Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c72f47c86890d25…

MALICIOUS

PDF

69.8 KB Created: 2021-09-30 22:47:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 459e9aa23eba07a8c6f713a0bb96e13a SHA-1: a8e093ddc026461a1b28493510ffb9e4d979071f SHA-256: 8c72f47c86890d255d6e6b5242d36c3d1f6a6e0520f1f7a7dc8de17443a873f9
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to multiple compromised WordPress upload directories and disposable hosting sites, suggesting an attempt to distribute malicious files. The ML classifier strongly indicated maliciousness, and the presence of numerous external links supports a phishing or malware distribution vector. No scripts were extracted, but the structure itself is indicative of a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • 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://chafewyuok.handysociality.com/upload/files/wowujanokejoziwikeko.pdf In PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/08e0272754cfc0fa3c926c3ef32a7d06/55381176299.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ca030b718e8e642796e65144eac2389a/30383456193.pdfIn PDF document text
    • http://konditsionery-zheleznodorozhnyi.ru/upload_picture/file/68944595930.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/nuxavemonederij.pdfIn PDF document text
    • https://lazerom.pro/media/file/92439916484.pdfIn PDF document text
    • http://potentialdesign.cn/userfiles/file/1632444333.pdfIn PDF document text
    • http://moriefrusca.com/userfiles/files/someporoxifef.pdfIn PDF document text
    • https://tsolisp.com/files/file/31038332889.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f44ea67328---vabefujopowewodadegopanod.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/77jie2q6jkdlnoeotsiosecist/maxuxirori.pdfIn PDF document text
    • http://surveycook.com/upload/tmp/202109/file/tezokubuxoxipukivokazixi.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1614f381b51409---7800918546.pdfIn PDF document text
    • http://www.moyekolodin.com/files/mamimudepebekapolaze.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/cbeacab8c724026feb4a9f65830a3bb9/jogoruwalogufexosof.pdfIn PDF document text
    • https://jck.ro/userfiles/file/33875871157.pdfIn PDF document text
    • https://www.agcontraincendios.es/ckfinder/userfiles/files/91007357788.pdfIn PDF document text
    • http://turchifiltri.com/userfiles/files/6487327711.pdfIn PDF document text
    • https://nikunjfoundation.org/ckfinder/userfiles/files/vexubipoxekaz.pdfIn PDF document text
    • https://sieuviet.net/webroot/img/files/68639623676.pdfIn PDF document text
    • http://chinamakina.com/userfiles/file/32050315424.pdfIn PDF document text
    • https://www.thic.net/plugin/ce1/ckfinder/userfiles/files/dulokakirara.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614038b52bd65---80181420628.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=fantastic+beasts+book+downloadPDF 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_off0000b093.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB093 16136 bytes
SHA-256: b105bddbcdd43579961aef2b3dc76163fd282fa199d2566d0705df390d5b9948
font_01_sfnt_off0000d9a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A2 10560 bytes
SHA-256: d5e60653241c9d75e48c0a5e9feec852152f36a9e35deae3caccc78836a3e376
font_02_sfnt_off0000f1ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1