Malicious PDF — malware analysis report

Static analysis result for SHA-256 211d15953205aeb1…

MALICIOUS

PDF

73.8 KB Created: 2021-09-13 02:28:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a64fea1cb02172ed1fe79295221927c1 SHA-1: 34475b354500cd31e2314763c5fbd045cefc78c3 SHA-256: 211d15953205aeb1cab25ed5dd8b833478fd796c5eabfb8d9ea57bc3375b8d9d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://queure.ru/uplcv?utm_term=free+online+converter+from+excel+to+pdf PDF link annotation
    • http://mingmitrcoffee.com/user_img/files/43980321309.pdfIn PDF document text
    • http://ty-universe.com/image/files/20210902_121241.pdfIn PDF document text
    • http://standdominica.org/files/files/21917909028.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/31874546903.pdfIn PDF document text
    • https://sunsetlearningcenter.com/userfiles/file/janixininebub.pdfIn PDF document text
    • http://psystems.gr/Administrator/uploads/userpics/OutPostImages/files/xesarilewivanezibekifaji.pdfIn PDF document text
    • https://vas-vill.hu/userfiles/file/bokuluwisufu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e76ab8a473---13241855788.pdfIn PDF document text
    • http://designpavelzapletal.cz/files/file/suruxebovisulazovasatos.pdfIn PDF document text
    • https://un7un9b3rl1pa7-99.com/contents/files/16196753212.pdfIn PDF document text
    • https://kabelkyaobuv.sk/editor_uploads/files/10158934952.pdfIn PDF document text
    • https://searchlink.org/userfiles/file/47315574336.pdfIn PDF document text
    • http://kutyasturak.hu/images/files/21104826922.pdfIn PDF document text
    • https://www.nhabe.com.vn/ckfinder/userfiles/files/pojobewujobare.pdfIn PDF document text
    • http://sushistoryus.com/uploads/files/1015154934.pdfIn PDF document text
    • https://areicon.com/images/file/fofasikod.pdfIn PDF document text
    • http://tucsokszekszard.hu/images/news/file/tamuxosir.pdfIn PDF document text
    • http://josephfellerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/futew.pdfIn PDF document text
    • https://affordans.com/ckfinder/userfiles/files/36506211137.pdfIn PDF document text
    • https://dammesliepas.lv/ckfinder/userfiles/files/guropomiviwetexikamerafot.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/b4a111cde451d5715dad4654db4872c5/nuxedipumakoxinopo.pdfIn PDF document text
    • https://pmrmhss.com/userfiles/file/matodiko.pdfIn PDF document text
    • https://mangalargalux.com.br/ckfinder/userfiles/files/25954368127.pdfIn PDF document text
    • http://babijie.com/upload_fck/file/2021-9-2/20210902034539977886.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/553bd63cf7bf01545c4ac49ab5435167/nejujo.pdfIn PDF document text
    • 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_off0000bee0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d6f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F2 16432 bytes
SHA-256: ab8ff937f7c999a0981b31faefbc19073d744b1769479f51dbbc4e5e52abbda2
font_02_sfnt_off0001013f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1013F 10596 bytes
SHA-256: 5efa10b39a8a2850994c050766fcad717ce9466b18f3449c15e6e8a0218c97d1

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