Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc737d071820c11b…

MALICIOUS

PDF

74.6 KB Created: 2021-05-05 00:23:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b8b8a639b78231551009c67d268739ac SHA-1: e6e697209cc926808d7c4ae2e23d0528be2bf5ce SHA-256: dc737d071820c11be0de1cd07a6c30cceea228368a6fa77bb9507726c8d69f1c
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to WordPress installations that appear to be compromised, suggesting a link farm designed to host or distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160780fdb4efe8---norelof.pdf
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/b2e2a6a95924c25ff8bd36e284f223c4/70745995551.pdf
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160717b16e5631---vowojidegomisopunarava.pdf
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16077c14ea145a---16355354427.pdf
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/282c1a30b9d928cd3efa4e47c5ea9e2d/43540067389.pdf
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607938674fb5c---22359003556.pdf
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160769f625add8---xazirulasopenome.pdf
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080b30edb960---89785628979.pdf
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/qut4059e6hd59ou3o6vbenhphg/lokujazovexirovarewoti.pdf
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/un1amos93dg3hmm8vqj3op092bjndr8c/2303854682.pdf
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7dc5b74d6---37246415318.pdf
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fae305a76e---55049347741.pdf
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160763f5ed0c03---leketifevedafedofokofef.pdf
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/5bi0l55u1rgeijmoqsbuno5rpm/94369590643.pdf
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607140f56f1a5---42156813426.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=articles+in+english+exercises+with+answers+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9df.bin
3bf9426714d0bf26fc8bae195d03fa02458468c4a8bc9d248d57febd205020e4
pdf-font-stream PDF embedded font (sfnt) at offset 0xD9DF 5244 bytes
font_01_sfnt_off0000ebb7.bin
9129900ca9894714c062fe168a102c6bcaa710ee0312d17ec7d747ded7bfa231
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB7 10164 bytes
font_02_sfnt_off00010e81.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E81 4324 bytes