Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c58a4dc603695eb…

MALICIOUS

PDF

67.3 KB Created: 2021-09-18 01:20:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9f4b23bc39a9aa5dbac3e74759c111a1 SHA-1: 9f253b51381c76dd190ebfc0870b6516fbd77b41 SHA-256: 4c58a4dc603695eb1ee4bb4e2e95ed17d86fe9614e01958501c3b6ad0cb3d277
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by ClamAV and a machine learning classifier. It employs a common phishing lure technique, presenting itself as an image-only document with a clickable action to disguise malicious links. The embedded JavaScript and the numerous external URLs, many hosted on compromised CMS uploads, suggest an attempt to redirect users to malicious sites for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 67 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.
  • 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 http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134f44c43cda---nuvalipukube.pdf In PDF document text
    • http://smepil.com/ckeditor/userfiles/files/65730445114.pdfIn PDF document text
    • http://etepi.pt/js/ckfinder/userfiles/files/59631495474.pdfIn PDF document text
    • http://www.prieteniitehnicii.ro/documente/file/bowunojenuru.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161450dd31d844---22758932248.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/10120395556131aca34bb13.pdfIn PDF document text
    • http://bobiniauto.com/userfiles/file/lirogikesutumasib.pdfIn PDF document text
    • https://banderlogclub.ru/Files/file/40281605520.pdfIn PDF document text
    • http://angelascanu.it/uploads/file/zoduvupesoxoxexa.pdfIn PDF document text
    • http://cayxaotamphan.net/userfiles/image/file/befotezivuxewogefuwemezaf.pdfIn PDF document text
    • https://talaa-obour.com/webmisr/uploadwebmisr/file/21185490363.pdfIn PDF document text
    • http://locthanhwindow.com/img_duhoc/files/20126794416.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/nibuduwegukulimeki.pdfIn PDF document text
    • https://satybharat.com/ci/userfiles/files/koxoponugujipux.pdfIn PDF document text
    • http://chothuexeninhbinh.net/data/dulieu/files/guxademurozatovitofalemok.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/0a6ca244b2035784908bcb0ef8990cff/76787946972.pdfIn PDF document text
    • http://randoquad72.fr/userfiles/file/mizaxuzigikapu.pdfIn PDF document text
    • http://antropolog.ru/userfiles/file/buxivaxidale.pdfIn PDF document text
    • http://besteva.com/upload/files/39110827644.pdfIn PDF document text
    • http://hongpakthai.com/ckfinder/userfiles/files/libekuzadunem.pdfIn PDF document text
    • https://artenika.pl/fck/file/26596270063.pdfIn PDF document text
    • http://ngoinvest.com/uploads/ckfinder/files/65443376042.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=what+is+mobdro+for+smart+tvPDF 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_off0000ac77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC77 13800 bytes
SHA-256: d56a0f868397439f15142818069954ff8d76682c1952a23a91c7f9bd0f8d6731
font_01_sfnt_off0000ce89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e6a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A0 10536 bytes
SHA-256: 37c0d775db9fe751d27be93296589d3c878367e1b7d77f0e34b8f865d64a04a7

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