Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd2581c0633da10c…

MALICIOUS

PDF

78.1 KB Created: 2021-09-05 08:53:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8359d5392e68bc538c851b0355c2f262 SHA-1: 719e99daead8a069e718e09554d867875ece5ede SHA-256: dd2581c0633da10ce80bc14c181aae929b7c6647ea5aa861b83a54fd342e4329
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. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit PDF vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://inwebjor.ru/uplcv?utm_term=plant+saponins+pdf PDF link annotation
    • http://ecandrychow.pl/Image/files/tefunilexinipugazatoxatu.pdfIn PDF document text
    • http://resheto.ru/users_images/fck/file/tobawujume.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/j1eo45akuf8dpknd8u4oucqgjc/dugoxi.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/76819234477.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8c08d94a1---pituzibu.pdfIn PDF document text
    • http://446888.top/userfiles/file/mukogogaxatiguf.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/62164199984.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/161201521d0b52---34480642892.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fbb6be19f8---67986422695.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613023d8a3cef---55764519611.pdfIn PDF document text
    • https://deltagroup.bg/uploads/file/felatobaba.pdfIn PDF document text
    • https://pelicanfinancialnetwork.com/ckfinder/userfiles/files/fowateg.pdfIn PDF document text
    • http://pitin-akutsu.com/js/upload/files/40875398099.pdfIn PDF document text
    • https://norservis.cz/files/files/23186661877.pdfIn PDF document text
    • http://tvoirostov.ru/ckfinder/userfiles/files/4455697376.pdfIn PDF document text
    • https://paymentor.nl/uploads//file/70077182991.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/c0a63f91b7fcd65b1d9c31f9f1dc9076/fuzelemadata.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/valeduxixovarujizojunesi.pdfIn PDF document text
    • http://inspirationforexcellence.com/clients/66491/File/93271004713.pdfIn PDF document text
    • https://textolinguisticsolutions.com/upload/editor/file/37335612765.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b876e1b479---44313290276.pdfIn PDF document text
    • http://cuanhuaabshanquoc.vn/files/wulabikezafupujod.pdfIn PDF document text
    • http://mobilenmr.com/files/files/36614042920.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/zimowizajufoselame.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ac01f6cd2a1---mazazupujupevupajesomer.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b7380c76603---35137376901.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_off0000cd2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD2D 17732 bytes
SHA-256: 06edbc75884db8810f8b3a4bd8ad65677ca92946b0b04666e967ed934d678cae
font_01_sfnt_off0000fb53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB53 10260 bytes
SHA-256: 9ed47a424689d9a44d0c08f9af03f2e222135d44d1245585d8d9364c7e31fb47
font_02_sfnt_off0001127d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1127D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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