Malicious PDF — malware analysis report

Static analysis result for SHA-256 caee4f945bea44b6…

MALICIOUS

PDF

77.5 KB Created: 2021-09-17 11:22:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b7482b980dbae117fefeba39f9f0f73f SHA-1: 2bdd4c8d7fa6bf649d36a3af15811dbb3e1c62b9 SHA-256: caee4f945bea44b650c031e157631fc38af685c4481f3052163df12c10f6ddfa
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm or redirection scheme. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards the exploitation of PDF vulnerabilities or social engineering to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://smidgel.ru/uplcv?utm_term=da+one+that+ghost+away+full+movie+123movies PDF link annotation
    • http://challendor.com/fckeditor/upload/file/bilulepifirub.pdfIn PDF document text
    • http://abwrosedale.com/uploads/files/76943344008.pdfIn PDF document text
    • https://stthomasorthodoxchurchsouthpampady.com/userfiles/file/towuvubojewujujo.pdfIn PDF document text
    • https://simbhaolipower.com/images/file/geviz.pdfIn PDF document text
    • http://dambi.pl/userfiles/file/91915889312.pdfIn PDF document text
    • https://santaclara.com/wysiwygfiles/file/nusokogudivinaxesadubelef.pdfIn PDF document text
    • https://bbox.ru/images/shared/file/boranab.pdfIn PDF document text
    • https://poulinstrapscan.com/userfiles/file/numajivokuli.pdfIn PDF document text
    • http://fjzy18.com/image/uload/files/xusipuluwaxorivisas.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fccdf6369e---vakax.pdfIn PDF document text
    • http://okna-kursk.ru/page_edit/_samples/userfiles/files/kesikopuzodaj.pdfIn PDF document text
    • https://gulfb2b.com/userfiles/file/xafuvumetasumavagizedewa.pdfIn PDF document text
    • http://biondiairsystem.it/userfiles/files/32111990388.pdfIn PDF document text
    • https://pinkrali.com/calisma2/files/uploads/70562323054.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/12557123794.pdfIn PDF document text
    • http://webinaris.biz/ckfinder/userfiles/publics/files/fikaxebox.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135a8d966633---47908230283.pdfIn PDF document text
    • http://artin-intranet.com/ckupload/files/joludukosuzexubozag.pdfIn PDF document text
    • http://neurooperations.com/ckfinder/userfiles/files/lujarevedugamaradap.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613545e837f39---pivafotodamimudomapolor.pdfIn PDF document text
    • https://drddvichitra.com/userfiles/file/lutuge.pdfIn PDF document text
    • http://yummyschool.com/_UploadFile/Images/file/nulututonilo.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_off0000c545.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC545 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD57 18704 bytes
SHA-256: 0786ed3c8e1d6f16c83b1bfb4e6493650c0e61a39eb7c8c62fb7cdd90895c83c
font_02_sfnt_off00010dfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DFB 11272 bytes
SHA-256: cbd6021870e2e382bad9c613048dddf715da4eec1470e1d3e76e7566601070c3

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