Malicious PDF — malware analysis report

Static analysis result for SHA-256 1146febe3fc8e2e3…

MALICIOUS

PDF

72.7 KB Created: 2021-09-05 19:18:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 29d3faf535678c422f86a75035f4e709 SHA-1: 2f826169b27b563868b9aa38986984a5f9fe754a SHA-256: 1146febe3fc8e2e3b644a63073e7f5b9894aa9a33a7675b3fd035fc211361d61
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and a machine learning classifier, indicating a high likelihood of malicious intent. The heuristics reveal embedded JavaScript and a link farm structure pointing to compromised WordPress uploads and disposable hosting, suggesting it's designed to redirect users to malicious sites. The presence of embedded JavaScript indicates potential for exploitation or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • 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 https://crewmak.ru/uplcv?utm_term=mordaunt+short+ms+308+subwoofer+manual PDF link annotation
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb6d962b4c3---zodupovajuw.pdfIn PDF document text
    • https://anaksemut.com/contents//files/93390040934.pdfIn PDF document text
    • http://biosite.ru/images/news/file/37851918438.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/dowisudedowaforumul.pdfIn PDF document text
    • https://yodobashi-church.com/pepivepodowizogita.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16104485883abb---manutep.pdfIn PDF document text
    • https://pubs-icfas.org/icfas_new/dev/ckfinder/userfiles/files/14199354089.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///xogirotugoluxifijovonaj.pdfIn PDF document text
    • https://u-spot.biz/js/ckfinder/userfiles/files/76782300682.pdfIn PDF document text
    • http://sshs1962.info/clients/3/33/33dcd814b32da85629335a95ab3d0158/File/jiwotanire.pdfIn PDF document text
    • https://pre-www.bridge-college.com/uploaded/ckeditor/files/dumiludifurekalo.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/purijusokinixi.pdfIn PDF document text
    • http://hmconcretemixingplant.ru/d/files/wewaxajebuzagesada.pdfIn PDF document text
    • http://ahdjcm.com/upload/files/gavugivuti.pdfIn PDF document text
    • http://svaz-podnikani.cz/files/file/2921432070.pdfIn PDF document text
    • http://creative-format.com/upload/editor/files/5720301810.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/jadodewikeziso.pdfIn PDF document text
    • https://giriconsultancy.com/content_files/files/14736102952.pdfIn PDF document text
    • http://gdwtechnology.com/fckeditor/file/56479738817.pdfIn PDF document text
    • http://gazosilikatnn.ru/uploads/files/pewimegebirevoxavelukep.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/2uu0k0n7d8bpu4ccq8ugtv1be2/60969330715.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/7akut52qpkj7mi9oiljul47h64/rewexuv.pdfIn PDF document text
    • http://shortguycentral.com/ck_uploads/files/retisazovu.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_off0000b8c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8C7 16196 bytes
SHA-256: 9af5f505d94948155dd81d62047c21eda64656697af73ebd8ff3ceea1945be7c
font_01_sfnt_off0000e2b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B6 11348 bytes
SHA-256: f875cf78b52f6cf67e76cffed90e959d284f71b64050873354c5ebd3d06f9c49
font_02_sfnt_off0000fd5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1