Malicious PDF — malware analysis report

Static analysis result for SHA-256 16c7ae7cd5d4f0d0…

MALICIOUS

PDF

86.3 KB Created: 2021-09-05 23:26:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: dc98101ba26a3d620467724e68622e5e SHA-1: 13506d71e224c80b6c09833aeb219df79502f63d SHA-256: 16c7ae7cd5d4f0d059989b462bb73d3ea2af3e654abd7609fbcce9bba9890960
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, hosting numerous links on compromised websites that point to other PDF files. These links are designed to lure users into clicking them, potentially leading to further malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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.
  • 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://ajur.rest/uploads/userfiles/file/rebukazinazabapepunofanat.pdf In PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16085ea32a7503---29645575714.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/zulefab.pdfIn PDF document text
    • http://www.grupoaccs.net/ckfinder/userfiles/files/8881962715.pdfIn PDF document text
    • http://yummyschool.com/_UploadFile/Images/file/7512720546.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c132d7b24b7---makokog.pdfIn PDF document text
    • http://etkindenetim.com/resimler/files/siwimibojapise.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/kexuvanobeduxepupug.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7e5a1d057---83849001515.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/77332301073.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1611fe74c39b83---10887123602.pdfIn PDF document text
    • https://ciela13.leaddeehub.com/userfiles/files/bajasapasovaka.pdfIn PDF document text
    • http://biotop-zamosc.pl/userfiles/file/41145981194.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d11b265835---41649205372.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160866f11d80da---54600771864.pdfIn PDF document text
    • https://arhometutor.com/userfiles/file/wapumi.pdfIn PDF document text
    • http://melabo.com/upload/files/bumifunes.pdfIn PDF document text
    • https://cncostruzioni.com/userfiles/file/41233063259.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/v3hr2ej9pv6ej4ae18hq4o13fb/rosijijajexijopunofoduxe.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ffb5c669ee---92200731126.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/vmcufqtt25uoq29eaec2omrocd/51012864941.pdfIn PDF document text
    • http://nceed.kr/pds/userfiles/files/simawuzapatetanezuvoraf.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/ffcm357qlndg1b9pk7ju4robc1/kelujigesuwojazute.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=shoulder+pain+treatment+exercises+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_off0000edeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDEB 16808 bytes
SHA-256: e41a19f8e302b2aabb3ab0a3336b3d0895084e396d42011f941f4084db31f98c
font_01_sfnt_off0001195d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1195D 11164 bytes
SHA-256: 3552359bf05d448412b8c1b869dd3ba376244009226dc144bbb10a9bb529bb34
font_02_sfnt_off00013341.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13341 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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