Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ca85ef303e4b08a…

MALICIOUS

PDF

88.0 KB Created: 2021-09-21 01:57:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 14d867abe51fed2f5a636b8f32afbee3 SHA-1: b09d71ffd854d217c267c3f455c7b2559bd47d23 SHA-256: 4ca85ef303e4b08a1cfc7bf79e0f22d025f1e437a3f882a6b423135136b5d028
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicate a deliberate attempt to create a link farm for malicious purposes. The embedded JavaScript likely facilitates the redirection to these malicious sites, potentially for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://queure.ru/uplcv?utm_term=how+to+get+50+v+bucks+in+save+the+world PDF link annotation
    • http://rszm88.com/upfolder/e/files/20210901212532.pdfIn PDF document text
    • https://hgb.se/filer/file/40728277742.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139caa14f12e---vulakav.pdfIn PDF document text
    • http://velocimapper.com/webfiles/file/fitagajix.pdfIn PDF document text
    • https://www.rongoldmanlaw.com/system/js/back/ckfinder/userfiles/files/15599773491.pdfIn PDF document text
    • http://anm-av.de/uploads/files/nogonadevopodavujonabu.pdfIn PDF document text
    • https://hkki.org/userfiles/files/6698921892.pdfIn PDF document text
    • https://rlmahtani.com/userfiles/files/gugazavuga.pdfIn PDF document text
    • http://salamino.pl/userfiles/file/bufojepefavobilebiju.pdfIn PDF document text
    • http://studioferrato.it/userfiles/files/zisavavukakifukiru.pdfIn PDF document text
    • https://uetty.xyz/js/ckfinder/userfiles/files/sedevanadiku.pdfIn PDF document text
    • http://17njl.com/userfiles/files/84229813463.pdfIn PDF document text
    • https://tierrettung-in-katalonien.org/ckfinder/userfiles/files/tikuxujejezi.pdfIn PDF document text
    • http://labmansour.com/app/webroot/js/ckfinder/userfiles/files/80346623278.pdfIn PDF document text
    • https://galaxytraining.examinationonline.com/files/54900854564.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/161328bb36534f---68970429583.pdfIn PDF document text
    • http://www.heatandgas.com/EditorImages/file/zugosarasiwikusomaguvese.pdfIn PDF document text
    • http://geotersrl.it/file/98199510903.pdfIn PDF document text
    • http://eschool365.in/js/admin/uploadfiles/file/panabufalurag.pdfIn PDF document text
    • https://xpress2.eu/ckfinder/userfiles/files/22992462573.pdfIn PDF document text
    • http://dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/92270829106.pdfIn PDF document text
    • http://safiorida.nl/operatori/userfiles/file/91719364347.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/vf02t1gcfcssno8u0spfifotnp/56740634986.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_off0000ec43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC43 19524 bytes
SHA-256: 7df86ba8a7535e0e2c61c232867086350e1a8b7eb0b793958b445962e9ea74d0
font_01_sfnt_off00011f83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001379a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1379A 11380 bytes
SHA-256: 422efde891a3c3736e78d194e3a5eb0d62826fd3e3107568060a59d7e65ef206

Open this report in the interactive analyzer, or submit your own file for analysis.