Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6c8a28df821efc4…

MALICIOUS

PDF

73.5 KB Created: 2021-09-05 03:12:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2a935c2c3356ea61a27f64fb5b18dd0a SHA-1: aed227347a465a15365061102be46f1df4f4603d SHA-256: d6c8a28df821efc47a68a4cbe93bbf807786f6696fc5fedc51984917b95b8cac
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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.
  • 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 https://nomylo.ru/uplcv?utm_term=digraph+practice+worksheets PDF link annotation
    • http://nitexprofi.cz/userfiles/file/5576743637.pdfIn PDF document text
    • http://stoka-saarlouis.de/userfiles/file/suwava.pdfIn PDF document text
    • https://ceral.pl/ceral/pliki/file/dipidowuruduba.pdfIn PDF document text
    • https://cpsguffanti.com/uploads/file/bawisilatoxukedusak.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608930af5d730---99141317429.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/c5af2106b6d63c0f2fbf08959df2bed6/ludapatitesowokijedi.pdfIn PDF document text
    • http://kaies.net/upfiles/210816170206412726m7wgvx.pdfIn PDF document text
    • https://dgaspcsm.ro/ckfinder/userfiles/files/25607735745.pdfIn PDF document text
    • http://cityclick.it/userfiles/files/diwibe.pdfIn PDF document text
    • http://fantalife.nl/userfiles/file/sapuvebosesopuvud.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad4b319c5ca---37507113768.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e03a5208b---jomukakutogozilixofat.pdfIn PDF document text
    • https://oklasik.com/ckfinder/userfiles/files/vosobazuretavafip.pdfIn PDF document text
    • http://xn--54-dlcdkamdj4btild5b.xn--p1ai/ckfinder/userfiles/files/jasanokalopokikuvipixe.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/8f77375955da948a046864d176c4920f/paxeliwawix.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/55461898356.pdfIn PDF document text
    • http://ekorob.pl/userfiles/file/dabakirumefabaxosin.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16072e25bf0b66---serezezaxubalibikere.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/dcbb2fed3704ed5b0851f8bc79981a95/98947946592.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16103ed0363839---dugagovuvidivo.pdfIn PDF document text
    • http://jubileejec.com/userfiles/files/54701618444.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b04d46f1e5b---fazeb.pdfIn PDF document text
    • http://tomei4x4.jp/js/upload/files/zifazodobi.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_off0000bcaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d4bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4BC 16388 bytes
SHA-256: b6478d432bc48729e99b539f886db10c68f1724e9d73c16216390b5790c4c0b3
font_02_sfnt_off0000ff51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF51 10684 bytes
SHA-256: 40bd51a2b4c23b2ddc9586f7400e23ea154c3d8a9e558c3cafc6be79d3f9860e

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