Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d53b875a0fa5fcd…

MALICIOUS

PDF

69.2 KB Created: 2021-09-17 07:49:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 4206ab436cf7554a0879fcfc18c2c6e6 SHA-1: a0f2988bfd863d37fce17975c8f99ba782345830 SHA-256: 1d53b875a0fa5fcd6ca1d351e9efc53ac1c1c4dd75bedf038469e4569c1c82ca
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, forming a link farm. The primary purpose appears to be directing users to external, potentially malicious, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 https://queure.ru/uplcv?utm_term=what+is+after+trillion+in+numbers PDF link annotation
    • https://52fantasies.com/home/holly/public_html/ckfinder/userfiles/files/90203313898.pdfIn PDF document text
    • http://saconsultancy.com/userfiles/file/47281674163.pdfIn PDF document text
    • http://neodentpetrosino.it/userfiles/files/95691180096.pdfIn PDF document text
    • http://webursitet.org/Files/file/28746492233.pdfIn PDF document text
    • https://quangcaowebsite.xemlaco.com/uploads/files/segemutav.pdfIn PDF document text
    • http://besttailor.info/ckfinder/userfiles/files/52353320042.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/bda93bb657gqn8si204s2d34t8/pelew.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16133606410826---30784285822.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/161440b7b48b09---13174963127.pdfIn PDF document text
    • http://mirsistem.com/depo/sayfaresim/file/97188007822.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/b533b12426b960e109c1ebbf0530a690/59794544926.pdfIn PDF document text
    • https://perfecthospitals.org/ckfinder/userfiles/files/jokut.pdfIn PDF document text
    • http://betheaskssd.com/flash/betheaskssd.com/file/pedonirilowivajaleri.pdfIn PDF document text
    • http://bbbo.handyfriendship.com/upload/files/dowupa.pdfIn PDF document text
    • https://solturism.ro/images/file/59591944299.pdfIn PDF document text
    • http://konemara.hu/userfiles/file/3107743081.pdfIn PDF document text
    • http://futureinfashion.com/ckfinder/userfiles/files/jetabinabogur.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/84458477920.pdfIn PDF document text
    • http://orthopediedelft.eu/files/daporabijubusasegotaro.pdfIn PDF document text
    • http://cafesezony.ru/fck_editor_files/files/dukaluwa.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/47504762370.pdfIn PDF document text
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/xufija.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_off0000af8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF8A 10712 bytes
SHA-256: 5b21f59cef0acf9dc68c9ad38a46b4732e561158b61fe66e9acecb3419913def
font_01_sfnt_off0000c7f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e009.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE009 15560 bytes
SHA-256: 23ec1ed5181133573c1bf68bca6410f1eb99afe005e106918fdf682679394b95