Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b2d41fc0d573c0e…

MALICIOUS

PDF

69.6 KB Created: 2021-09-25 14:56:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: e2c68cab825e546715cb80763fa3006c SHA-1: d29baf6152a32956735c2bceea7906055c3b41f4 SHA-256: 9b2d41fc0d573c0ecc03c951184aa15f102e11b21c1df968639f6d5fa540a07e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to multiple disposable hosting sites, indicating an attempt to obscure the ultimate destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/fa8c56d843f71b4700b833fb95dc273f/xaleraruwofadexiravup.pdf In PDF document text
    • https://processwork.archerhuang.com/ConImg/files/zepajutupexize.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16134cea88e08f---77950882948.pdfIn PDF document text
    • http://studiotecnicolari.it/userfiles/files/61883155537.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/084a1efb6a08a0d4001f5132b199084c/nesiwixolodalubajidone.pdfIn PDF document text
    • https://irrisyst.eu/files/file/67452298382.pdfIn PDF document text
    • http://ingore.cn/upload/files/soxer.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/f600d5fd4dc441756c1c583f95999554/91961205113.pdfIn PDF document text
    • http://anapro.com/ckfinder/userfiles/files/duzomubebep.pdfIn PDF document text
    • http://mega-gold.com/userfiles/files/wigadafadakep.pdfIn PDF document text
    • http://kramor.bg/userfiles/file/bibofi.pdfIn PDF document text
    • https://www.peltonfell.org.uk/ckfinder/userfiles/files/veganowedinimadokin.pdfIn PDF document text
    • http://fqcycpa.com/jingkelun/userfiles/files/20210916090721.pdfIn PDF document text
    • https://brillimet.com/uploads/files/202109160545348764.pdfIn PDF document text
    • http://kowel.com/ckfinder/userfiles/files/1631704504.pdfIn PDF document text
    • http://hotechike.com/files/files/62978936992.pdfIn PDF document text
    • http://livilgirls.com/files/rotanatukokaboturixer.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/ba47d4db39c72aba79781aeecf40cd1d/89362809844.pdfIn PDF document text
    • http://pujcovnanaradi-tvarozna.cz/userfiles/files/zogumabepa.pdfIn PDF document text
    • https://paulogomeslda.com/userfiles/file/74005614000.pdfIn PDF document text
    • http://centroolosprato.it/userfiles/files/vizobo.pdfIn PDF document text
    • http://tsutae-f.com/js/upload/files/gidiketolixodadalaru.pdfIn PDF document text
    • https://dakotaterritorydevelopment.com/ckfinder/userfiles/files/kudijadajoborurajukuwod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=is+water+spinach+high+in+uric+acidPDF 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_off0000b1cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1CD 10764 bytes
SHA-256: 11e459d5358cc40cb884845732edc88862d68411df56618ebf051153609cf69d
font_01_sfnt_off0000ca5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA5B 15244 bytes
SHA-256: 4f913228cb3ee54811199f799eb2f8670c532d5ca760dec845ef0033f6800f7e
font_02_sfnt_off0000f0b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1