Malicious PDF — malware analysis report

Static analysis result for SHA-256 13bd9bf3e74f9f4d…

MALICIOUS

PDF

72.0 KB Created: 2021-09-21 06:06:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a66dcb5ec9c40227a383cff00035b5e4 SHA-1: c1e08fafbbcb6eb4926798f073612030919df411 SHA-256: 13bd9bf3e74f9f4df44d83ff5823b5de7d02be9f9e70505e9878559ade93139a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many pointing to compromised websites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware download sites. The embedded JavaScript is likely used to facilitate these redirects or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://nomylo.ru/uplcv?utm_term=frp+unlock+bypass+apk PDF link annotation
    • http://xfswchem.com/upload/files/58407905557.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/3f0eb935e3eeec1ee5f9f4875517e6df/14399822979.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16148791693c1a---korasutanebur.pdfIn PDF document text
    • http://fivelscope.net/fckimages/karuwutarepowep.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/s67bcn80mkqgh3klukcnrc8dkl/44540082731.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/940d5552d4d1a912e6003a86188ca385/lebagurivif.pdfIn PDF document text
    • http://romangruszecki.com/uploaded/file/76030178583.pdfIn PDF document text
    • https://www.ebenisterie-burette.com/ckfinder/userfiles/files/luveboxudipebavuwezeku.pdfIn PDF document text
    • https://coevent.ru/upload/files/31492137425.pdfIn PDF document text
    • http://keystoparadise.com/userfiles/files/26858683529.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/2715a0e6bb483ce0e6b58ec2482bdc37/dibetodaniliru.pdfIn PDF document text
    • http://xn----ctbguteehkho5h.xn--p1ai/ckfinder/userfiles/files/8959593486.pdfIn PDF document text
    • http://anpo.vn/upload/files/57083338092.pdfIn PDF document text
    • https://topupdana.com/contents/files/76552443371.pdfIn PDF document text
    • http://www.aaar.cat/assets/js/ckfinder/userfiles/files/gabifemimefifevika.pdfIn PDF document text
    • http://csc0898.com/userfiles/file/20210905131503_tgtfso.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/38849844173.pdfIn PDF document text
    • http://3q1p.com/upload/file/210901143205402626cvfu586r0d7z.pdfIn PDF document text
    • http://portalpr-b2b.es/img/user//file/_0039679001630592252.pdfIn PDF document text
    • http://sellmysayarah.com/userfiles/files/vewavudes.pdfIn PDF document text
    • http://boletos.luzservicos.com/ckfinder/userfiles/files/79407365330.pdfIn PDF document text
    • http://www.golfusa.be/userfiles/files/51518632526.pdfIn PDF document text
    • http://hexindechem.com/upload/files/51751151780.pdfIn PDF document text
    • https://tsafar.ir/basefile/tsafarir/files/73008372915.pdfIn PDF document text
    • https://www.auto-ecole-acm.com/ckfinder/userfiles/files/27734583338.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_off0000b4ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4CA 17388 bytes
SHA-256: 81e7c28c32945497fcc74111675c9cb1aae8f1d4eb3d9e783e8bcc1d5f5ad3fb
font_01_sfnt_off0000e132.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE132 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f949.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF949 10468 bytes
SHA-256: f0676ae0dde149c1bfa6eb494c70690169d56f634398da86f5d8cac7b4276df7

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