Malicious PDF — malware analysis report

Static analysis result for SHA-256 83e6975a321115b5…

MALICIOUS

PDF

87.8 KB Created: 2021-09-08 02:16:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a8a3628dc80c7f0eab10c9038891defb SHA-1: b04f894334db44f3bd6fc4cd0001174ce61d58fa SHA-256: 83e6975a321115b5944236b69bcb9380223ca18aa8ba0242ced197b86d728e75
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous links to external websites, many hosted on compromised or disposable domains, indicating a phishing or malware distribution attempt. The presence of PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics, along with ClamAV detection as Pdf.Phishing.Trojan, strongly suggests malicious intent. The file likely serves as a lure to direct users to malicious content hosted on these external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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 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://krisoc.ru/uplcv?utm_term=effervescent+tablets+review+pdf PDF link annotation
    • http://amidoux-peintures.com/ckfinder/userfiles/files/93904130705.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/5db4d27a368fa3694580a823923475ee/46780435897.pdfIn PDF document text
    • https://gregor-biffiger.ch/userfiles/file/jigalotixoz.pdfIn PDF document text
    • http://tjclassof1971.com/clients/1/16/169b02496b2253913efe31a5b05f4f66/File/42637828301.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/vgmlcdafcrj0mlnl6l6uh7t1gt/52806959300.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/87393696994.pdfIn PDF document text
    • http://ambulatorioveterinarioilghirlandaio.it/userfiles/files/kebemogugol.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160ada7e95fb1e---xowuzugakemikapi.pdfIn PDF document text
    • http://qlionshousing.ca/userfiles/file/riwaxuga.pdfIn PDF document text
    • https://alzubidi.com/userfiles/files/goronezapinebapo.pdfIn PDF document text
    • http://sllight.ru/design/img/upload/file/43780643523.pdfIn PDF document text
    • http://www.samuitns.com/image/upload/File/47183380597.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/givufibobubipapoj.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083b93fe46ed---zunonisegudajidixev.pdfIn PDF document text
    • https://dacola.com/upload/files/vebakifunaxovasijut.pdfIn PDF document text
    • https://bi-kiesabbau.de/cmsimple/images/file/gejomunotasotefe.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/82959418116.pdfIn PDF document text
    • http://timebank.ru/sites/default/files/photos/pagefile/27895572095.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/38972879946.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/l53r8n5g9ptvg01g9k5gjs2p94/43910702301.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/1b1c14f8af59c4c6e374bd9152a06e9e/nolezunanajewopam.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160815b06e57c6---87123116026.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/48001220874.pdfIn PDF document text
    • https://metal-et-verre.ch/ckfinder/userfiles/files/48787538000.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/7kgssdg26iivaf1vc3atq9u3s5/79127740803.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_off0000f0a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A8 18396 bytes
SHA-256: acc10b5690c3716025ee792e9d192d9659f68d87186507f4490ade0c2c64c1b6
font_01_sfnt_off0001210a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1210A 10768 bytes
SHA-256: 1e13e2f79326a9d3c6ca08283c03abbe486a240069adf50349581b8050fa441e
font_02_sfnt_off000139cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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