Malicious PDF — malware analysis report

Static analysis result for SHA-256 958873359a4aaa54…

MALICIOUS

PDF

83.3 KB Created: 2021-09-03 21:22:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 846a4e871cd2d15ddffdbc21d12f3ed0 SHA-1: c939e71f2f7c815f1b97eb02794d92e5b8614b7b SHA-256: 958873359a4aaa548eaff1dfffb97c307ff6b7dbc61ba49490c4da4138362ead
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to distribute further payloads or phish users. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure points to a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/46e809281fabc62516257f6cdc76cd67/sinafeviva.pdf In PDF document text
    • http://fujavietnam.com/images/Download/keboforupaviw.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/68519591761.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6247ada3c1---xagapamexodijedijo.pdfIn PDF document text
    • https://vydavatelstvoklett.sk/userfiles/file/75349262708.pdfIn PDF document text
    • http://rotarylaspalmas.orgdocumentos/file/95764271045.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160722ac17d3bc---gupox.pdfIn PDF document text
    • https://chulintemple.org/CKEdit/upload/files/6264913822.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/64041806217.pdfIn PDF document text
    • http://sp3siemianowice.pl/userFiles/files/86575617548.pdfIn PDF document text
    • https://hostingyuvasi.com/calisma2/files/uploads/zuvofaxetojuzewo.pdfIn PDF document text
    • https://yodishit.com/uploads/userfiles/file/55260050760.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607373066fc3e---mowerojotodam.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b29edd995aa---matokibefad.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160af918da079d---mojigisagetamajato.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/23780666678.pdfIn PDF document text
    • https://evermoral.hk/upload/file/1624831073.pdfIn PDF document text
    • http://labcoop-jsc.com/wp-content/plugins/super-forms/uploads/php/files/b4qbrhk8len72q2nmtvfof560t/nedavamemupijarokisor.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608552f57a430---55142653314.pdfIn PDF document text
    • https://matrainagycsalados.hu/userfiles/file/57655079320.pdfIn PDF document text
    • http://ltmetal.com/userfiles/files/24176984788.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f32563189---76675478973.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/5226ea803e61061776dc75d1c0bb6679/lulopovoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=survey+summary+report+pdfPDF 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_off0000e1ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1AB 10772 bytes
SHA-256: 552d422a64d95a3c3b707cf374058ff89b6b5e478bcdc05d9d7b713f8fc7eb05
font_01_sfnt_off0000fa8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA8C 17252 bytes
SHA-256: 181bda8d39a3da80eecb9806604e30cc7215ff41334cb91c1f233a491701e06b
font_02_sfnt_off000127c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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