Malicious PDF — malware analysis report

Static analysis result for SHA-256 71c155ad0e0e48b2…

MALICIOUS

PDF

80.1 KB Created: 2021-09-04 09:10:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2afbe841d950c9121a689405deb1efb0 SHA-1: 2ee7ba4acc4c0ee1875bbfc0bca07ebcca6711c0 SHA-256: 71c155ad0e0e48b2c3b18f9be1de013dfeeb6b10c938414824e999d7f918707b
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Several heuristics point to the PDF being a link farm, with many URLs hosted on potentially compromised or disposable domains. The presence of these links suggests the document is designed to lure users to external sites, possibly for phishing or SEO spam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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 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://61kidsclub.com/userfiles/file/92151427703.pdf In PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160cec5c5d0582---tutuwokutiwenonu.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/51090548488.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16086c9b17f7a8---11036161186.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/revozomofutezarofemujoliz.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/t85pvda01n06cok9jur07lcri6/28642941988.pdfIn PDF document text
    • https://domilot.com/uploader/files/bupabedakenideluluza.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/iuadro7o83r53veajg0ea0kuu7/suxosekoxamiw.pdfIn PDF document text
    • http://www.oneworldkarate.com/fckeditorimages/userfiles/file/penijudatexikab.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1611437fd979a8---kerizegi.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fb068242d8---bumadupivu.pdfIn PDF document text
    • http://sklenicky-obchod.cz/web/admin/fckeditor/userfiles/file/deladax.pdfIn PDF document text
    • https://laplacedesstores.com/upload/file/mumofijefimufozodasag.pdfIn PDF document text
    • http://rheumatology.instituteupload/content/file/64888084849.pdfIn PDF document text
    • http://rexant.by/upload/editor/files/50087211390.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/7f70edaa8d5699ffb42bed191ee1eeef/85877089134.pdfIn PDF document text
    • http://www.facyt.com.ar/ckfinder/userfiles/files/migonubetejiti.pdfIn PDF document text
    • http://clevio.biz/fckUpload/file/vugoj.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/lhq2if22scffqtrdd81q37h625/25680417386.pdfIn PDF document text
    • https://zoomkish.com/basefile/zoomkishcom/files/86116292157.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=solving+absolute+value+equations+coloring+activity+worksheetPDF 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_off0000d19b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD19B 11328 bytes
SHA-256: 5706b5398b9b9a33aa012f49421719c7f7dede8d9ff387c3b4d1d46464587ba4
font_01_sfnt_off0000ebff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBFF 18304 bytes
SHA-256: ceb3a305eaa2bb4049f6ef04f0ddb854c7b3ee647c1ca4b71850375d3c57d038
font_02_sfnt_off00011aa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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