Malicious PDF — malware analysis report

Static analysis result for SHA-256 136bac4d6d8011ad…

MALICIOUS

PDF

79.8 KB Created: 2021-09-17 01:56:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 16e998a0be7ffd256df5e93f2f0c90a1 SHA-1: eb53f0994713cc276c780a1ba627a3fa46d8a309 SHA-256: 136bac4d6d8011ad6d8e318a9b144b17c7ef0341b89fb88d230cbb8a0f24b327
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains a link farm pointing to various compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of external URIs and link farms indicates a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://nomylo.ru/uplcv?utm_term=macbook+pro+dual+boot+ubuntu PDF link annotation
    • http://lamay.de/userfiles/file/putedexel.pdfIn PDF document text
    • https://mpksieradz.pl/upload/file/xegodipoz.pdfIn PDF document text
    • http://hanyuchina.com/upload/files/13390052439.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/4071e7e59b8f8356626149aedf07f153/segapunekonudorem.pdfIn PDF document text
    • http://castel.lu/userfiles/files/razatiwowazanixafojaki.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16143a29b30628---46595316263.pdfIn PDF document text
    • https://gberwanda.com/gbe/useruploads/blogs/files/5334032888.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613071292fd5f---xatuwu.pdfIn PDF document text
    • http://skidubravy.sk/spravca/ckfinder/userfiles/files/mimedogubemesi.pdfIn PDF document text
    • https://immo-cjeanpaul.lu/userfiles/files/96982570691.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/40819897454.pdfIn PDF document text
    • http://bratislava.topenglish.sk/app/webroot/gallery/files/movirixawefesukavumefe.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/1818b744e98050362fb2491ff0b64c9f/14958616612.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613f178fd6d31---gepoxopanibobuzukas.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/168842769613310691e6c5.pdfIn PDF document text
    • https://maintogelonline.info/contents/files/73539952524.pdfIn PDF document text
    • https://pensionradvanice.cz/res/file/voroxukaniropoxazixoz.pdfIn PDF document text
    • http://www.santamyoga.be/images/file/87816553277.pdfIn PDF document text
    • http://liily.jp/upload/file/20210907205509.pdfIn PDF document text
    • https://kimcert.org/E/file/kezalepopozulubut.pdfIn PDF document text
    • http://www.moyekolodin.com/files/92636647952.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/9016add01a18fd158461619e14d58cdd/57516286211.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_off0000d260.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD260 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA77 10440 bytes
SHA-256: f812d2290da4f1b6aa96b01501cec6ea1923f8d8e0fb15503cfd10cad3aef1fb
font_02_sfnt_off0001020c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1020C 18284 bytes
SHA-256: e00ffc7298f43792421cbcdc625048ec9dacf4e98519c10f0d31c50128e52fe1