Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bb86f5dea0c18ed…

MALICIOUS

PDF

87.1 KB Created: 2021-09-17 20:57:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1818251f47f7d2433756d20f9ccdc0a7 SHA-1: abaf5a0b989774dd5c47fc1fa4d484e5cc97d539 SHA-256: 3bb86f5dea0c18ed2a3ce07ba761ec6fa131e48c2d20225d3248d5767e609da3
156 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by ML classifiers and ClamAV. It 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 manipulate search engine results. The presence of external URIs and compromised CMS upload links indicates a potential for redirecting users to phishing or malware download sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://wastran.ru/uplcv?utm_term=how+to+make+android+app+on+pc PDF link annotation
    • https://costabravas.com/uploads/localidades/files/64562013398.pdfIn PDF document text
    • https://sunriseinnjasper.com/nbloom/fckuploads/file/7418055373.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130ae1043424---jusoxugife.pdfIn PDF document text
    • https://natyabio.com/uploadfiles/rajepevewabagozok.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f8747aca1f---98512456201.pdfIn PDF document text
    • http://nemochem.cn/upload/files/xivatixu.pdfIn PDF document text
    • https://vicotelecom.vn/static/source/images/file/sifobomasifogegawesofejik.pdfIn PDF document text
    • http://fsf-vastroad.com/userfiles/file/55290775196.pdfIn PDF document text
    • http://worldtile.net/jangheung/userfiles/file/91383284487.pdfIn PDF document text
    • http://xiangzhuan.tw/upload/files/22781220058.pdfIn PDF document text
    • https://uzmanwebci.com/calisma2/files/uploads/buvasokesuwomizogarom.pdfIn PDF document text
    • http://szkolaprzybranowo.pl/ckfinder/userfiles/files/mubedipajumefepakori.pdfIn PDF document text
    • http://biirbeh.mn/images/content/file/ruburilekuxizejivujak.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/161410e1cd6b51---25389477245.pdfIn PDF document text
    • http://keifo.ru/ckfinder/userfiles/files/duduroroduv.pdfIn PDF document text
    • https://cfi-registration.org/buzzboxgift/img/userfiles/files/gapawasara.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff7b4409a5---vodafi.pdfIn PDF document text
    • http://rzn-house.ru/upload/file/jatel.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/cf0ccf6fee570433c3094c42f888e31e/visokefixozoponeja.pdfIn PDF document text
    • http://dansungsala.com/uploads/files/25906300116.pdfIn PDF document text
    • http://queensparkview.com/image/upload/File/noriloresuwu.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/lkod56q4h16m48k34jg97fuuq1/76914575874.pdfIn PDF document text
    • http://abwalabamaave.com/uploads/files/gifusikiw.pdfIn PDF document text
    • http://wohingltd.com/userfiles/rizaxadipozumafajuzix.pdfIn PDF document text
    • https://christianklein.eu/Quansis/ckfinder/userfiles/files/60550978959.pdfIn PDF document text
    • http://186086.com/upload/files/77677094924.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_off0000f180.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF180 10632 bytes
SHA-256: 94d79a007ff9b90c27d2ecfa0407bf5df873c3494807273471e64f7114a4604b
font_01_sfnt_off000109c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109C6 17180 bytes
SHA-256: 14fb04fa412eb5eaa57f8683aad995df56caf1de001722c0fd2ca2d63c4dd706
font_02_sfnt_off00013620.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13620 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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