Malicious PDF — malware analysis report

Static analysis result for SHA-256 f76184c6bb69627a…

MALICIOUS

PDF

77.9 KB Created: 2021-09-20 22:18:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 4be56ce10a7305bf3b87c0876130f55e SHA-1: 6bab2c121a815a3cf2fbf18600b37eb88d40bd9f SHA-256: f76184c6bb69627a77c291bcf9b1616e29d5783712b2ef76a8e8a9ee4dfc82c6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external links, some pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution attempt. The embedded JavaScript likely serves to further the malicious aims of the document, potentially by redirecting the user or initiating a download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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 http://marchmontnews.com/imgs/file/46083152350.pdf In PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613f8de38870e---62541410809.pdfIn PDF document text
    • http://happyorderfood.com/uploads/files/luzomudikemo.pdfIn PDF document text
    • http://versobrokers.eu/userfiles/files/35973183134.pdfIn PDF document text
    • https://albizy.com/ckfinder/userfiles/files/pulop.pdfIn PDF document text
    • https://xlspandoek.nl/userfiles/file/64843593289.pdfIn PDF document text
    • http://xfswchem.com/upload/files/48845244562.pdfIn PDF document text
    • http://olguanaokulu.com/upload/file/futed.pdfIn PDF document text
    • http://vibrobreaker.com/files/files/205616806.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.com/upload/files/zijevirodoxapixamuked.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/lerusituzazeveba.pdfIn PDF document text
    • http://olguanaokulu.com/upload/file/xupipi.pdfIn PDF document text
    • http://plncse.hu/php_data/file/53219896250.pdfIn PDF document text
    • http://chiari-web.com/ckfinder/optimist/files/ladakitoziwuwi.pdfIn PDF document text
    • https://guruamardaspublicschool.com/userfiles/files/pigujeseji.pdfIn PDF document text
    • http://conomiya.com/images/uploadedimages/file/notapogizoveluxeji.pdfIn PDF document text
    • https://malinaionescu.ro/userfiles/file/xijoto.pdfIn PDF document text
    • http://lso-msm.com/userfiles/file/kitaxexi.pdfIn PDF document text
    • https://www.bankkartya.hu/js/ckfinder/userfiles/files/xojamilemo.pdfIn PDF document text
    • http://sxsasa.org/images_fck/file/1630643110.pdfIn PDF document text
    • http://studiotravenzolo.it/userfiles/files/47256311457.pdfIn PDF document text
    • http://ecohouse-lab.de/userfiles/file/8769360237.pdfIn PDF document text
    • http://sh-songshi.com/admin/upimg/file///donojokobenarigarexep.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/v3dnoue46j66h2of9qgcic4l56/56073989579.pdfIn PDF document text
    • http://zdravi-kromeriz.cz/files/file/58180503806.pdfIn PDF document text
    • http://www.moyekolodin.com/files/80841080100.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/0ht3gtpem1ui4lm6f7vtj6f124/73009629414.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=left+part+of+tummy+hurtsPDF 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_off0000cd59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD59 10552 bytes
SHA-256: cf6a78919dbf232b7f1377360fce70ecf6a91ec942e76ecc83e3259fd71b28b8
font_01_sfnt_off0000e57b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE57B 17272 bytes
SHA-256: 8c15a700d2f8b13fa701926f3388c5a758e5e7544b935e6fbe7d7a07bc01ac29
font_02_sfnt_off00011237.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11237 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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