Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5a0970566d9de59…

MALICIOUS

PDF

85.1 KB Created: 2021-09-12 09:57:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 323aa7813048f1f5ce25649d36935ed8 SHA-1: a85e213566297cad3c655d97fe3f51814309de5e SHA-256: f5a0970566d9de596a345dac123d29bcdacbff1cd179b53f6d059a08c75c2610
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to lure users to external sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The presence of multiple link farm heuristics reinforces the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://bangtaisay.com/uploads/userfiles/file/88616045014.pdf In PDF document text
    • http://cn-daomeng.com/upload/userfiles/files/9659ebd20fe67987711f986508152142.pdfIn PDF document text
    • http://hamzalegalservices.com/userfiles/file/62418790887.pdfIn PDF document text
    • http://de.ruben.pl/ckfinder/userfiles/files/13092142614.pdfIn PDF document text
    • http://www.rannatennis.ee/data/upfiles/files/15375222426.pdfIn PDF document text
    • http://historia-bfured.hu/userfiles/file/dakojivu.pdfIn PDF document text
    • https://apskarota.org/userfiles/file/34015928188.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/5ec600d666f5ae7f17fe4d7091ad13cb/10415045108.pdfIn PDF document text
    • https://www.nhabe.com.vn/ckfinder/userfiles/files/timemarovifunakezofero.pdfIn PDF document text
    • http://czechdidgeridoo.com/admin/upload/file/83364796076.pdfIn PDF document text
    • https://activepymes.com/pub/file/79038127812.pdfIn PDF document text
    • http://remont-etalon.ru/upload/files/29973099229.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/e5dk16afc3skgbnjm72e0tbna0/96244604409.pdfIn PDF document text
    • http://sgpeo.pl/users/file/14790878724.pdfIn PDF document text
    • https://atkarisuli.hu/userfiles/file/jixasakuleve.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/16137f0f79892a---jadexunukizuwojogo.pdfIn PDF document text
    • http://tdbm.vn/upload/files/fusamedakoso.pdfIn PDF document text
    • https://www.carnesvarejo.com.br/assets/ckfinder/core/connector/php/uploads/files/fenujenazadoximofinarudor.pdfIn PDF document text
    • http://elencostruzioni.it/userfiles/files/64357262448.pdfIn PDF document text
    • http://kingbikeonline.com/images/upload/File/gasalopufipux.pdfIn PDF document text
    • http://maxgear.cz/webpagebuilder/ckfinder/userfiles/files/gonazurigudigidutofeb.pdfIn PDF document text
    • http://turatabor.hu/media/ginigu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=gladiator+heroes+clash+fighting+and+strategy+game+mod+apkPDF 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_off0000e44f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE44F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC61 18392 bytes
SHA-256: 801cbdfbfe0942e62f69d02eb24065f582016d781e01c454986361abdfe845cc
font_02_sfnt_off00012bee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BEE 11312 bytes
SHA-256: 1e08eae88229e3e26bcb3608612fe3eb73d64f5a423fd316b4bf2121696e83a8