Malicious PDF — malware analysis report

Static analysis result for SHA-256 673aa3459453bba4…

MALICIOUS

PDF

98.4 KB Created: 2021-09-15 12:33:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ac3bc027b11e47f1f8a24468e9f1aa00 SHA-1: bd8bff7e9513593dd7f1a6bfeafbf1853a516c70 SHA-256: 673aa3459453bba419cb2e1c046a29f53dcb8ab69e10049d39274ca103f4e775
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other domains, suggesting it's used to distribute phishing content or malware. The presence of external URIs and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://gonganmi.com/userfiles/file/rupomekasuvonupanagapow.pdf In PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141161d5902f---85569606179.pdfIn PDF document text
    • http://geose.ru/userfiles/file/suguluredarinutaxuxava.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/161353c2ec9865---46185203435.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135e3ff94b69---gominitunoxelolonuv.pdfIn PDF document text
    • http://www.dean-cpa.com/files/adminpic/file/79664029857.pdfIn PDF document text
    • https://crbz.ru/userfiles/file/mikolinikufewerike.pdfIn PDF document text
    • http://crmloccitanecr.com/campannas/file/sovasibi.pdfIn PDF document text
    • https://santchavarabed.in/ckfinder/userfiles/files/wusesulupikigixezibod.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613be5dd41874---30836713154.pdfIn PDF document text
    • https://drbumbnursinghome.in/ckfinder/userfiles/files/23072495477.pdfIn PDF document text
    • http://trendstyleimage.com/uploads/ckfinder/userfiles/files/76170817994.pdfIn PDF document text
    • https://liantoong.com/archive/upload/files/tivetadajemomemotopape.pdfIn PDF document text
    • https://newtop-eg.com/userfiles/file/90746113686.pdfIn PDF document text
    • http://ehoron21.mn/uploads/files/fulogubepina.pdfIn PDF document text
    • https://drproperty.in/userfiles/file/tuwadak.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141bc28a7233---95664255581.pdfIn PDF document text
    • https://airbays.com/userfiles/file/56936938970.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/1hq7674v46btnltja13vu3cd27/sadepabiwalozabuju.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/57dd85a60f4d172cdf3514faba43d50e/59315934212.pdfIn PDF document text
    • http://hasyo.net/files/file/kiditobeguxe.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f49fb3cdd5---14962950052.pdfIn PDF document text
    • http://nenayu.com/filespath/files/20210902043013.pdfIn PDF document text
    • http://www.childofafrica.org/media/userfiles/file/33796468916.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=chemical+lab+equipment+namesPDF 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_off00011a7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A7E 18916 bytes
SHA-256: 1cdf7cbb9c49d9ce446e84b39b64f9bc5a35efa9aa6edb8610acb5cab9c11db9
font_01_sfnt_off00014bc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000163d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163D9 10836 bytes
SHA-256: 09e267f84caa336d481b5ed23e7ba439b50ee4a4cd57a19891fd2aad9e640e8f

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