Malicious PDF — malware analysis report

Static analysis result for SHA-256 aefdd13fae3a9d65…

MALICIOUS

PDF

87.0 KB Created: 2021-09-10 14:05:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8bbdd21e8b72ce121536198e4c023864 SHA-1: c0eee62a93743fed6909e4184b7ba29f58673782 SHA-256: aefdd13fae3a9d653765622916238ccda0560548f7273fcd6fd2e5728e65a8e9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to various domains, many of which are identified as part of a link farm hosted on compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL analysis and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://regcureguide.com/files/files/fuzafavazen.pdf In PDF document text
    • https://thehouseconcert.com/ckfinder/userfiles/files/56779361323.pdfIn PDF document text
    • http://sun-green.be/ckfinder/userfiles/files/33916453057.pdfIn PDF document text
    • http://bluelakehomestay.com/uploads/image/files/gebonusuv.pdfIn PDF document text
    • https://psg66.ru/admin/ckfinder/userfiles/files/4585657919.pdfIn PDF document text
    • http://xsjprinter.com/d/files/2769849469.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/zawewosuvetod.pdfIn PDF document text
    • http://jan-fotografie.nl/upload/files/nabariwumilutiwefosa.pdfIn PDF document text
    • https://francemonde.news/UserFiles/file/tusupikuritazofaruki.pdfIn PDF document text
    • http://galeriejacqueselbaz.com/userfiles/file/sifiwuwusewegod.pdfIn PDF document text
    • https://kottayammedicalcollege.org/CMS/ckfinder/userfiles/files/85879853866.pdfIn PDF document text
    • http://grandviewgroupresort.com/upload/files/jotalalubesikivuximala.pdfIn PDF document text
    • http://vzwsportenmuziek.com/content_docs/sabixawinomaze.pdfIn PDF document text
    • http://ysh.my/userfiles/file/49629771009.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161395e90d5ccf---ruxurebuwaminexeno.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/0490qp80ou60pr8e2oioimtnsl/roxilavubabudozuvekisa.pdfIn PDF document text
    • http://tokyosushilohaus.com/uploads/files/jozipumez.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/641bfd182a86efe8811ddbbd019f2088/4204241208.pdfIn PDF document text
    • http://www.enredmail.com/templates/files/idCliente_/file/buzubegulogajije.pdfIn PDF document text
    • http://gitishahjahanpur.org/ckfinder/userfiles/files/lijevujebalovokubaz.pdfIn PDF document text
    • http://uteambio.com/upload/files/14662286694.pdfIn PDF document text
    • http://maksimetall.ru/files/gemudunasifumokasefijas.pdfIn PDF document text
    • http://hongsung114.com/files/fckeditor/file/xetepo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=cara+mematikan+pop+up+blocker+di+hp+androidPDF 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_off0000f063.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF063 10972 bytes
SHA-256: 650b03b375e45e4877f6fe0d548eb8f33197b5715aba48d3a870a0f2921a6544
font_01_sfnt_off0001095b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1095B 17652 bytes
SHA-256: 7102e21fbb5419fd11cb2b2b7c38baefa73c126c3706f1060d7cb0e6a57c14d5
font_02_sfnt_off000136d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1