Malicious PDF — malware analysis report

Static analysis result for SHA-256 70554fcf4de49187…

MALICIOUS

PDF

89.4 KB Created: 2021-07-20 16:07:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 22f35f0df3e0ee393f015cd8f34622c0 SHA-1: da6c5c1c518f6f5d481aa1a45b40685c5afcca04 SHA-256: 70554fcf4de49187bf673a5a7a188b2abc3ae77320e0164b22a7b70909873363
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm pointing to multiple compromised WordPress sites, likely intended to host malicious files. The heuristic PDF_RANDOM_URL_LINK and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM indicate the presence of links to potentially malicious content hosted on these sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to deliver a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160acc642e73ca---49636077923.pdf In PDF document text
    • https://alakharia.com/public_html/userfiles/file/minesuviwusawu.pdfIn PDF document text
    • http://antwerp-reefer-tournament.be/argt/files/tifedavuxuxodub.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16091e18a82b62---dulapadiwuverudiwipeb.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/lafokoletatuzifogotebuzut.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/16091bedbb83c6---37635648828.pdfIn PDF document text
    • http://kojeneckezbozi.eu/userfiles/file/52960348354.pdfIn PDF document text
    • http://ridgefieldpark1967.com/clients/3/39/39eebdc8797e30ee23d4fd57d071fd44/File/xuwosuk.pdfIn PDF document text
    • http://techbico.vn/uploads/image/files/pukegugujuxop.pdfIn PDF document text
    • http://atomleasing.ru/media/File/pojom.pdfIn PDF document text
    • http://bhhangkhong.com/upload/images/files/xujisuforutasazotaberipal.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608447054d3dd---43533505785.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/ff5c13437b93bc58a1e566e0d9133ef0/kowemolibekujen.pdfIn PDF document text
    • http://generale-bureautique.fr/gdb/files/file/jusidafopadofexemiginopij.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6843208bcee94ca1eb41cee059e3c522/37819622731.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b7ab00524d---47804114222.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/0fe7309ffc45258eef849779b1504caf/39394759966.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ad2a1710797---ramazerewa.pdfIn PDF document text
    • https://irisapp.cn/uploadfiles/fckeditor/20210513/file/16208589059536.pdfIn PDF document text
    • https://www.ppmcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/93umah6fqdi3vl8m7qdrbavh4h/56763062204.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160c8799bf2ff2---rotidoxamajobarub.pdfIn PDF document text
    • https://rux-thai.com/ckfinder/userfiles/files/vakijuro.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/eff4e5df47ee5048ebb1b04350b6266a/48747704839.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/80a4324abdd2232744818d32ae50de3e/sevodevamefo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=the+peace+of+augsburgPDF 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_off0000fbe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE4 17096 bytes
SHA-256: 65b999f6cd012449b537479d4f6d3685c53d19fa10e50eccbb41d50287aa56bf
font_01_sfnt_off00012828.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12828 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001403f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1403F 10620 bytes
SHA-256: d0b30767228a85967b791bdef3d87d81c86aafb8b2e641e19adf7aaf3897bfbd

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