Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbed1931f578f670…

MALICIOUS

PDF

69.4 KB Created: 2021-09-27 07:52:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: da0b0efa75b6014d1f52eb0148bf8acc SHA-1: 25ec6b685f8eb9de01fb74b58a07e99a1c6fa3d7 SHA-256: dbed1931f578f6706261187996ed686b29311ebd174684a4bb90c1c801b9b832
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised websites or disposable hosting, indicative of a link farm used for phishing or malware distribution. The 'PDF_IMAGE_LURE' heuristic suggests it's an image-based document designed to trick users into clicking. ClamAV detection and ML classification further support its malicious nature. No scripts were extracted, but the presence of external links implies an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • 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 https://irlanc.ru/uplcv?utm_term=get+iphone+emojis+on+android PDF link annotation
    • http://benthanhsgfarm.net/images/uploads/files/zunebabaxijavov.pdfIn PDF document text
    • https://ceramicasvillaflor.cl/UserFiles/File/fovisafogegapix.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/lokijevut.pdfIn PDF document text
    • http://architettobotteonpierpaolostudioabacus.it/userfiles/files/fogovonalujekogagofelafe.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1614d9344d85df---xavobiwuzizu.pdfIn PDF document text
    • https://curvy.tw/upload/files/24557141766.pdfIn PDF document text
    • https://ph2020.org/FCKeditor/file/25763007029.pdfIn PDF document text
    • http://hkxhjfc.ltd/uploads/files/20210924105823.pdfIn PDF document text
    • https://mekongtransport.com/upload/userfiles/files/diduxepo.pdfIn PDF document text
    • http://80tner.friend-match.com/upload/files/43423149135.pdfIn PDF document text
    • https://tutorlookup.com/ckeditor/ckfinder/userfiles/files/sapasipatipupupesaxuw.pdfIn PDF document text
    • http://marketingnews.fr/images/file/masutujel.pdfIn PDF document text
    • http://kdbelektrotechniek.nl/uploads/file/1656764959.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///murol.pdfIn PDF document text
    • http://araonline.hu/uploads/file/85412034457.pdfIn PDF document text
    • http://oshcongregation.com/userfiles/file/95452755234.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/98238e96cf40d14d9a30ae9d3fe34286/11427304812.pdfIn PDF document text
    • http://gamax-moto.cz/data/dokumenty/57573607039.pdfIn PDF document text
    • https://zahidnawaz.com/UploadedImages/image/23727905390.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613f03db5e367---zuxuta.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/4e4bb9d3e5a5ad9a4608e93dd7d373cc/xolodaxuxedukajuw.pdfIn PDF document text
    • http://dooroc.com/tk/upload/file/wutadikinejibiziw.pdfIn PDF document text
    • http://kondicionery-shodnya.ru/upload_picture/file/vopexugaratodigazab.pdfIn PDF document text
    • http://sheilahancock.net/blogfck/file/64362766896.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_off0000b39f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB39F 14216 bytes
SHA-256: 6bcf96f341b5523e64350384b686071d32aca12e017b861923c35e2cec07e249
font_01_sfnt_off0000d717.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD717 10780 bytes
SHA-256: 4af26486b2ab111989b9332505893f4fe3ba881e03a307347cec98d6fa2c5c14
font_02_sfnt_off0000efb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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