Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a535a1dca05677f…

MALICIOUS

PDF

90.2 KB Created: 2021-07-26 18:17:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2675ad87764da349ab8ce82f47d73655 SHA-1: da47c42cc88c2ca0725e3ac7961b819bd0fb1779 SHA-256: 3a535a1dca05677f5b63211b43c6d529fcfaccbb63ae36b1bfcf2c4db6a61bbf
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload directories and other disposable hosting sites, likely to serve malicious content. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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
  • 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 http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e145c9383cf---7154876791.pdf In PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/4cc47b189424d88d1e28a0d84bc67760/falixiripup.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/redafuzizijufevesefo.pdfIn PDF document text
    • http://bettaletroom.com/file_media/file_image/file/podejonolarivamumuvipud.pdfIn PDF document text
    • https://xn--faade-mtal-p6a3a.ch/ckfinder/userfiles/files/bipirufoda.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160dbc13a05f01---xipuvaled.pdfIn PDF document text
    • http://omni-links.com/images/blog//file/39523760128.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/74a5c00d8e79ba07857068152244f8a2/15077941586.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d827be4907---remiwilufal.pdfIn PDF document text
    • http://babyschultz.com/clients/72285/File/lepuzegegulipabijalupif.pdfIn PDF document text
    • http://tantex.org/tantex/tantexuserfiles/file/kifomozubowilowofature.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096012f02571---dadipolaxejepo.pdfIn PDF document text
    • https://espaciocultivarte.com/ckfinder/userfiles/files/21938094693.pdfIn PDF document text
    • http://vervesimuhub.com/userfiles/file/69218346146.pdfIn PDF document text
    • https://scalping.ir/data/files/file/zinepofakibipigojukenel.pdfIn PDF document text
    • http://zonwering-belgie.eu/ckfinder/userfiles/files/pezujozoliwijegodikulewiv.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/16083203e6856f---98666963631.pdfIn PDF document text
    • https://noblacklist.pro/web/img/podborky/files/59793111400.pdfIn PDF document text
    • https://bbgpiti.com/userfiles/files/61590806079.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/solomewupunobaduma.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/eefb34c545ca64f0a4d5eea1a5fabd3b/60455932365.pdfIn PDF document text
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/2ehjh8cdq813va6s2r36lm2qvd/gixuzoretave.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/6521907001.pdfIn PDF document text
    • http://soundreaming.org/wp-content/plugins/super-forms/uploads/php/files/a94d9cff552e5c57fa7a4da93c2eaab0/pagovopenopevuk.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607247f545c49---9908052467.pdfIn PDF document text
    • https://www.mds-horizons.com/upload/files/mabegetaxolerokolumus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=pacific+rim+game+for+pc+-+free+download+%28pc+gameplay%29PDF 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_off0000fc2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011444.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11444 11088 bytes
SHA-256: 257d3b0b01c00d140e99ee2683af963de25958536e9c03ee2ee66b81badc754c
font_02_sfnt_off00012e17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E17 17048 bytes
SHA-256: 7afa422bb7d301ed1ea061ee2180cfd268dbf59360c99e3d06770502454317e4