Malicious PDF — malware analysis report

Static analysis result for SHA-256 e19c873acb6b5778…

MALICIOUS

PDF

68.6 KB Created: 2021-09-27 17:54:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 61c937945dbb3542314be60c4a91de08 SHA-1: 744a8f29238868a7ee208985dc2cc60a202933df SHA-256: e19c873acb6b577814d4282e08b25622df60f8c49a86b51f4ca27d81a2ed90a3
176 Risk Score

Malware Insights

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

This PDF document is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing and trojan distribution campaign. It functions as a link farm, directing users to various compromised WordPress sites and IP addresses, disguised as search results for 'android app for watching movies'. The embedded links likely lead to further malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://medvor.ru/uplcv?utm_term=android+app+for+watching+movies PDF link annotation
    • http://namlinhchisapa.com/userfiles/image/file/98406781877.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161516c6c97b86---wadukuz.pdfIn PDF document text
    • https://bedandbreakfastchia.it/userfiles/file/nawemapufa.pdfIn PDF document text
    • http://immodraft.de/images/architekten_agentur_images_/file/rineduxekukalebeguxujo.pdfIn PDF document text
    • https://yaofangpeixun.com/upload/files/xupux.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/497c6feb2f1d75a381427256f2f569bb/38244021690.pdfIn PDF document text
    • http://whkmradio.com/userfiles/file/fumisokedu.pdfIn PDF document text
    • http://cu-hinothai.com/ckfinder/userfiles/files/75122542931.pdfIn PDF document text
    • http://circuitvietnamcambodge.com/hinhanh/file/22021843477.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133590e8b214---2155758694.pdfIn PDF document text
    • http://henzefashion.com/userfiles/file/xosigenejafijimesuziro.pdfIn PDF document text
    • http://gpe-el.pro/ckfinder/userfiles/files/47685622464.pdfIn PDF document text
    • http://www.sana-anong.com/ckeditor/ckfinder/userfiles2/files/mobovegijififik.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ad31c0d946---22048977045.pdfIn PDF document text
    • http://muzycznescyzoryki.pl/userfiles/file/devunekiwatiko.pdfIn PDF document text
    • http://eminenceinc.com/userfiles/file/37624631647.pdfIn PDF document text
    • https://klubkanine.com/home/klub/public_html/ckfinder/userfiles/files/rubetamolasenopatezosob.pdfIn PDF document text
    • https://miltonmattox.com/userfiles/file/30844025600.pdfIn PDF document text
    • http://avvolodin.ru/upload/file/10997818143.pdfIn PDF document text
    • https://lee-trading.tw/archive/upload/files/nimufadunufoxegilutewuw.pdfIn PDF document text
    • http://140.121.125.49/ckfinder/userfiles/files/20210903_031401.pdfPDF link annotation
    • http://tevukasveza.lt/ckfinder/userfiles/files/69259912477.pdfIn PDF document text
    • https://yakin-surewin.com/media/file/16405303556.pdfIn PDF document text
    • https://maximatrimony.com/ckfinder/userfiles/files/sakuruvovejokuxomanodo.pdfIn PDF document text
    • https://zohopin.com/calisma2/files/uploads/9808596015.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://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_off0000b19c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB19C 15424 bytes
SHA-256: 30f86089b06f7c934afac3051c9c91deb96c80140bf2f12a3b632366b77d03bb
font_01_sfnt_off0000d80b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD80B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f022.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF022 11156 bytes
SHA-256: 25399ae2a4106689981c222671ee6c22c9c5065b441eacd45d3c4d5988bd9f08