Malicious PDF — malware analysis report

Static analysis result for SHA-256 f58808e2ca7598eb…

MALICIOUS

PDF

69.6 KB Created: 2021-09-28 14:00:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 704cc4a42778008d77a0ef0fa0f4ab05 SHA-1: 89a0290685e0244a4ca4a305de533dd46f32858c SHA-256: f58808e2ca7598ebfaa7f29ad89f1dd46178e13c20ae1eab9fc42581924d0124
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains numerous links pointing to potentially compromised WordPress uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. While no scripts were directly extracted, the PDF structure and heuristic firings indicate it's designed to trick users into clicking external links, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://www.anglometais.com.br/adm/Editor/ckfinder/userfiles/files/kulujudubez.pdf In PDF document text
    • https://thietkewebseo.com/webroot/img/files/14648172482.pdfIn PDF document text
    • https://newsale.linyn.mobi/upload/ckeditor/pages/files/tifedimovotujusufege.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/27f37fc92987b756cc3311f59800bb81/46694095135.pdfIn PDF document text
    • http://security-m.jp/tool/images/file/9123919560.pdfIn PDF document text
    • https://dursunguney.com/userfiles/files/25617011269.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/48384684621.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/96288fbf952164bfafb18a458c02872d/81126193407.pdfIn PDF document text
    • http://sonarkella.com/userfiles/file/jifipafazurotibirab.pdfIn PDF document text
    • https://maintogelonline2.bet/contents/files/sabinotutini.pdfIn PDF document text
    • http://goldmustang.ru/files/files/66581117091.pdfIn PDF document text
    • https://girl0229960192.com/upload/users/files/bepovadebikovigizudodoj.pdfIn PDF document text
    • http://ulrike-mayer.de/userfiles/files/maritemiruzegajoti.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/51614092823.pdfIn PDF document text
    • http://nage-z.com/ckfinder/userfiles/files/mexuwodapabosa.pdfIn PDF document text
    • http://puginternational.com/ckfinder/userfiles/files/98351867015.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/8521316368.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f5a27caeb9---2008598362.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/886322c28699661f7be2c909e69da2eb/32104992144.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/44d3f846ca95bf595152f342643b9290/jaguzogajarizonimufudo.pdfIn PDF document text
    • https://malinaionescu.ro/userfiles/file/gepuxopa.pdfIn PDF document text
    • http://www.hkrns.org.hk/ckfinder/userfiles/files/nepud.pdfIn PDF document text
    • https://iveducentar.com/uploads/assets/file/pasog.pdfIn PDF document text
    • http://www.golfusa.be/userfiles/files/86475448269.pdfIn PDF document text
    • http://candientushinko.com/images/file/39080830501.pdfIn PDF document text
    • https://allianztc.ro/files/file/zerazofibaduselemeturovo.pdfIn PDF document text
    • http://kaizenlife.com/ckfinder/userfiles/files/85529132838.pdfIn PDF document text
    • http://kurskodkb.ru/page_edit/_samples/userfiles/files/dapejejoposimegir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=tamil+study+bible+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_off0000b5dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cdf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDF4 10652 bytes
SHA-256: dab1aa4197e327de3029b05677a0ba3fa78aa95ce9b34ddf23200a708ac9068e
font_02_sfnt_off0000e628.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE628 14120 bytes
SHA-256: 190c0b8c2a2a0c3ec23a6257d65a924c8155b9afee19ed82ca75ea7f6238bd30