Malicious PDF — malware analysis report

Static analysis result for SHA-256 145f27b0065ab4dc…

MALICIOUS

PDF

125.1 KB Created: 2021-09-04 23:13:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1f1acc6b3d4e842d16fbee11f989494e SHA-1: 7dc6c8375a86784d6793410ffa2bbe6baefc815b SHA-256: 145f27b0065ab4dc1a0652434176500104f811c3a3c53cb3797a3c1e00ce0ce3
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised WordPress installations. The embedded URLs suggest an attempt to distribute further malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/0h44jhp9e6lrmhoclssstjpub1/8303432350.pdf In PDF document text
    • https://conviviodihera.it/dati/upload/file/motapojamenilogodezozu.pdfIn PDF document text
    • http://rickgrisolia.com/userfiles/files/25582009218.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f61862e37e---ribodidap.pdfIn PDF document text
    • http://lyzph.com/userfiles/file/Fl202108191745202216.pdfIn PDF document text
    • http://grubstreet.ca/ckfinder/userfiles/files/3122903368.pdfIn PDF document text
    • http://tktravel.shop/FileData/ckfinder/files/20210605_78A76A6B7F1BA58E.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df28eaebc42---37643374541.pdfIn PDF document text
    • http://psychologyforeverybody.com/ckfinder/userfiles/files/52841971702.pdfIn PDF document text
    • http://aedelsur.com/contenido/files/parafibaxezalakezigi.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612a0145a7000---pagum.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160ce23e2bd124---14001748014.pdfIn PDF document text
    • http://thessalonikiflights.com/files/files/wizuwodonuwulu.pdfIn PDF document text
    • https://tckontrola.hr/files/popukoredi.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/34015450696.pdfIn PDF document text
    • https://radmangroup-ye.com/rgfiles/file/bozufawokimomofijanobus.pdfIn PDF document text
    • https://fl-forever.com/upfiles/editor/files/napawikezimurira.pdfIn PDF document text
    • http://carefirstwalkathon.com/clients/8/89/89514deb4c0e8807eb046cac28c4977f/File/32255734976.pdfIn PDF document text
    • http://dalboncostruzioni.it/userfiles/files/maxogapedafav.pdfIn PDF document text
    • http://canavesiobruno-architetti.it/userfiles/files/96367495859.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/70380888872.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=el+manual+moderno+pruebas+psicologicasPDF 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_off00017d1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17D1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001952d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1952D 21808 bytes
SHA-256: 49bbd598ee7d7debf7901c717c94ecb43216547f5e600a7453aad9fa7dcc900b
font_02_sfnt_off0001cc3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CC3B 10984 bytes
SHA-256: 8cc5c4524a69750f4ac339da2453d62add350d45a853e8cafc80f2d5aac1fb47