Malicious PDF — malware analysis report

Static analysis result for SHA-256 5de196bc47e96be0…

MALICIOUS

PDF

84.3 KB Created: 2021-09-02 08:55:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c3236222f1809e35c2830217b1123805 SHA-1: 4d315d3db37b849be92a9646ee639493f86497da SHA-256: 5de196bc47e96be0a72fcf9eacb470840ca212bb8758d2c960db8e4aaf9c2f83
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or other disposable hosting, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest this PDF is malicious, likely serving as a phishing lure or a distribution point for further malware. No scripts were extracted, and the document body was unreadable, so the analysis relies on the URL heuristics and malware detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://huntic.ru/uplcv?utm_term=jd+salinger+uncle+wiggily+in+connecticut PDF link annotation
    • https://summit-christian-academy.net/scauserfiles/files/jofijobek.pdfIn PDF document text
    • http://boschvietnam.com/files/usersfiles/files/borugofugixigobus.pdfIn PDF document text
    • https://k-newsletter.com/ckupload/files/99084614779.pdfIn PDF document text
    • https://justbuymeds.net/userfiles/file/45851805676.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/18804664338.pdfIn PDF document text
    • https://vibanghanoi.com/uploads/files/33456181398.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160ce8f189b6f1---78168720608.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16072b56499cd1---xorovaraba.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609d6414b8ed7---88279884865.pdfIn PDF document text
    • http://samtekelektrik.com/files/daxuritilidipam.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/7gn48psoooh7sgc7nd5lo1qnq5/23593318876.pdfIn PDF document text
    • http://wowbond.com/upload/Fckeditor/file/safekixegeniremowobevep.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160864cbc9783d---27180124171.pdfIn PDF document text
    • http://tvtamminhphat.com/uploads/userfiles/file/lexuzawonujomugafum.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/18159e92149f8d344bd1ac6edda7067d/99139350135.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cea7deff12---19725327674.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b3ea863823d---18721664635.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/6918787523.pdfIn PDF document text
    • https://immobilgold.com/file/letenep.pdfIn PDF document text
    • http://szsahsh.com/uploads/files/82289208099.pdfIn PDF document text
    • http://akgikorea.com/file_upload/fck_upfile/file/nisenepibowejinifejop.pdfIn PDF document text
    • http://crmrealty360degree.in/userfiles/file/penupalumetawurasarelo.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_off0000dffb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFFB 19276 bytes
SHA-256: ee83c2a6dd7b0582d25e80585bf3c90704b93157b1b4f247ef210935dc6b9d08
font_01_sfnt_off00011221.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11221 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A38 10836 bytes
SHA-256: b0f00cda609efa3693c1ffea361d071033a07416787a5cf8cb8f29887f42be00