Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0c04e07aa7ae717…

MALICIOUS

PDF

77.3 KB Created: 2021-07-08 01:08:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 5e1c46d18da88ae2d52130a50f48a059 SHA-1: a0dff5c6c6b7b14683bca0b44b5807640f68d46c SHA-256: b0c04e07aa7ae717e91b9ead4c3b5109cb21f0f22606bddd96884ad97021446d
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many pointing to compromised WordPress sites and disposable hosting, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were directly extracted, the nature of the embedded links and the PDF structure suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://nomylo.ru/uplcv?utm_term=can+i+get+a+hand+clap PDF link annotation
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085567cad797---segijejababodefu.pdfIn PDF document text
    • http://gyndoktors.de/ckfinder/userfiles/files/36218587413.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160750676c1735---letavurimo.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608f0b45abc14---82840572207.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d553b9192b---kezerem.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608ced7f195db---98468335850.pdfIn PDF document text
    • http://bungefamily.com/clients/5233/File/dagur.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/rujinevolodowuzodi.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077683b7517d---27683704674.pdfIn PDF document text
    • http://capital96.com/userfiles/file/11776374413.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/bmn5e6rg0qsvcho8s72h69pcv3/66728859323.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/9c4f33d63da06f9186e487966e4d611a/49615637668.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160cb82cf784a4---jexamizeperiwur.pdfIn PDF document text
    • http://cancercareresearch.com/userfiles/file/88532505002.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210625050150036.pdfIn PDF document text
    • http://klccpa.com/userfiles/file/5607866053.pdfIn PDF document text
    • https://encoregallery.us/wp-content/plugins/super-forms/uploads/php/files/f922336884579358ef5392229230a47e/46166535941.pdfIn PDF document text
    • http://portalpr-b2b.es/img/user///file/_0242453001624522929.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/bd3a02a0946f91c0d58b4874b0ee3ac8/xotawopaliganalul.pdfIn PDF document text
    • https://rajaunited.com/contents//files/tupodamipiwapi.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b33a0b28178---93541669385.pdfIn PDF document text
    • http://appletechsolutions.com/userfiles/file/23696328346.pdfIn PDF document text
    • http://parquessolaresdenavarra.com/userfiles/files/pamiwesoniwimugowupoxobaw.pdfIn PDF document text
    • http://eurolocal.info/sites/default/files/images/file/67392854145.pdfIn PDF document text
    • http://rheumatology.institute/upload/content/file/jasoxe.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///lugariwosimogirowo.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8f77852ff---dilemex.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_off0000cc0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC0D 16988 bytes
SHA-256: 4963e80888093bdfa8ad7b2d7a5c13e23a64bb3e12339a9b6bf30c74e667cc5c
font_01_sfnt_off0000f884.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF884 10436 bytes
SHA-256: d3a5be5aad22894488e0abef95108ce439d377b5ad4e7d8416dc847721a7946b
font_02_sfnt_off00010fe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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