Malicious PDF — malware analysis report

Static analysis result for SHA-256 acc9ab57dcf6e2e9…

MALICIOUS

PDF

86.6 KB Created: 2021-09-10 23:07:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e8d4478fc36ca76856961e3a8bbad10a SHA-1: 1efe522138af833e436381987a68c2815dd495a8 SHA-256: acc9ab57dcf6e2e97bc8da995780d54d1b196185f719f08ec4ef0868d15e92b3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to external, potentially compromised or disposable domains. The presence of 'utm_term' parameters in some URLs suggests a phishing or SEO manipulation attempt to lure users with specific search queries.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://synerhu.ru/uplcv?utm_term=vanced+tuber+apk PDF link annotation
    • http://associatedreclaimed.reclaimedoils.com/userfiles/files/64353339275.pdfIn PDF document text
    • https://tumsad.org/img/editor/image/file/nigufufeg.pdfIn PDF document text
    • http://firegallery.ru/img/upload/kolunavupapapana.pdfIn PDF document text
    • http://tentauto23.ru/ckfinder/userfiles/files/44624070755.pdfIn PDF document text
    • https://chowdhurytourism.com/ckfinder/userfiles/files/mufipe.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612eae7a34199---vejoxotukexizosad.pdfIn PDF document text
    • https://avukatwebsitesi.kocgrafik.net/upload/files/goriduritogupu.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/40225976363.pdfIn PDF document text
    • https://adian.eus/files/galeria/files/mezurat.pdfIn PDF document text
    • https://bfull.ru/uploads/files/37133260385.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/14f641f532da3c1adce90f7c0aee3eff/65884156423.pdfIn PDF document text
    • https://dgssu.com/upfolder/e/files/20210903130707.pdfIn PDF document text
    • http://vzwsportenmuziek.com/content_docs/28457079596.pdfIn PDF document text
    • http://geonatlife.es/ckfinder/userfiles/files/61526423397.pdfIn PDF document text
    • http://www.farmaciapenil.es/userfiles/files/fiwenilaluwi.pdfIn PDF document text
    • http://www.sctiec.com/up_files/FCK/file/vevewim.pdfIn PDF document text
    • https://gionggiacam.gagiongvitgiong.com/ckfinder/userfiles/files/junarubitumozasanamemu.pdfIn PDF document text
    • http://www.jucadent.es/ckfinder/userfiles/files/wikadowineje.pdfIn PDF document text
    • http://boldogelet.hu/media/mijabasogapuwugitu.pdfIn PDF document text
    • https://ncltandatbar.com/home/ncltandat/public_html/dowalumniusa/ckfinder/userfiles/files/moboni.pdfIn PDF document text
    • http://hide-bo.com/img/tmp/file/29557258369.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/16138666399797---41502233709.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c722.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC722 10384 bytes
SHA-256: 9e1b37b270f1aeb85bae6ee9b11f3092369b41aec37da9807dd134112163ff52
font_01_sfnt_off0000de87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f694.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF694 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
font_03_sfnt_off0000fe8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE8B 16160 bytes
SHA-256: fa5cbea137587b1d4bb1c548ff3f8d17a18587fe273de630a8d80f12e69f99e4
font_04_sfnt_off00011422.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11422 21972 bytes
SHA-256: 5525373644e739abc12b2fd627ab6279023966b7efd962e610d9dd86c0b76ea0