Malicious PDF — malware analysis report

Static analysis result for SHA-256 9870f47fffbc518d…

MALICIOUS

PDF

95.1 KB Created: 2021-07-22 23:14:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 30506c48c2dfb4b0def748e2968f5ab6 SHA-1: a442edc1c955a20565db627ccc94d2b70b779828 SHA-256: 9870f47fffbc518d0c8fc11455a21408b2c3f5bb175f046d4d3d74c7a8f0fe2b
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised CMS upload directories and disposable hosting, indicative of a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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 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://haysalon.com/public_html/userfiles/file/3919224761.pdf In PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec614466e4---46299522752.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607175b141bf2---lorudisijolawaf.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/94253467635.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c2662146af6---gedefisu.pdfIn PDF document text
    • http://www.rify.us/cms-uploads/files/46387962294.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cac25125fe---89382849398.pdfIn PDF document text
    • https://mindspacepsytherapy.com/upload/ckfinder_temp/files/20210526224257.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4f178017f6---80359866090.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a40e6f68615---57870870584.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/67021700985.pdfIn PDF document text
    • http://biblioteka-koneck.pl/ckfinder/userfiles/files/55827555173.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/0c0ede3f4fd555017a95a781446072e8/metitukon.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/loliw.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/6ab306fa299bb3ef09a4ec35e06eb4e1/lupagimizisikel.pdfIn PDF document text
    • https://pharmalogindia.in/ckfinder/userfiles/files/6448812183.pdfIn PDF document text
    • https://kominove-centrum.cz/media/files/file/87599200515.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087b7e07f248---75191696723.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/rosemuzejegudejoju.pdfIn PDF document text
    • http://mxm-hosting.nl/img/editor/file/nuvimapamuxigenirat.pdfIn PDF document text
    • http://school15-tyumen.ru/f/sakipapofimogigilurex.pdfIn PDF document text
    • http://alexanderkanevskyartgallery.com/clientMedia/file/51939436569.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d4376b50206---68686726100.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=most+common+japanese+dialectPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF0E 10700 bytes
SHA-256: 445e0f0d07449607ed53de811b6299d85bb9d0a4b54fbe5ceb36c6959e1ae09a
font_01_sfnt_off00010794.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10794 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011fa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA6 16764 bytes
SHA-256: b349d39cee52e4e8ee7dc861b4e5166474165a99f4e1193d6c5e7ebb20f7bde4
font_03_sfnt_off00014b7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B7B 10040 bytes
SHA-256: f346f4463d5de6af8bba939a7b282b272f30c468d2cca3725e4c1798bd4d7eb1

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