Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab70be8c44ff4d3f…

MALICIOUS

PDF

86.4 KB Created: 2021-09-14 01:25:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f84e0924a4b405738f4ecf12b4e763aa SHA-1: 81b1e1992d7502350895b6be14a5a72286101f25 SHA-256: ab70be8c44ff4d3ffaa90d330cef8df8cab036b7b6f1c86b29b24e7ac377a459
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many embedded URLs pointing to compromised CMS upload directories. These links likely serve as lures to phishing sites or downloaders for further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://get-insurance.in/ckfinder/userfiles/files/gusonerotibiveninuromim.pdf In PDF document text
    • https://computerzone.pk/file/gibiwatovibatev.pdfIn PDF document text
    • http://csc-021.com/userfiles/file/20210909131805_h9rx08.pdfIn PDF document text
    • https://primer-spb.ru/files/files/14460163419.pdfIn PDF document text
    • http://slmj8.com/data/userfiles/files/dewuminukosoxewokagevix.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f780f6e67c---sekiwinujerif.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9bfc1b258---33609830842.pdfIn PDF document text
    • http://dataprint.ie/uploads/file/70467313747.pdfIn PDF document text
    • https://fokusmedia.com/images/uploads/65570376899.pdfIn PDF document text
    • https://hoya.hr/UserFiles/file/54418187947.pdfIn PDF document text
    • http://liburnia.pl/userfiles/file/38079428751.pdfIn PDF document text
    • http://www.romanschatztruhe.de/img/files/zirikekalowosikokekukaxir.pdfIn PDF document text
    • http://mvpbuilding.com/userfiles/file/5856876297.pdfIn PDF document text
    • http://dlabiura.kbo.pl/ckfinder/userfiles/files/jetofalisimosokofake.pdfIn PDF document text
    • http://22vek-omsk.ru/fck_editor_files/files/47222205526.pdfIn PDF document text
    • http://monikaknoblochova.com/userfiles/file/42823315540.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/ledurefitagimugu.pdfIn PDF document text
    • http://murasakijr.com/uploads/files/3625354191.pdfIn PDF document text
    • http://innotack.com/userfiles/file/bomawuvuwezazegifumudo.pdfIn PDF document text
    • https://lexcochoralsoc.org/demo/lccs/beta/userfiles/files/87081749750.pdfIn PDF document text
    • http://www.taimaobi.com/admin/ckfinder/userfiles/files/jokujujerafedoburotani.pdfIn PDF document text
    • http://minhtoangalaxyhotel.vn/app/webroot/files/ckfinder/files/nixuxowetajuk.pdfIn PDF document text
    • https://www.afoa.org.ar/backend/ckfinder/userfiles/files/zejanowolozolatamubejapa.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/6df3026d97cc95c0291b30ccb144cb74/difisanofofivegotewebodu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=the+last+of+us+revolverPDF link annotation
    • 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_off0000edcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000105df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105DF 17880 bytes
SHA-256: 6e7e4a0953b15b78bc00224149d0beea3d1e31dee1967bae663496e3093f01d9
font_02_sfnt_off00013488.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13488 10244 bytes
SHA-256: 3df844944b267d97f0f16678667666d4f7d3ae8777b6e90bff3c541b642889a0

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