Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1b01494b07b96bc…

MALICIOUS

PDF

69.8 KB Created: 2021-09-09 03:51:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: df55ecb18ab7c575302acd8add7e1f23 SHA-1: 843ddf1403bb43e0dbf55707217b780690dbf6c5 SHA-256: b1b01494b07b96bc9cbca434a1f393538b9625cdbfeeb51b302940231f9807b4
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many hosted on compromised or disposable domains, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this, pointing to a pattern of using link farms for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132b696f2a48---lebebabe.pdf In PDF document text
    • http://budohurtsa.pl/userfiles/file/gezududexurapotisowag.pdfIn PDF document text
    • https://olivierdaulte.com/ckfinder/userfiles/files/46305888247.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/72600023100.pdfIn PDF document text
    • http://esejsc.com/upload/files/relebufebapekaxukegiluve.pdfIn PDF document text
    • http://thuexe7cho.vn/upload/files/vajebasilaxutoxo.pdfIn PDF document text
    • https://mfdesign.hu/files/file/lofimawojulawozoj.pdfIn PDF document text
    • http://giaexploring.it/userfiles/files/katogegowipoxiduz.pdfIn PDF document text
    • http://uteambio.com/upload/files/xukit.pdfIn PDF document text
    • http://planetamama.ru/files/file/73051735782.pdfIn PDF document text
    • https://internationallanguagenavigators.com/media/pizidefusuzo.pdfIn PDF document text
    • http://schuetzenfest-hemeringen.de/ablage/userfiles/files/xumipam.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/a41f392262725f057b9d7f862e48320a/duwozaju.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613453869c582---fukafokanu.pdfIn PDF document text
    • https://greenfuturevietnam.com/Upload/files/2997861309.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613867e38acb3---pakalomawabuxasuwi.pdfIn PDF document text
    • http://paroissedementon.fr/upload/files/sanafotup.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/35265919861.pdfIn PDF document text
    • http://educaholistica.com/resources/img/imagesck/files/sokibibaminemorotij.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/d98c31c0e39dfa457bd628e99da2e452/20297068478.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/d94a0d0c64e6ba1f9da34e53ba415331/vomojugukinejetine.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135d14234d14---xusowowesuvogoxipa.pdfIn PDF document text
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/31661546905.pdfIn PDF document text
    • http://winso.tw/userfiles/file/92050650582.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/16131f6f05ec36---ruwokowisosodafasuxitu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=gta+5+online+mods+pc+download+freePDF 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_off0000b434.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB434 14368 bytes
SHA-256: 00b2464f0d8fa108cdd6dee5c065980c8042f26d465e1f5b019309de2392bffd
font_01_sfnt_off0000d807.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD807 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f01e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF01E 11040 bytes
SHA-256: 1e91a34ddb840af2e70052f3b63d7412697568e440042567f65b45894b7df915

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