Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0f3fe7c72008cd3…

MALICIOUS

PDF

83.9 KB Created: 2021-09-12 00:16:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4c7496751b9771d744269260312437bf SHA-1: 1049c11187c72c0ec2f7948b3c4b614965450541 SHA-256: c0f3fe7c72008cd345b96cec96a58d9ec85be441a99c67b3873133314f799476
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms the nature of the links as being on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://anglarill.net/userfiles/file/puvolenoripuzikiworikigen.pdf In PDF document text
    • http://olguanaokulu.com/upload/file/72252474258.pdfIn PDF document text
    • http://vagtteam.dk/userfiles/Files/rutusojigafabipukunan.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/89c00b8f46604aa4825d6b34d28f4bd0/75440824962.pdfIn PDF document text
    • http://agro-vostok.ru/userfiles/file/33705360363.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/1fd1d5295e91a6402a7548cc7d30be0c/divifemuxonulagefeg.pdfIn PDF document text
    • https://dgssu.com/upfolder/e/files/20210908004944.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/9ca11585acb87854641ad12787f5d8ad/gavifawutedipibulijofalex.pdfIn PDF document text
    • https://rezilta.com/psum/admin/userfiles/file/tozedebo.pdfIn PDF document text
    • http://weforyou.it/userfiles/files/52842301160.pdfIn PDF document text
    • https://rugsdirect4u.com/uploadedfiles/file/15853528060.pdfIn PDF document text
    • http://club-integra.ru/userfiles/file/84482057094.pdfIn PDF document text
    • http://cybernet.asia/UserFiles/File/82903389283.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/16135d6c0d89cf---nobolodibovagixator.pdfIn PDF document text
    • http://hoangduy.vn/vn/files/reguvusovubozowabebaf.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/41685017302.pdfIn PDF document text
    • https://maintogelonline.info/contents/files/puposerixufagekulesozebuv.pdfIn PDF document text
    • https://alhasooncorp.com/Files/files/853907590.pdfIn PDF document text
    • http://tao-oita.com/admin/upload_filesfile/64584772206.pdfIn PDF document text
    • http://klick-tipp.at/ckfinder/userfiles/publics/files/bumezuliwagikubulibiwi.pdfIn PDF document text
    • http://kinel-hunter.ru/upfiles/file/2185521130.pdfIn PDF document text
    • http://dienlanhhuubinh.com/upload/files/zidobozibil.pdfIn PDF document text
    • https://megacook.pt/site/upload/file/pufuzubamubovoli.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=d%26d+3.0+pdfPDF 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_off0000da40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f256.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF256 9076 bytes
SHA-256: f695977626623e59fedb2fbedebd468d0acf89ff6f6ceafeb3cee4351ddee6c8
font_02_sfnt_off000104f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F7 23444 bytes
SHA-256: db69c0c2d32621fd7c582c60954191cdb2a996f3c0036fbe8e8b0a90f8900ae1