Malicious PDF — malware analysis report

Static analysis result for SHA-256 00fa6430c81fc87c…

MALICIOUS

PDF

78.6 KB Created: 2021-09-10 12:58:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 621866d5163319f7f6f1daa3b91047fb SHA-1: 874ea2dac95a9101f92a1a8f55aef1eec635fdcf SHA-256: 00fa6430c81fc87c06390dc73a40f322f0db2aa51ffec67f3d28c9d100a8cb96
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs that point to various domains, many of which appear to be disposable or compromised hosting. Heuristics indicate this is a link farm designed to redirect users, with one URL specifically mentioning 'mod apk' suggesting a potentially malicious software lure. The ML classifier and ClamAV detection strongly support the malicious nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://inwebjor.ru/uplcv?utm_term=little+empire+mod+apk PDF link annotation
    • https://hsse.hssanesteban.cl/files/31714650762.pdfIn PDF document text
    • http://tchid.net/userfiles/file/wimojigomuzefeviwigi.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/16136aea12546a---fafil.pdfIn PDF document text
    • http://deshdunya.com/blogimage/file/nowosaf.pdfIn PDF document text
    • http://filtrydokoparek.pl/img/all/5870909158.pdfIn PDF document text
    • https://tolgyesvolgy.hu/userfiles/file/23636334628.pdfIn PDF document text
    • http://dakdekkersindex.nl/images/uploads/pugomava.pdfIn PDF document text
    • http://elitk.ru/_files/wopakelilenaxikejozara.pdfIn PDF document text
    • https://felicityokolo.com/file/71295077479.pdfIn PDF document text
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/80103846597.pdfIn PDF document text
    • http://sinice-rasy.cz/files/file/84298853640.pdfIn PDF document text
    • http://cnsgawefgl.netsociality.com/upload/files/wotaxu.pdfIn PDF document text
    • http://bapassamarinda.id/assets/ckfinder/core/connector/php/uploads/files/48730738009.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/vukasavaveb.pdfIn PDF document text
    • https://nyirfa.hu/uploads/files/73454780595.pdfIn PDF document text
    • http://smingames.com/ckfinder/files/99896129491.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613abb3d301c3---nadenaf.pdfIn PDF document text
    • http://zenobiacultura.it/userfiles/file///gafulufajatupunikolepafok.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/nbn6bs3l0v01sh0akob5a4sqd2/jozarofunedibojikedu.pdfIn PDF document text
    • https://xn--bren-mgenwil-gcbf.ch/sites/default/files/fck-uploads/file/balovubaxabevixuvod.pdfIn PDF document text
    • https://kccegis.com/upfiles/content/file/20210910065035.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613471b2584b8---59298782808.pdfIn PDF document text
    • http://siamintertrade.com/file_media/file_image/file/73693169014.pdfIn PDF document text
    • http://sipzip.com/userfiles/file/15695721689.pdfIn PDF document text
    • http://leadershipcareer.kr/fckeditor/_upload/file/16636520959.pdfIn PDF document text
    • https://flexi-cms.com/uploads/file/suniw.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_off0000cf4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF4F 18008 bytes
SHA-256: 2c2e506d0e12b893d38e8d611631b4def0f58795ca41cb9ff217fdbb37c70a2d
font_01_sfnt_off0000fe04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE04 10332 bytes
SHA-256: 1815e9c0dd9b9829c598f6c428f9be5d4ec12569e8db016e91d96c808f78840d
font_02_sfnt_off0001153c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1153C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1