Malicious PDF — malware analysis report

Static analysis result for SHA-256 783f7b5de9ce5aa5…

MALICIOUS

PDF

74.8 KB Created: 2021-09-06 06:30:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6a69b28b4a46d9448f21cddc9e12d303 SHA-1: 9f23f2d01aac8a535179860b30b9b96632191f02 SHA-256: 783f7b5de9ce5aa5b3c3e7b70119a1b3f8f61936842220b6fdda0aaded1602a5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure strongly suggest a phishing or malware distribution campaign, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • 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.
  • 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=molecular+techniques+in+bioremediation+pdf PDF link annotation
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/be344f2306ed4bef83d3728870e36cd0/23164004527.pdfIn PDF document text
    • http://merwepizza.com/upload/file/bujovujafomebofogi.pdfIn PDF document text
    • http://www.seja.lv/assets/ckfinder/core/connector/php/uploads/files/82569126294.pdfIn PDF document text
    • https://riwg.in/userfiles/file/24224076916.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607716d000233.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16087395aab5b3---vorolarit.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612029aa19be8---wolezomuxamibogebewad.pdfIn PDF document text
    • https://haisanquangninh.org/data/dulieu/files/wademenova.pdfIn PDF document text
    • http://emons-verlag.net/testarea/cwsCMSlight/media/files/sizenusokatewefi.pdfIn PDF document text
    • https://pensiunea-escape.ro/ckfinder/userfiles/files/xotevuvokigete.pdfIn PDF document text
    • http://ms-beauty.com/ckfinder/userfiles/files/barorudaw.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/viwowi.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/a7661f018c23f87d6a0a45d345f1fbab/44580888566.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/b38cad1c2a52afa8ba9ba876363399cd/18982519816.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/52618128881.pdfIn PDF document text
    • http://csc010.com/userfiles/file/20210630175312_2u8av3.pdfIn PDF document text
    • http://wedding-box100.com/uploads/files/202108280447304731.pdfIn PDF document text
    • https://sweetburden.com/upload/users/files/pegavosonasuvilibobobo.pdfIn PDF document text
    • http://obrienbuilders.com/userfiles/file/2373052278.pdfIn PDF document text
    • https://laflammerouge.ch/userfiles/files/27802521103.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3f1dcd0bf---61691328146.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160e14724d55b6---tewikojodepodo.pdfIn PDF document text
    • http://streetnn.ru/data/upload/ck/files/vapifotisinafapa.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_off0000bff4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFF4 17108 bytes
SHA-256: f5d586bf3c629a1b0c232e20f73152257e05f35567de84f517b88cd3ec89e211
font_01_sfnt_off0000ebb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB1 11264 bytes
SHA-256: f3276fc2a748a5b830915217fa48567755828c565657f6bd40495b51b6ba6eb6
font_02_sfnt_off00010579.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10579 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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