Malicious PDF — malware analysis report

Static analysis result for SHA-256 17a239ee1c505fa8…

MALICIOUS

PDF

87.9 KB Created: 2021-08-21 06:16:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: c4cad225f309d1c7864fc0d577c7e2a6 SHA-1: c072c01388c669a5b2f48502485381be423ddcd3 SHA-256: 17a239ee1c505fa86667e8abb3289089828cea5d15f95ec06024a875574e17b1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links to external websites, many hosted on compromised CMS uploads or disposable domains, suggesting a link farm or SEO manipulation tactic. The document body is heavily obfuscated and unreadable, but the presence of external links and the overall detection profile point towards an attempt to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/hu8ckfdt6pp2dk13s07qbfkigl/pajanilewewajakimiwo.pdf In PDF document text
    • http://x-site.by/upload/editor/files/dilesexizupapowi.pdfIn PDF document text
    • http://brianhaymore.com/images/e/file/tabobavubusitowojilo.pdfIn PDF document text
    • http://redemaisfarma.com/userfiles/file/gikulogelizan.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/73510769051.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/2f67b6c3645e84167386722d4ed03d5b/83773687961.pdfIn PDF document text
    • https://flardochform.se/userfiles/file/luvuregojenesem.pdfIn PDF document text
    • http://bhttourist.com/upload/fckimagesfile/21467418945.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f54dddb2b93---xodenaxamotedujizokizeni.pdfIn PDF document text
    • https://uleiuri.ro/userfiles/file/22322892065.pdfIn PDF document text
    • http://maciejabramowicz.pl/upload/files/file/12446585632.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/savivakijemexowitam.pdfIn PDF document text
    • http://mprime.net/ckfinder/userfiles/files/tanowosafadulu.pdfIn PDF document text
    • https://georeno.ca/userfiles/files/zitagizarakadenapu.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/456234fe7ffe02b30db8e95396a53210/ladugusolupaj.pdfIn PDF document text
    • http://kunjipsc.com/uploads/files/woweduguterokikuviwo.pdfIn PDF document text
    • http://eternoohydro.com/d/files/dunesakuvijinogoloxi.pdfIn PDF document text
    • http://manavpublicschool.org/manav/userfiles/file/tedurukobidax.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/160920e738fdd8---28882792666.pdfIn PDF document text
    • http://adhdesign.de/userContent/files/20210801000917-57781466100.pdfIn PDF document text
    • http://ac-kenigsberg.ru/files/file/56181490418.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/dfb2267aabd0c03e4c5c679e02f860d2/43124365200.pdfIn PDF document text
    • http://jfac.kr/ckfinder/userfiles/files/25616381893.pdfIn PDF document text
    • https://www.lashharmony.co.uk/wp-content/plugins/super-forms/uploads/php/files/ndgd082tl6tvqi2292u3ri9494/xarumipizewaf.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/ivkbr1qjla6l8biur07vktgqvv/35028593823.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b25c39277e0---gukisivoleremiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+fix+your+grandfather+clockPDF 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_off0000f29b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF29B 17192 bytes
SHA-256: a7e879d20a4e54a35f71aaeea9b3e4d4f8ce342a017961976e7df099ab179ae0
font_01_sfnt_off00011fb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FB2 11072 bytes
SHA-256: e548c973bd63da130f891dd9f028c79cb63b447b55eba62447fd31e7fb6eae85
font_02_sfnt_off00013944.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13944 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1