Malicious PDF — malware analysis report

Static analysis result for SHA-256 c474b6885aca9f16…

MALICIOUS

PDF

81.7 KB Created: 2021-09-02 21:28:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1c8384a165429775f57a55bad94246cf SHA-1: d3c0ad4bc74d36b181e1d4a40d4b12cc579c08fc SHA-256: c474b6885aca9f16aaa9559696c43b94c6686356bc945be8d446f37812b0cd84
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. Heuristics indicate it is part of a link farm, with multiple URLs pointing to potentially compromised or disposable hosting. ClamAV detection and ML classification strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://firegallery.ru/img/upload/60002422877.pdf In PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/34b543c69cf2919625b79241c22c6a4d/16592029402.pdfIn PDF document text
    • https://nffcd.org/userfiles/files/42758061475.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609487ce813f3---99852459348.pdfIn PDF document text
    • https://nhathuydesign.com/wp-content/plugins/super-forms/uploads/php/files/escjakmqnt4t4j2vulgg58f1aa/41005319490.pdfIn PDF document text
    • http://kingsauto-bar.com/js/upload/files/40872405704.pdfIn PDF document text
    • http://limuzine.md/userfiles/file/sipetumurozu.pdfIn PDF document text
    • https://queensflower.nl/clientfiles/996819157.pdfIn PDF document text
    • http://etkindenetim.com/resimler/files/57158022853.pdfIn PDF document text
    • http://krukaiart.com/userfiles/files/82819524827.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/kosevesofabuwot.pdfIn PDF document text
    • https://cristalparkhotel.com/ckfinder/userfiles/files/juwufekusefonozusetotarov.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/leruwiraberoxizozagofovur.pdfIn PDF document text
    • https://srilangkapools.com/contents//files/81296021437.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///34991849245.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c984985dfd9---rexuvedimi.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/075527765035f7d8bc915d8f5cad4db2/26776160708.pdfIn PDF document text
    • http://gerocuki.hu/user/file/93738698385.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/ribusigawasopedegogudosuw.pdfIn PDF document text
    • http://logtech.cz/foto/Image/file/57502897495.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/05b2656fe23cad0250c69860189c2b4f/wapijadavikakivodebeseka.pdfIn PDF document text
    • https://beyondpins.com/calisma2/files/uploads/sawizisatuz.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/0id45s08d2d0ge6l99at19qd67/2260795246.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/o01fs3uc8ouskt8h9q090r63l5/82888862604.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=kakanin+recipe+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_off0000ddf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF8 16892 bytes
SHA-256: b86527ce800c69cfafb26be9f62841c01f406cab387c3f7048ff76d34ffbca7a
font_01_sfnt_off000109cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109CD 10264 bytes
SHA-256: cf8f8a3e5133a2c3e82079f5fac81b872303c37e928bbe979db2b18b2db4d052
font_02_sfnt_off000120f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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