Malicious PDF — malware analysis report

Static analysis result for SHA-256 11c9dc834ecb0cd5…

MALICIOUS

PDF

81.0 KB Created: 2021-08-28 15:22:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 8e997b576cfe433a392fb523a43efa58 SHA-1: ccb6306530ffdb6419d7953f2cac1d730629cb47 SHA-256: 11c9dc834ecb0cd5c928615f2c7d045dc57329f779f24646a5aca24036a08d73
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • 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.
  • 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://rebizplus.com/userfiles/file/72074637348.pdf In PDF document text
    • https://tsegypt.com/file/14691561815.pdfIn PDF document text
    • http://uelzecht.lu/userfiles/files/44146233670.pdfIn PDF document text
    • http://sheeld.org/clients/d/d0/d021426cee8527c21a172be12ef3d645/File/86757390515.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbe226e74c2---69041194824.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/d02edbv8v5eb1gs4lsij7m7u46/8168594796.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a38d751a724---gogewidoze.pdfIn PDF document text
    • http://officinedesign.it/userfiles/files/vijitewiwurezogopazer.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1606e9b0939008---13793930539.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210628095404.pdfIn PDF document text
    • https://cornerstonelaw.eu/userfiles//file/radarezobejetabuxubelopo.pdfIn PDF document text
    • https://greenvalleykerala.com/ckfinder/userfiles/files/97333408124.pdfIn PDF document text
    • https://oykufestivali.com/ckfinder/userfiles/files/tozunaferoderowuwidugada.pdfIn PDF document text
    • http://alwaysfavorentertainment.com/clients/879371/File/44597186334.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1610bac96867e9---maxizizinuvodowuvoju.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/fnt7325eb3g001tks5u9nop1ef/25058865873.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/3891d3eae826d4fcbfe6e3f0ef2a7c5b/7982436258.pdfIn PDF document text
    • https://skinrepublic.vn/webroot/img/files/rujuwovidesiva.pdfIn PDF document text
    • http://podlahyadvere.sk/editor_uploads/system/files/90543094331.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a3eebe90b5d---pasubatevigupetatowozon.pdfIn PDF document text
    • http://asirakademi.com/resimler/files/muguvug.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/bimilulatiwejisanofulazo.pdfIn PDF document text
    • https://binarbaid.com/public_html/userfiles/file/vudagakefapemabudusal.pdfIn PDF document text
    • http://pogservice.ru/userfiles/file/kijifiduboxowow.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/ql7sc94b3horffpit6vodomlle/34517926290.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/a0c4e1308a0cc13a3ed278e4830b8825/jobuxuzelonunavafeted.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=black+shoes+songPDF 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_off0000d5b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD0 10364 bytes
SHA-256: 5d7bac3d00c61c0525c0d7c7ec507181e7244e0f5391350205b4d2cae340f9f5
font_02_sfnt_off00010539.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10539 18420 bytes
SHA-256: d39555c45bfc2e07b4894d6b2598a98cf3a754f818157eca72e07be7bde3f149