Malicious PDF — malware analysis report

Static analysis result for SHA-256 7959000891592acb…

MALICIOUS

PDF

83.5 KB Created: 2021-08-06 12:03:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f2dfa2e13d4482001145db6f03e4c938 SHA-1: f1dced9ee7554da7cf087d33111de6598c619228 SHA-256: 7959000891592acbe854b0179f294a10ca61e0deda9b4ed10e778b6736dc5e17
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. Additionally, the document exhibits characteristics of a link farm, with numerous URLs pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious or phishing content. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://www.guus.edu.mn/ckfinder/userfiles/files/16149732894.pdf In PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a89pleavqmk124ed57qts53uu1/robufesikoxobetezomafavo.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bf7a04972eb---97779679360.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/7238001a1f9606d34848425cfa4dd9c2/fozinafup.pdfIn PDF document text
    • http://gardatrans.com/content/Files/jigojem.pdfIn PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/99570462269.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/bfd1aa455c565c6ef14ebda75716acb0/litazamakigiluvatovez.pdfIn PDF document text
    • http://msiutilities.biz/documents/nivevovafubomufusugozekox.pdfIn PDF document text
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160742cb9d63d0---kumulonot.pdfIn PDF document text
    • http://sonarkella.com/userfiles/file/29127241306.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/f1e7bdea8a431fb9826ea94b24fdaabd/75991597968.pdfIn PDF document text
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/lqhnc81hp2ktmm847bf1ouejtm/rizimitadowufasumerix.pdfIn PDF document text
    • http://ipublicity.cz/data/file/17898313922.pdfIn PDF document text
    • http://hoilhpnqbthanh.com/upload/file/61577618660.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3eadb8aa00---kutogokenusadefavupepuw.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/s7i4gndt75ipcjhcajjp5o578f/7519076419.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/51777632839.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/31095002321.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089cad809d11---8076552735.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/legatemafodabolevijo.pdfIn PDF document text
    • http://wf515345.tw/CKEdit/upload/files/2142216460.pdfIn PDF document text
    • http://sincaremedicaltour.com/js/upload/50541083667.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160e5110c9046a---vudizabil.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.net/FileData/ckfinder/files/20210620_FAD90E50D5438A37.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=descargar+musica+de+julion+alvarez+el+amor+de+su+vidaPDF 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_off0000c8d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8D4 18044 bytes
SHA-256: 071ca177408f074cb3e52fca69d2d9dfaa5d1042df9d8bec589e368620a5c053
font_01_sfnt_off0000f746.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF746 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F5D 10972 bytes
SHA-256: 00ea3f3af98eb10ec7ec01aab2add25c68d19f5b903e6269533728d790ca0469
font_03_sfnt_off0001289b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1289B 16364 bytes
SHA-256: ca2602d65a375fbe02fa3e7c81e1256e47710d68609654fc75c88204174a9643

Open this report in the interactive analyzer, or submit your own file for analysis.