Malicious PDF — malware analysis report

Static analysis result for SHA-256 0728247e0dc3433c…

MALICIOUS

PDF

87.0 KB Created: 2021-07-02 07:11:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 73fad70d20426f443f54798c9471d3b8 SHA-1: e0b72689cf7fdbd7e5d648eb1be24b182a231c64 SHA-256: 0728247e0dc3433c3de86d9e8dab8b87eb511e39cc2a5ee5e40d7ce1e6408785
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The document contains numerous links to compromised websites, suggesting it is part of a link farm designed to redirect users to malicious content or downloads. The presence of a 'download button' heuristic further supports the phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://smidgel.ru/uplcv?utm_term=extract+embedded+subtitles+from+mkv PDF link annotation
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/b946f271e9f612d995e29cc2c4641c09/pulobujuxusomigipa.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c18ba541d53---gopaxejarilimupisibezib.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/77906404138.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/b0skho1lju5johiqrsb58qfr30/55329216317.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160813e5463c7f---26408532406.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/4c2952c53cfe5cccde728ef71ad5d44d/26896984102.pdfIn PDF document text
    • http://ledson.ru/upload_picture/gotuwugafobofejogekosa.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afe4e30e283---30427070486.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095c9bee29ae---dukojekov.pdfIn PDF document text
    • https://hpsoft.shop/upload/files/xinepewusubo.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/820fa4adc805115c89cdec2c0070ba65/dukujikekuwemazo.pdfIn PDF document text
    • http://saharun.org/uploads/ckfinder/userfiles/files/kokedawudokili.pdfIn PDF document text
    • https://burkina-businessschool.com/business_school/uploads/file/98638601197.pdfIn PDF document text
    • http://dnepropress.net/files/file/ruxebilexuwu.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/wovib.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/fijuvuratosofagov.pdfIn PDF document text
    • https://kltccompany.com/ckfinder/userfiles/files/wipikosoluvabufes.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b23dd709428---65820525424.pdfIn PDF document text
    • http://sheeld.org/clients/d/d0/d021426cee8527c21a172be12ef3d645/File/dajurimuwemolibibadewine.pdfIn PDF document text
    • http://biometria.pl/photos_fck/file/77092795664.pdfIn PDF document text
    • http://nfrostov.ru/upload/files/goxuxadajilupakajog.pdfIn PDF document text
    • https://conexus-study-abroad-travel.com/ckfinder/userfiles/file/zokufejujavazujedusup.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/66718677795.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/5dc00394cf334a0b128790a4e246b2ea/zariwomomebifirifawolali.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/8f5039d4180a69434cae4a363dfc1dae/7755622144.pdfIn PDF document text
    • http://xn--dlek-5qa.com/admin/UserFiles/file/tufixavapebixipi.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_off0000ebce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBCE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000103e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E5 11016 bytes
SHA-256: 10860b2962f2db29ce7e2c22621a55409d408a8269609b14df0c1549f6354ddb
font_02_sfnt_off00011d98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D98 18000 bytes
SHA-256: bd46225612fa9e3e3e6d500f5a98a2bd906062d94775f91afaa45cbe068cb105