Malicious PDF — malware analysis report

Static analysis result for SHA-256 16852d5450564752…

MALICIOUS

PDF

108.1 KB Created: 2021-06-30 10:03:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 7b587dcdc4df02ddd4dceb1c79a43bb5 SHA-1: 2ed5b1b318bbb413464f7b296b890f82addcedb0 SHA-256: 16852d5450564752ba6c18b07fbc81b7c7d054c8a5cc1bc52ec5d84ac563268e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with techniques used to host and distribute second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/f0eb71831478bd9e9459ff6b36bdd635/nigituvuri.pdf In PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/a4tsmraebtd9sv3uirons1u0bq/46073325748.pdfIn PDF document text
    • http://vita24h.com/uploads/userfiles/file/19195987690.pdfIn PDF document text
    • https://jooli.ru/ckfinder/userfiles/files/79284049049.pdfIn PDF document text
    • http://tafgambiatours.com/userfiles/file/vukosidemugoxavakumuz.pdfIn PDF document text
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081e749a85b2---totusonedalivu.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/41658102151.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/44688027768.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/vqnpf84fh949v00416f8c8jes9/84707677441.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a9da264e41f---munelazikawonikoxi.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/517aea407d1cf0c7bc3f9513dbc6d562/teruvarimagudejafogaxevo.pdfIn PDF document text
    • http://xn----8sbxab3abskk3a2j.xn--p1ai/media/file/kesipafawidemonosovutozek.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/066d3dce3a14f896485d0b5da4bc5074/47698116631.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca889f2d23---latevemuredirajami.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/9fc281ea18d9020fdc406028cec0d762/pivusexivejeseb.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/ca024e5f889e33168a0f6af44a2ccad7/1398062657.pdfIn PDF document text
    • https://gute-reise.ru/i/files/files/46200586608.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/nukesojal.pdfIn PDF document text
    • http://stylekd.ru/files/2063575043.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/46fb20c460295886526e8cdec0589625/duluj.pdfIn PDF document text
    • http://hosungtour.com/FileData/ckfinder/files/20210528_0CE4A2F279A211F8.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=permanent+resident+meaningPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010bbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BBF 24656 bytes
SHA-256: 34bc4919180bcb3d6188ea195ad41b3aacd75e846cf1fa7d742d9d40df3d0ce5
font_01_sfnt_off00014772.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14772 10424 bytes
SHA-256: 73d68d38e3a7b3a5c3b95c518c936a12aece31c882369a8790dc7d369e89c8ee
font_02_sfnt_off00015eca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15ECA 5640 bytes
SHA-256: 5460caeb166dba74bb2043b5d899032ec798a5bc3084d319d97c305693a330bd
font_03_sfnt_off0001728c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1728C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off00018a9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18A9D 16672 bytes
SHA-256: 5242b45d40c4282fb1847264bb7cb00275b39d76c1d6e9461705cc46ce85a78d

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