Malicious PDF — malware analysis report

Static analysis result for SHA-256 a87be0c9e73d5b45…

MALICIOUS

PDF

91.3 KB Created: 2021-06-19 01:31:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 4064c5707252184758111b88c4f392c8 SHA-1: 01489b4bf23b4e1d2daf4ab279ac8ea55ef04ebf SHA-256: a87be0c9e73d5b456c30522eff9135ea9a71dca375d529b33515eb4029948d12
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/41682987060a242c63c707.pdf In PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086bc56669a6---toliwalafizagixeg.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/1httf87qtpugaq76vmja1qitd4/77831887828.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/9c016699aa59bf7b2f12f9e9fed4f05f/jajabarexutefivumajopon.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/8a7d97019c363c729c471b87e2ce2bd5/wukad.pdfIn PDF document text
    • https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/237193d4fcb4c23f7f9a7fdfb2b41c3c/wizuvokulodutumapafaxawi.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b8bfd761a---mopozozumafivogakadaga.pdfIn PDF document text
    • http://www.uniformsolutionsforyou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d84a5bb1ff---ruwajif.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/mf11csc6vl1b043ts4bjpeutck/65195421070.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f59126bd8d---63566414232.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16071313253a1e---kotilifopomalun.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/388f8811cdf524132c22c0ada0bb730f/40204900529.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cae3e22eff---75656205594.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/1299cba055459d545179dc30242485bd/tupajewukividoj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=simpsons+scientific+method+answersPDF 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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6FE 6416 bytes
SHA-256: 528d1e79c27aec131c2cbf846536b85f4c117e3725d0fa982f5a85159cdab222
font_01_sfnt_off0000e6d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D0 5560 bytes
SHA-256: 4cbacffdd4a9625b997825c7a70fd2c21596ede6efa1918730df26e4b0e03561
font_02_sfnt_off0000f99c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF99C 10868 bytes
SHA-256: d4d320fe03427a94025a741be28aca0c32afdafd2549677c933dd6840be1a5ef
font_03_sfnt_off00011c64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C64 11072 bytes
SHA-256: 4b116532d734e71d18fccaebe826c80f9086fc22e0fa54072ec23cb20aa1c6a5
font_04_sfnt_off00014230.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14230 16256 bytes
SHA-256: 8cc6bcc2cf3defe0a88aedbd81e1c3d6ddceaf294630c8a268e5b6d92b2eedfb
font_05_sfnt_off0001578d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1578D 1736 bytes
SHA-256: 0d9b6ab0354368cdfa5a4e52e4dfb250ede80cec4283e48fafec0a3c1c1d30df

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