Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fbe616a7ef99223…

MALICIOUS

PDF

84.8 KB Created: 2021-10-04 20:25:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c62bc72af341ee427a8bbe81a9b0dc01 SHA-1: 0a9338d3577feff1ed250268cf1f6ca9d3a9c20c SHA-256: 9fbe616a7ef9922330a51fff7c98340aa98c59192bf2ce7843c76d329f0be89d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many embedded URLs pointing to compromised WordPress uploads and other disposable hosting. While no scripts were explicitly extracted, the PDF structure and link farm behavior strongly suggest an intent to redirect users to malicious sites for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://candybeauty.vn/upload/files/xowiwevikefe.pdf In PDF document text
    • http://dianacb.cz/userfiles/file/fukomufulunaloge.pdfIn PDF document text
    • http://tmkb.org.tr/ckfinder/userfiles/files/3985257356.pdfIn PDF document text
    • http://riverside-plaza.com/upload/userfile/files/97386270790.pdfIn PDF document text
    • http://salsainkonstanz.de/media/files/zademazugadanu.pdfIn PDF document text
    • http://dubilex.com/userfiles/files/95185263565.pdfIn PDF document text
    • http://thietbikhachsanvinhhung1.com/upload/files/87594406200.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/161556b7ab98ab---98119494821.pdfIn PDF document text
    • http://otworz-biuro-podrozy.pl/userfiles/file/firebozezujosokafibinulix.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/kixulinakal.pdfIn PDF document text
    • http://leguido.net/files/82511076511.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/161532c107673a---38178687451.pdfIn PDF document text
    • https://khogiaydantuonghanquoc.com/images/news/file/76410812927.pdfIn PDF document text
    • https://agriplan-rs.com/dados/ckfinder/files/budatizomozulusukav.pdfIn PDF document text
    • https://cowik.pl/upload/40299864663.pdfIn PDF document text
    • http://goldenpeak.it/userfiles/files/gigamuzebuforidavewumu.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161435f3454400---85314572051.pdfIn PDF document text
    • https://www.notusweb.com.br/ckeditor/ckfinder/userfiles/files/bixeruxugujifiwawexetigim.pdfIn PDF document text
    • http://kamkmori.cz/ckfinder/userfiles/files/wimatonunifalegufarerog.pdfIn PDF document text
    • https://shinko-tw.com/UserFiles/file/gazigelorekanekab.pdfIn PDF document text
    • http://paulabenveniste.com/UserFiles/file/zasenezufizozewegi.pdfIn PDF document text
    • https://commonwealthsportsawards.com/userfiles/file/24687618300.pdfIn PDF document text
    • http://uralinteh.com/uploads/files/busogeruve.pdfIn PDF document text
    • https://coombs.gocascadia.com/images/cms/file/rijaxexedamama.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/bbdhskr1shbs5h6msflhs0hqh5/gamawofo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=considerably+meaning+in+englishPDF link annotation
    • http://alessandrotria.altervista.org/areap/ckfinder/userfiles/files/1696654060.pdfIn PDF document text
    • 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_off0000d676.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD676 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE8D 10880 bytes
SHA-256: e4223a60fcb4bd6471fb88eb558dacdb79ee31d935a6aae26a847118ef7c363d
font_02_sfnt_off0001074b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1074B 24052 bytes
SHA-256: 004bfb03201818cc92646210ea663ac69f80fd3c21b9743efde66b4ee68f8ca3