Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6b35087856487ba…

MALICIOUS

PDF

74.3 KB Created: 2021-09-17 09:19:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 957e1af74d882da57d318aea2f9635cd SHA-1: 056212e9dc44d476b04cd257f429d4713338c40e SHA-256: b6b35087856487bacd57d42d1c8f4e9a986ed9a797eabe307cdbd09d9bb2c738
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are algorithmically generated and hosted on disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://infrive.ru/uplcv?utm_term=redmi+4+miui+12+update PDF link annotation
    • https://soenen-pneus.com/upload/file/kumumonazusorojetujedarur.pdfIn PDF document text
    • http://energy-labels.nl/userfiles/file/kanojorufira.pdfIn PDF document text
    • https://lifecareproduct.in/ckfinder/userfiles/files/70536634959.pdfIn PDF document text
    • https://akilanews.com/ckfinder/userfiles/files/wobogufuxemurezol.pdfIn PDF document text
    • https://onderdurdu.com/upload/ckfinder/files/lojirepopusenakuk.pdfIn PDF document text
    • https://hoangphatdanang.xetnghiemadndanang.com/uploads/image/files/julazani.pdfIn PDF document text
    • http://alhambra.kopanramen.com/uploads/files/56668075137.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/mitugajatinulexufige.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/33442514758.pdfIn PDF document text
    • http://boki.hu/editor_up/lofixakemigo.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/fbc8ba8467aa62dbbf5953361b581ef2/jebozuw.pdfIn PDF document text
    • https://mobilieroccasion.fr/uploads/file/zagumanesewuwizexajomob.pdfIn PDF document text
    • https://univerosg.com/ckfinder/userfiles/files/54265337361.pdfIn PDF document text
    • http://supragyn.cz/userfiles/file/sigotinujivuvij.pdfIn PDF document text
    • https://prestinieurope.com/userfiles/files/tipigu.pdfIn PDF document text
    • http://meyergarden.com/ckfinder/userfiles/files/32657914893.pdfIn PDF document text
    • http://pajurioverslas.lt/ckfinder/userfiles/files/81441042354.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614074a94d0b5---merijufonujof.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/lulvunf7np6b0kvuda6bhtqmm1/dolononokafaxataxan.pdfIn PDF document text
    • http://hidropro.hu/upload/lakavixuxosobubuvowarasi.pdfIn PDF document text
    • http://studiogaleazzo.eu/userfiles/files/rekobosifovepi.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/0c9af64c86f9f79e087a16f3bf903ec0/nalobuguseposugajezamadi.pdfIn PDF document text
    • http://massvt.sk/editor_uploads/system/files/83037751314.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/59812378878.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/40468671542.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_off0000c058.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC058 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d86f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD86F 10412 bytes
SHA-256: 2a62e52428407832d60d4d1ac0b65bcec765b4181dc2c15cb9716d8176602065
font_02_sfnt_off0000f01d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF01D 16696 bytes
SHA-256: 223580cdff703261221fc1d16f00498253b941112ff2e9d9233ff75ba7da3f66

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