Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5b88a108b66570d…

MALICIOUS

PDF

103.7 KB Created: 2021-07-03 09:14:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 1f825eb2534e4e3a804278c3a998946c SHA-1: e4b5c92d19e0aa10c03e1d02dd8b72da31dad8ce SHA-256: f5b88a108b66570d4a0f87f0c16c8b38840c5e045aca9931cb10c93eae1a1c96
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing attempt impersonating Facebook. The document contains numerous links, many pointing to compromised CMS uploads and disposable hosting, designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and link farm indicate an attempt to trick users into clicking a link, likely for credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=active+first+aid+workbook+answers.
  • 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://inlygiaylynhua.com/upload/files/tavidijizumemamoliwedujaj.pdf In PDF document text
    • http://ligonfamilyreunion.org/clients/9/9a/9a44987365eba454cd9b2deda39aa7c0/File/65362259005.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c99aac79d92---sakijobisip.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608da90fd0a5a---15998424501.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4bc05e2e7d---75545228993.pdfIn PDF document text
    • http://oticonshop.com/ckfinder/userfiles/files/befagodiro.pdfIn PDF document text
    • https://www.letspassdriving.co.uk/wp-content/plugins/super-forms/uploads/php/files/s1nkdr44pk21s82jtvdq1coe6q/51031331326.pdfIn PDF document text
    • http://montpellier-business-plan.eu/mbp/upload/images/images/upload/ckfinder/66793385069.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/2293984967.pdfIn PDF document text
    • http://clasesholandes.com/userfiles/file/6547000437.pdfIn PDF document text
    • http://carlaschroyen.com/content_docs/potedixit.pdfIn PDF document text
    • http://mankatomnclassof71.com/clients/e/e0/e0e8961458839910853a12af65841b27/File/nadawesebiwe.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/fimibe.pdfIn PDF document text
    • http://mdc.ir/ckfinder/userfiles/files/4903023190.pdfIn PDF document text
    • http://roocenter.ru/upload/file/36675454217.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/bq2ft6ml29bpbsb9fnb6684gl4/filalafarak.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/lafavunimelog.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160909a7542735---63571493814.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b79fec8e95---xurexufene.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ac367bb3cfe---zazunizakarakunave.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608759bd44850---95827492407.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d5f6368e1b2---dadavanuzokojinagitur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=active+first+aid+workbook+answersPDF 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_off00012fa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FA2 10788 bytes
SHA-256: b1bf1ad66fbc9d79330efa5dc982383d60b6e99200c50bdc1c7ebb49d75b8901
font_01_sfnt_off000148c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148C3 17952 bytes
SHA-256: dea77f0e7c61d2c2adf2a6fb20d1eb50a3009432ef2d19f7e66ec7d0b7d4acf2
font_02_sfnt_off000177ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x177FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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