Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0589cf2df093a81…

MALICIOUS

PDF

82.9 KB Created: 2021-09-01 19:38:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: fa260213eb91b70c2c4ea6d3db186d49 SHA-1: 159725349819fe18f7c066b9002ffd88fbd43f49 SHA-256: f0589cf2df093a81b0a46c050ebfd05b17c746f68ac171530cc9a1dcd7bb3c18
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to numerous other PDF files hosted on compromised websites. Heuristics indicate these are likely disposable hosting or compromised CMS uploads, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/1bb004032acb1f91af25c402688c7851/putawegovaru.pdf In PDF document text
    • http://tano-cable.com/d/files/jafopuzur.pdfIn PDF document text
    • http://aodaibooking.com/FileData/ckfinder/files/20210814_B0E7369F2FFA20AF.pdfIn PDF document text
    • http://studiovalentini.eu/userfiles/files/gukusavedibowopokoro.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/9579612660.pdfIn PDF document text
    • https://vinamex.info/uploads/news_file/6705298127.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/ea09a07a208a7b91fca50fc4d40e9b03/38914024727.pdfIn PDF document text
    • https://gjbuyerbroker.com/userfiles/file/zamipapizubi.pdfIn PDF document text
    • https://livre-d-art.com/ckfinder/userfiles/files/sojenu.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/8bq6iik5jncej0g8pauhu6uon3/13609395539.pdfIn PDF document text
    • http://spain-ex.com/images/blog/file/kovifot.pdfIn PDF document text
    • http://df-foundry.net/d/files/40048587027.pdfIn PDF document text
    • http://rbc-bezorgdiensten.nl/upload/84991540120.pdfIn PDF document text
    • http://risorsaterra.it/userfiles/files/51981412211.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ac775f9df17---nakusutobubunegapex.pdfIn PDF document text
    • http://mn-print.ru/ckfinder/userfiles/files/nosaxufazakamixa.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a896fce7983---78432443395.pdfIn PDF document text
    • http://littlepearlspublishing.in/data/eimages/file/siwetinifitatazigawi.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/rurituwekarelokadomewe.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a0749c496c---bituduwepabadexovelokur.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/38eluba4e6n3msa3a318ce7ip7/sederigofedofizob.pdfIn PDF document text
    • http://ttworld.hu/uploads/content_files/files/22155210430.pdfIn PDF document text
    • http://chobacgiang.net/webroot/img/files/sejesujuni.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=what+does+frogadier+evolve+intoPDF 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_off0000db88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB88 10692 bytes
SHA-256: c1d7ab7b44ce5f96805e2d3ba626bafad84338dc132ecbbf97835ae92a16b427
font_01_sfnt_off0000f3d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010be3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE3 18512 bytes
SHA-256: ca644b2e5682614abda4dcd1f48f974a276fc54d785479ee17a36c561f451063

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