Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f64407582d1e82a…

MALICIOUS

PDF

86.3 KB Created: 2021-07-04 20:43:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 5b236baf604d40258b614ed60d1a9609 SHA-1: e7bc5469d18c00c1bd76740917e8bffaaf263986 SHA-256: 4f64407582d1e82abb49dd96f8de6a923b357830fe7e1459a95c459d761b48cb
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The file contains a link farm pointing to numerous distinct hosts, many of which appear to be compromised WordPress installations or disposable hosting. The primary purpose seems to be redirecting users to potentially malicious content, such as phishing pages or malware downloads, rather than displaying legitimate information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://knshzj.com/CKEdit/upload/files/66580937893.pdf In PDF document text
    • https://amursvoidom.ru/media/files/guxukomotadopi.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/v20hpbqokqvtorjjulsuotp0vd/dibuwiwo.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609a5676c69b1---80153082253.pdfIn PDF document text
    • https://gites-les-bardots.com/userfiles/file/93717412685.pdfIn PDF document text
    • https://bevillelecomte.ovh/ckfinder/userfiles/files/nelupugifizoxupo.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607526237ea27---narubekazefizani.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/99394676504.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/b8o267edg31b25s4prjt32opgm/rimevewatuvafanibujovuso.pdfIn PDF document text
    • http://marta-galan.com/files/varios/file/jamebakafinokabavoxasifim.pdfIn PDF document text
    • http://csc0516.com/userfiles/file/20210626114552_nd04hv.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/2d1f654c9f64f7067d3773f87edf3b12/85667526595.pdfIn PDF document text
    • http://srividyaastrology.com/userfiles/file/70181113749.pdfIn PDF document text
    • http://bumsnab.ru/uploads/files/ramatoxinexegomibuke.pdfIn PDF document text
    • https://mk-promotions.com/ckfinder/userfiles/files/wigos.pdfIn PDF document text
    • http://atdawnwelift.com/userfiles/file/xewugedan.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/51879728288.pdfIn PDF document text
    • http://3e-recycling.ru/app/webroot/filesfiles/14960715207.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c70d1daa460---sobonunamupirerow.pdfIn PDF document text
    • http://qca.ch/userfiles/file/nagutogube.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed0e991949---6249493716.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/2qhc999k0ftn8foqrkon0n89gt/60040307465.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c44ca1c700b---mutetati.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c66f01b4407---kawotuxivotefasof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=disability+tax+creditPDF 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_off0000eee8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE8 17212 bytes
SHA-256: d3bb6509b80e746a9898e9f5c86a23bb3b4eb50c2d5a0e261cada29f36c41cba
font_01_sfnt_off00011be1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000133f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133F8 10496 bytes
SHA-256: b35ecaf68c95f20ef83bf8e87e1016422903f6dce5a28d6e78c28e6cfe6d1380

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