Malicious PDF — malware analysis report

Static analysis result for SHA-256 8832cb853954959c…

MALICIOUS

PDF

77.2 KB Created: 2021-09-22 14:32:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: bc7b393fd4a78c99422db15178e619ca SHA-1: c6e2c283bd9479e604ad47750fae379809e53109 SHA-256: 8832cb853954959cc10b996468fdf2f6064a789c434ea601c99c99b2171729c8
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or malware distribution attempt. It functions as a link farm, with numerous URLs pointing to various websites, including those hosted on compromised CMS platforms. The presence of 'utm_term' parameters in some URLs suggests an attempt to track user engagement, common in phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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 https://irlanc.ru/uplcv?utm_term=hd+live+cricket+tv+app+download PDF link annotation
    • https://unovosti.tv/ckfinder/userfiles/files/pobovadowusomi.pdfIn PDF document text
    • https://bgg.pirkitpadangas.lt/ckfinder/userfiles/files/belulap.pdfIn PDF document text
    • http://sportsbettingconsultants.net/cote_dor_import/admin/ckfinder/userfiles/files/86142104263.pdfIn PDF document text
    • https://afmiletisim.com/resimler/files/13292601927.pdfIn PDF document text
    • http://fotocaroli.it/userfiles/files/75478278606.pdfIn PDF document text
    • http://dezmaster.com/userfiles/file/65574493200.pdfIn PDF document text
    • http://tatishev.ru/admin/ckfinder/userfiles/files/97908202340.pdfIn PDF document text
    • https://detmers-kontejner.hr/files/37929233209.pdfIn PDF document text
    • http://allefrgycg.news-read.com/upload/files/tuvovimu.pdfIn PDF document text
    • http://www.klimavill.com/data/editorfile/76721264217.pdfIn PDF document text
    • http://chiangmai-clean.com/user_img/files/levozobut.pdfIn PDF document text
    • https://emmaushuis.org/pages/jasowedavojeni.pdfIn PDF document text
    • http://cl-metalparts.com/d/files/toteganixipovupile.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/8292611047.pdfIn PDF document text
    • http://nhasachconggiao.com/luutru/files/76670632583.pdfIn PDF document text
    • http://primaneighbors.com/userimages/56374737825.pdfIn PDF document text
    • http://epoxidice.ro/mm/file/42957880794.pdfIn PDF document text
    • http://levakov132.ru/userfiles/file/xemumolamozavevidit.pdfIn PDF document text
    • http://agierresrl.it/userfiles/files/7174899941.pdfIn PDF document text
    • https://ferropula.hr/files/91551174279.pdfIn PDF document text
    • http://dpnovelty.com/upload/files/4869003259.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/3ab9c6f47f0028383628888451193ad6/vogogumixe.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16134e3727fc8e---33742160145.pdfIn PDF document text
    • http://jun-travel.com/userfiles/file/18003592725.pdfIn PDF document text
    • http://studiobaldizzone.com/userfiles/files/7211528306.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/69840285902.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/8fd84nreb9s91u9elo0ian99h1/gonekexaxefuwebidirim.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_off0000c961.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC961 17544 bytes
SHA-256: 2d357172b3b14117030ef4b1dcbb378d273e7281d31c2563c9e91fec3ebf3816
font_01_sfnt_off0000f6c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ede.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EDE 10572 bytes
SHA-256: 67e75af91b54cce535934ed0656dd3e4d7293dbc3b36e2f92100fbfc74ed1372