Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cd027dbddc2f9d0…

MALICIOUS

PDF

87.5 KB Created: 2021-09-02 14:01:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: eecfadbe062d3da2d0b270518d94b20e SHA-1: 997127f449f8ad5c938ae64c43195ba77a2f8a58 SHA-256: 5cd027dbddc2f9d0e26ca3e14c2a1a2571fc28c924d1d16cb34053e8391b0214
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites, suggesting a link farm or redirection mechanism. The PDF's structure and embedded links are indicative of a phishing or exploit delivery attempt, likely using a spearphishing attachment vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16124136a6d8d2---21535580380.pdf In PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/87d037306446d91e3761122c29cf1725/44458761297.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2933fb8530---zupiwomivimuvila.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/hovoehoonn9p8474kamsvr2g52/40634799475.pdfIn PDF document text
    • https://kudamatsu.org/userfiles/file/dudegupopegeniraboz.pdfIn PDF document text
    • http://dzbnf.com/upload/file///87938379579.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/nenesa.pdfIn PDF document text
    • http://sun-green.nl/ckfinder/userfiles/files/gujivuresalaz.pdfIn PDF document text
    • http://danchrisjewelry.com/userfiles/file/25585100295.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090c7f2bb6a4---luwuxajuxabitimexunur.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160c780ffe11b1---fazademikozosujibunadidu.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8ca44b506---11624283889.pdfIn PDF document text
    • http://lg-palette.com/upload/files/tegasiginofunepa.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/356be339a7124102cbb1a157fcde5412/fefaruvazobeporiledukud.pdfIn PDF document text
    • https://aannemingsbedrijfbarthulsbosch.nl/userfiles/file/65160646872.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/337871df9b8176298b4e266043b7a331/41945852242.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/1976654835.pdfIn PDF document text
    • http://co-mit.com/uploads/files/zukaviwi.pdfIn PDF document text
    • http://master-br.ru/img/file/bibijizoresiwej.pdfIn PDF document text
    • https://kompaspt2.com/contents//files/gatupupasimapipige.pdfIn PDF document text
    • http://acudrved.com/ckfinder/userfiles/files/paxazaj.pdfIn PDF document text
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa1cddad78---zenipafosuzo.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/qhhn94ai19dc7i2dlsia14j2c4/26565943198.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=damage+control+surgery+guidelines+pdfPDF 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_off0000ef45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF45 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001075c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1075C 11180 bytes
SHA-256: a3d4569022e92aa90abf565571c0751c4bd81dc1c0b1170cca67e732933adb1b
font_02_sfnt_off00012150.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12150 18144 bytes
SHA-256: 005a8769b784a846716c3f0f1f35acd1ac7b6c70b3e2a7bf8975daf786499f0d

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