Malicious PDF — malware analysis report

Static analysis result for SHA-256 39720de906f235a0…

MALICIOUS

PDF

83.4 KB Created: 2021-09-06 07:46:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ec9ae52c73639932b147ccc0b4b6332d SHA-1: d13b0fd9a684720841ad5fd8dbf32b8d85d316b5 SHA-256: 39720de906f235a0ef5a279d22b692d74e1af2c54cfb035b91f703d52d994c57
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that form a link farm, with several pointing to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The primary attack pattern involves luring users to click on these links, which are hosted on potentially compromised or disposable domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://chcial.ru/uplcv?utm_term=pengertian+posyandu+pdf PDF link annotation
    • http://northstarbaptisttyler.com/clients/a/a4/a4b4c2e389351fb2dee96c3f727c6a57/File/50079159494.pdfIn PDF document text
    • http://hangnhatbanonline.com/upload/files/fejasonaj.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609843a569285---xisemopivefavegubinadem.pdfIn PDF document text
    • http://thekreativecompany.com/uploaded_files/userfiles/files/21282531956.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/36b8f739fb40e5397fdf6714b40ae828/lexosi.pdfIn PDF document text
    • http://skpizzasubs.com/uploads/files/89305854460.pdfIn PDF document text
    • https://penmypoem.com/new/admin/uploadfiles/file/joxuzoxamekexewok.pdfIn PDF document text
    • http://tksvolga.ru/userfiles/file/8154504005.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/579e18330f95bf8be766933f3f6a3190/wafukamodopoxavujo.pdfIn PDF document text
    • http://vhshf.de/File/dexifokilodov.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611ad4d469afd---bijabirisetofo.pdfIn PDF document text
    • http://saxonrt.hu/img/userfiles/files/fibedujumujef.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ad022ad2cb4---27089157789.pdfIn PDF document text
    • http://bigband-ulm.de/userfiles/files/pekawarutixojinovo.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607309b9852ca---50145052329.pdfIn PDF document text
    • http://domoticasociale.it/immaginiNewsletter/file/17846494778.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/8omjbfj5fcnidv05kj3vj8882e/kotok.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16128d11f2a34d---2156588676.pdfIn PDF document text
    • https://paymentor.nl/uploads/file/rakimupudiwapujapupuka.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4033fabadc---bogawiwavame.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095b786808d9---fubisevo.pdfIn PDF document text
    • https://albizy.com/ckfinder/userfiles/files/34910268020.pdfIn PDF document text
    • http://obchodsezlatem.cz/upload/files/39414159020.pdfIn PDF document text
    • https://argentinaproduct.com/ckfinder/userfiles/files/71937299581.pdfIn PDF document text
    • https://paradigma.bg/uf/file/90741121457.pdfIn PDF document text
    • 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_off0000e2f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F1 10840 bytes
SHA-256: 03fe8ab0fbc68ec20e40fa27631b1aac84e373663fb9a54c0ce3995201f5d5e6
font_01_sfnt_off0000fbec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBEC 16896 bytes
SHA-256: 711f77263627efaa1e12fa115a48fb3cdde98dd00bf9d9368eed089c9ddd2ff2
font_02_sfnt_off000127b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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