Malicious PDF — malware analysis report

Static analysis result for SHA-256 4034035b44d0756e…

MALICIOUS

PDF

136.8 KB Created: 2021-09-05 10:09:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 38a172ed53af5b03a400cd3b03f6fab9 SHA-1: 526adeeb2dfbfe975d0fe566e481e9098e3fffb9 SHA-256: 4034035b44d0756e47015270e679fcd45d24c181e6dc4bae14140ed43bfa57b9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress sites, suggesting it's part of a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate the document is likely used to facilitate phishing or distribute further malware. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://philabc.ru/uplcv?utm_term=world+cup+schedule+2018+pdf+est PDF link annotation
    • https://lasvegasrebath.com/wp-content/plugins/super-forms/uploads/php/files/c55b244a22feccb7d0d321951092190e/7586135667.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/37428028983.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe5145c0cd---91657561498.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e40e2510d8---42704981044.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/31611780082.pdfIn PDF document text
    • https://korovin.org/site/img_ufiles/puvimonedigepevovufumitu.pdfIn PDF document text
    • http://mpti.ru/userfiles/file/72574620137.pdfIn PDF document text
    • https://digireg.es/upload/vuwobobavuvinosuje.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d52c1546e7---wafuxasutumep.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9d628e49c---61546666804.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/16462946478.pdfIn PDF document text
    • http://bukharajohnscreek.com/sites/default/files/file/429531596.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/k1h1r7bnscv6qh3dk8u740v7qb/12097523065.pdfIn PDF document text
    • http://metrocars.london/survey/userfiles/files/19373391433.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606d18141bb00---fusafifovatazofuw.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/b584cb097ef1cd2132732e234287bb6d/kixazinovasusoke.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/iogd3hfga14u8ut8697o7fcuac/66401491011.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db1a0bb3f35---pixomigubojun.pdfIn PDF document text
    • http://felixefontesadvogados.com.br/ckfinder/userfiles/files/76790779435.pdfIn PDF document text
    • http://bukharajohnscreek.com/sites/default/files/file/xunabapugajan.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/hppve0992do382ihuq05kmogf3/soxoruza.pdfIn PDF document text
    • http://woodbridgeabw.com/uploads/files/lufiravefanaw.pdfIn PDF document text
    • https://elpollopaulino.com/cenavarra_userfiles/files/mawurezufafijogixizuva.pdfIn PDF document text
    • http://didopack.com/files/9205230143.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098670e4772a---zufinogusizemapusa.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_off0001a423.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A423 10952 bytes
SHA-256: d266561c0d39efd118c86640abde7846d429c033adbca244a23caa6ef6f98a1f
font_01_sfnt_off0001bdca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BDCA 25608 bytes
SHA-256: 508d997e29e7c90ba63e2722efcd14b14dc20e74e515c73ca4a1aeab5eaab2fd
font_02_sfnt_off0001fe32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FE32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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