Malicious PDF — malware analysis report

Static analysis result for SHA-256 c68dbb9d15321324…

MALICIOUS

PDF

82.0 KB Created: 2021-09-01 10:05:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7ee357fd17134874c877ec041c3a3147 SHA-1: de5231480c94b704e48876ac376590477a67bf42 SHA-256: c68dbb9d1532132494927b57c7791c5e0fc5e404c2e1ca7296ad00a04edd9b89
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a machine learning classifier and ClamAV, identifying it as a phishing trojan. The document contains a link farm pointing to numerous URLs, many hosted on compromised websites or disposable domains, suggesting an attempt to distribute malicious content or phish users. No scripts were extracted, but the structure indicates a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

Heuristics 6

  • 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.
  • 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://joltiy.ru/uploads/files/81565131552.pdf In PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/610a496a958eee5f861804a7a030b956/wefelojozugimatuninuxe.pdfIn PDF document text
    • https://rmduncanrealty.com/userfiles/files/namobupinopej.pdfIn PDF document text
    • http://hsound.ro/images/custom/file/15766490113.pdfIn PDF document text
    • http://ucity68.com/clients/e/ea/ea220da86df44fb0ae3b7c8e8295ccc1/File/65905911918.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/b4695a7bfa00ba2e95beaaa6d1edd7c0/71526325769.pdfIn PDF document text
    • http://ansatrans.ru/admin/ckfinder/userfiles/files/merun.pdfIn PDF document text
    • http://alumcity.ru/userfiles/file/36643384673.pdfIn PDF document text
    • https://actorconseil.com/files/file/favurovituwavigojis.pdfIn PDF document text
    • http://fd-health.com/upload/ckeditor/files/tewoza.pdfIn PDF document text
    • http://studioego.cz/userfiles/file/fuvezikapajovomokeb.pdfIn PDF document text
    • https://regiefranchet.fr/userfiles/files/45241874543.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160853fbb4378b---jonedorurepigonodi.pdfIn PDF document text
    • http://www.egavilanes.com/ckfinder/userfiles/files/22764001031.pdfIn PDF document text
    • http://biotledlight.com/userfiles/file///18427272244.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/25dbd2656e8739901458bce40854a0c7/23797314415.pdfIn PDF document text
    • http://fantalife.nl/userfiles/file/40035869827.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/t53966ovsjt6tbbnb34023logj/59607672690.pdfIn PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/95815275363.pdfIn PDF document text
    • http://tw-sincere.com/upfiles/editor/files/32256686561.pdfIn PDF document text
    • https://barcelonacentromedico.es/files/galeria/files/bilidaginarodapi.pdfIn PDF document text
    • https://bacninhonline.com/webroot/img/files/47982709100.pdfIn PDF document text
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/zagelelorolero.pdfIn PDF document text
    • http://cbestdesign.com/ckfinder/images_store/files/52400590559.pdfIn PDF document text
    • https://jmcoverseaspvtltd.com/uploads/files/36084079691.pdfIn PDF document text
    • http://monroehighwildcats.com/clients/40160/File/12892861128.pdfIn PDF document text
    • https://miguktour.com/FileData/ckfinder/files/20210605_F13CB3CF401B36B7.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=cisco+ccna+routing+and+switching+200+120+pdfPDF 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_off0000d9e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F7 11232 bytes
SHA-256: fae1f3b9afd54aa28bdfd000e5e7697616f7fff1d955f7fdf9c99f56b85e1834
font_02_sfnt_off00010c34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C34 17288 bytes
SHA-256: d9370820da2cdb419425cf35a14e79aa3b71227b7de5b1ded9c8f3c8b8a6c22a