityspices.in/ckuploads/files/92608276444.pdfIn PDF document text
    • http://technology-mp.it/userfiles/files/garamojosemarusakurofifef.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149919b66abc---gafeti.pdfIn PDF document text
    • http://tdsns.ru/userfiles/file/29625458102.pdfIn PDF document text
    • http://naso10.com/userData/board/file/pademogamunodajub.pdfIn PDF document text
    • http://otoozevran.com/resimler/files/22822026367.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/sunukitojijuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=pikachu+mod+apkPDF 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_off0000cba0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBA0 17584 bytes
SHA-256: 9dcf7f475f107d131d69fcca9eb174a7eccc14a444dabe326feb81cf7f1b5631
font_01_sfnt_off0000f8cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8CD 10324 bytes
SHA-256: 30285d98a04d04d41eb780e4946157cc659e9b4c301edb65580a63402097fdd3
font_02_sfnt_off00011008.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11008 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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