Malicious PDF — malware analysis report

Static analysis result for SHA-256 590f21f9c5ee80a5…

MALICIOUS

PDF

84.4 KB Created: 2021-09-02 07:02:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 22ea110f695b6a03bb480143f6716b3a SHA-1: 95c5e272df445d3dc42553a42c8826ca3303b403 SHA-256: 590f21f9c5ee80a5b60e3efab32711062398643dce6ecf69d7515686bc8e9ec8
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, forming a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery via these links. The embedded JavaScript is a common technique for obfuscating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://smidgel.ru/uplcv?utm_term=actuarial+analyst+meaning PDF link annotation
    • https://aquafilling.com/userfiles/file/pijexixapod.pdfIn PDF document text
    • http://insidethedigitaltrend.biz/userfiles/file/pulavezazupinotopa.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e5136f7d65f---sifotokojozopanamifatox.pdfIn PDF document text
    • http://ehomerealestate.org/images/file/22170533162.pdfIn PDF document text
    • http://pokewaveanaheim.com/uploads/files/61149009518.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081023865758---61295372483.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9a9afc7d01---wologomagisor.pdfIn PDF document text
    • http://hagelkonzept.de/userfiles/file/magabunato.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a52223d4ade---vujuzulegizikedidovu.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-17/20210517122930622242.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/pgjhepkmc29ins212efs1aqmdt/fofani.pdfIn PDF document text
    • http://2m-m.eu/userfiles/files/nuteriwu.pdfIn PDF document text
    • http://ifa-astrologie.de/userfiles/file/vedubo.pdfIn PDF document text
    • http://dentalclinicbangalore.com/uploads/parixo.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/mavopadi.pdfIn PDF document text
    • https://konferencii.ru/js/ckfinder/userfiles/files/jobam.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/7kbh71guan80dadd8elpp7t7j8/16119844184.pdfIn PDF document text
    • http://krakow4you.pl/krakow/files/80852992126.pdfIn PDF document text
    • http://e-sportis.com/images/upload/96813331576.pdfIn PDF document text
    • http://beijinghuojia.cn/userfiles/file/1813211675.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082ec9d967c5---metotipekejivufagatanizos.pdfIn PDF document text
    • http://longchimvac.net/app/webroot/uploads/files/zamofiretitanoperuzerat.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/23233767980.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_off0000e80a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE80A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001001c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1001C 16756 bytes
SHA-256: 618e8746590ece0786a9317e7034e96e08d3429d11c8710de462d73f8bc7028e
font_02_sfnt_off00012bc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BC9 10648 bytes
SHA-256: eff2c63f569ba611cab1858abedec0830f992d237e4cbc2e54a05fde133166da

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