Malicious PDF — malware analysis report

Static analysis result for SHA-256 b10a6046366197e3…

MALICIOUS

PDF

96.2 KB Created: 2021-07-07 12:43:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6a29bff3acc074e41eec4fb1903d92fa SHA-1: 2e8b0395d21472d3081e4c855a3e7f3104c1e624 SHA-256: b10a6046366197e31aea9b8a27ada6557cee493d360e2e2aaf134ab5a0945eaf
156 Risk Score

Malware Insights

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

The PDF contains a link farm hosted on a compromised WordPress site, directing users to download other PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of multiple links to potentially malicious PDFs suggests an attempt to distribute further malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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 http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb4a6a2f21---vimiza.pdf
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/794444ed24570d44ad8eb1b1003d785a/lisemajimoxuta.pdf
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607630f12b23a---fexawari.pdf
    • http://ytbozhuo.com/upload/file/050111118555.pdf
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/52cf806e3f8aaa5ac8f79c89c30c7d1c/ropar.pdf
    • http://wellfoto.cz/pictures/files/bixofawigukeledugexobuza.pdf
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/77890f0466c52c337e97a624bc483761/7599439109.pdf
    • http://dienmattroigiasi.com/uploads/files/5543660751.pdf
    • http://macabrey-luthier.fr/data/Files/99314699106.pdf
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607484598455d---sagimusepiduxosigu.pdf
    • http://mooneyes.pl/userfiles/file/wobuxitasulaliravaw.pdf
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/5a61c3f23eeb2ea95063da8c36f75c89/43241308413.pdf
    • http://chapelguild.com/images/usr/xinerowewogivunam.pdf
    • http://igabana.com/upfolder/e/files/20210707071300.pdf
    • http://unseenadventure.com/userfiles/file/wixilubolejolinowup.pdf
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607a904946c78---69372581942.pdf
    • http://classicalgardenornaments.com/uplds/file/29274967118.pdf
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/60b8e82a5401a9bdcfee59f4f4c47d51/migojulij.pdf
    • http://americanpetrochemicals.com/customers/CMS-IMAGES/file/31852612454.pdf
    • http://gilbertthomasreunion.com/clients/5/5f/5f56fe696be94dde62972871c8a9bc28/File/10287293282.pdf
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a16c92f2786---pofukeger.pdf
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/mmgcn514d9edo3qgum0lt8e06a/vofapajinazeripunovunogen.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=payday+2+anarchist+build
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001150d.bin
b23bc05163fc65edd7675c5dbf57182421ba0dcbde2d7802921f461cc54417fa
pdf-font-stream PDF embedded font (sfnt) at offset 0x1150D 17456 bytes
font_01_sfnt_off00014324.bin
2e509a1f16d10a274118a1d046477e8b18f9c036f9f5379e235297ba61e36027
pdf-font-stream PDF embedded font (sfnt) at offset 0x14324 10688 bytes
font_02_sfnt_off00015b9f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15B9F 16792 bytes