Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbf3920ebb4dc1a5…

MALICIOUS

PDF

69.5 KB Created: 2021-09-18 01:36:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: f7fc803f7082d7477e7c008c79433bb2 SHA-1: 86588f064eeb26f497f017e79e6f14b87b8cae84 SHA-256: bbf3920ebb4dc1a550eebf2333e7f62493a54c7b275a4e49cfa474deb07cc2b2
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document employs a common phishing lure, presenting itself as an image to entice user interaction. It contains embedded JavaScript and a multitude of links pointing to compromised websites, suggesting an attempt to download and execute a secondary malicious payload. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. 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 http://fundacjaproartis.pl/javascript/ckfinder/userfiles/files/dolewenogeruvevumuru.pdf In PDF document text
    • https://muachungbaohiem.com/uploads/userfiles/file/53181176628.pdfIn PDF document text
    • http://thuduchouse.vn/pics/file/bepozeviwev.pdfIn PDF document text
    • https://eminenceconstruction.ca/viking1/uploads/files/mexoremoxug.pdfIn PDF document text
    • http://paraglider24.de/pics/fotos/1/file/kuzega.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/zaxuruvomoxedik.pdfIn PDF document text
    • https://yesilkoyluleriz.biz/resimler/files/zitokowodifemivubes.pdfIn PDF document text
    • https://vcubusinesssolutions.com/userfiles/file/48291701309.pdfIn PDF document text
    • http://metapolar.hu/tmp/weloxak.pdfIn PDF document text
    • http://fonnepal.org/userfiles/file/vorasolakivuxipetid.pdfIn PDF document text
    • http://china-engine.net/ckfinder/userfiles/files/18776566353.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16135e790da8a1---pofuroxov.pdfIn PDF document text
    • http://naphogacomposite.com/upload/files/robekene.pdfIn PDF document text
    • https://durgabas.coop.np/ckfinder/userfiles/files/davevupajuropusaf.pdfIn PDF document text
    • https://www.akilciilacdernegi.com/ckfinder/userfiles/files/44692281047.pdfIn PDF document text
    • http://dentalcenterstudio.it/userfiles/files/wexodugoxobabirifijo.pdfIn PDF document text
    • http://g-shocktou.com/user_file/file/biguwe.pdfIn PDF document text
    • http://kondicionery-krasnogorsk.ru/upload_picture/file/viforafuwiragig.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/57693146611.pdfIn PDF document text
    • https://businessincasey.com.au/application/third_party/ckfinder/userfiles/files/30861405954.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16144b4bf2314f---fawojogitexojeterunajuxen.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/44720512799.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/613eded3b7e763898fabaf4187fc2308/wudanegajosu.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e67116110e---nuloxalavigagipis.pdfIn PDF document text
    • http://isisthailand.org/file_media/file_image/file/2317196163.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=video+to+mps+converter+freePDF 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_off0000b584.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB584 13840 bytes
SHA-256: 4619051dae67ba2576bfeaf766ff1c8c0aed6cd4c57a4ed705d688f93324284e
font_01_sfnt_off0000d7b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B3 10608 bytes
SHA-256: a7862fc9eabc2eae060cf806575476d143aacc1c1ad79a28f3f805a5d1965d13
font_02_sfnt_off0000efeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1