Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2c013472d4b9ba1…

MALICIOUS

PDF

84.1 KB Created: 2021-09-20 20:02:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: f69243ccc1c8a8e6f73892f4b979a495 SHA-1: 1a7cd01d85f0cf04575dc6805e3eed6602b505f4 SHA-256: d2c013472d4b9ba17037c4cc7dca5d93513b65c364b50a00097795582715e019
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it contains embedded JavaScript and a link farm pointing to compromised WordPress upload storage. This suggests the document is likely part of a phishing or malware distribution scheme, potentially using the embedded JavaScript to execute malicious code or redirect users to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e8494c8cf1---70445485884.pdf In PDF document text
    • https://marathonroller.com/userfiles/files/56984260741.pdfIn PDF document text
    • https://stotex.rs/files/lufimidemobotogoj.pdfIn PDF document text
    • https://goodline.by/userfiles/file/82044580269.pdfIn PDF document text
    • https://oasis-travel.ro/files/rerodotesajekopupamo.pdfIn PDF document text
    • https://magerp.org/upload/files/sexezitu.pdfIn PDF document text
    • https://nonbodepsg.com/uploads/files/37680008695.pdfIn PDF document text
    • https://shunnasato.com/1599157041.pdfIn PDF document text
    • http://a899.net/userfiles/file/38512863781.pdfIn PDF document text
    • http://quimis.net/js/ckfinder/userfiles/files/30759980561.pdfIn PDF document text
    • http://cheliabinsk.realxenon.ru/uploads/files/94446883824.pdfIn PDF document text
    • http://prasongp.com/file_media/file_image/file/wemekuguf.pdfIn PDF document text
    • http://webinaris.training/ckfinder/userfiles/publics/files/sewewu.pdfIn PDF document text
    • http://china-zub.ru/userfiles/file/goponujemomejafemako.pdfIn PDF document text
    • http://zagazzo.com/userfiles/file/jikikozifupisukibagomi.pdfIn PDF document text
    • https://cafemocion.com/userfiles/file/filadogugune.pdfIn PDF document text
    • http://stensoproject.com/userfiles/files/11492757417.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131ddb857351---77102116630.pdfIn PDF document text
    • https://kcharp.com/ckfinder/userfiles/files/xudamepawotuvikifojudunok.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16146c2560dd71---46092824054.pdfIn PDF document text
    • https://eminentland.com/admin/userfiles/files/wozowibusele.pdfIn PDF document text
    • http://primeasset.hu/fileok/file/tulesikatonapafadurif.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16140d177b27d1---pepupiwugonudotimodefo.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-9-11/20210911185651143897.pdfIn PDF document text
    • http://www.taxivanclass.com/uploads/ckfinder/files/36852469912.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+check+bluetooth+version+androidPDF link annotation
    • 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_off0000e45d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE45D 17504 bytes
SHA-256: 0a71574ea71e6b8db4d51cea5b6e083c3d51ced20e5776fc6d2f79ceb7bf19fe
font_01_sfnt_off0001110e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1110E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012925.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12925 10944 bytes
SHA-256: 52d025f61736fae31bac95a0024ecb712bd49111072764f5ecdbd347e81eba4a

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