Malicious PDF — malware analysis report

Static analysis result for SHA-256 e21f82f7ddf5cdf6…

MALICIOUS

PDF

91.4 KB Created: 2021-09-03 21:46:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 64d18dbcc14f926bb94fd03bebce305d SHA-1: 7d031b157149a78704b511b5e24f3ca5029333ca SHA-256: e21f82f7ddf5cdf6275fadbdb8f354f33e94011760970524b5644ebde832db64
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 ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://medvor.ru/uplcv?utm_term=musculoskeletal+system+worksheet+answers PDF link annotation
    • http://matchonusa.com/uploads/files/1354253491.pdfIn PDF document text
    • http://ekotronic.eu/files/file/dipow.pdfIn PDF document text
    • http://kodemari.info/data/files/wotovusigodutasuzagogi.pdfIn PDF document text
    • http://sooam.com/files/fckeditor/file/10300972246129cd64eeea9.pdfIn PDF document text
    • https://www.scmsgroup.org/ckfinder/userfiles/files/72427897471.pdfIn PDF document text
    • https://nyirfa.hu/uploads/files/nanagajob.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/25608622148.pdfIn PDF document text
    • https://transport-vehicules.fr/userfiles/file/wesol.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/40977385328.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/c7da3650bd69a8d8da8078219cb43669/85845346760.pdfIn PDF document text
    • http://locum-system.pl/userfiles/file/9717558812.pdfIn PDF document text
    • https://iva-vietnam.com/userfiles/file/gowosigasigagutedejado.pdfIn PDF document text
    • https://alcoolassistance-creuse.net/www/site/js/ckfinder/userfiles/files/mifixewilomenulerenezo.pdfIn PDF document text
    • http://xn--80aesyq.xn--p1acf/files/file/keroperosiwepubero.pdfIn PDF document text
    • http://fobosgrunt.ru/files/ckfinder/files/tavegifoloxuxas.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/37195952717.pdfIn PDF document text
    • http://albertopizzetti.it/userfiles/files/fapoxilob.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160920516483e4---bujemudanodokelu.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/81802039824.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aac61fc27af---zizudapadudukatoka.pdfIn PDF document text
    • http://asbazainville.org/userfiles/file/52625531796.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611504748a3f1---82794618686.pdfIn PDF document text
    • https://securitegenerale.tn/userfiles/file/24204691251.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_off0000fd4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD4F 19600 bytes
SHA-256: 3449b363c5f03cd5ebff555b8c4bad93f1c977b7d9df6ad608c520ef0a72497b
font_01_sfnt_off00012eb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000146d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146D0 10788 bytes
SHA-256: 8e4e9f19ea9aaf31b36410aa9c26bf7f97aa5c8b159795c432de5eac946267c8

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