Malicious PDF — malware analysis report

Static analysis result for SHA-256 1163211457ceff94…

MALICIOUS

PDF

94.7 KB Created: 2021-06-29 02:09:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5b26a306de32b25a674cefd4e5bd952a SHA-1: ea3211ef5aa8aac789cf30b3c90da866b2a39a7d SHA-256: 1163211457ceff94b2473f6fb4c990f52b6f8776398d0f6e48997386acaf5058
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file exhibits malicious characteristics, including multiple heuristics indicating it's part of a link farm pointing to compromised WordPress sites and potentially disposable hosting. The presence of a 'download button' lure and a critical ClamAV detection for 'Pdf.Phishing.Trojan' strongly suggests a phishing or malware distribution attempt. While no scripts were explicitly extracted, the overall structure and URL findings indicate the PDF likely serves as a lure to download a second-stage payload from one of the listed URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://coretry.ru/uplcv?utm_term=user+acceptance+testing+document+template PDF link annotation
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/6ace3bb07b49c19bbd2bc4046ed395ae/45133468288.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/79682924551.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c4dc2434288---gamegivaveb.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5297b6485a---sufisazof.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/8632733c315ac510ce2fc93b17682f30/2771398168.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/2fe7dlc99t013ptsugphpeaokv/vojanokavelofixajaj.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16071ee19ad51e---pefixarade.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7834a424be---41087095567.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/fc343559706b213db89785ffb81b30f0/98765795029.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/rijepozadaxopuwetijiga.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160a72c4854ae4---nobolifejerujiwimujezid.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/1gqcag21ad542bldftfpdujg65/75936076537.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/40226083732.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/6d81326dd62a901cfa3cc74a83d04dd0/gunowelabifiregi.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/27261039466.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/vevajawusupesaneb.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/fukipew.pdfIn PDF document text
    • http://kanchanaspa.com/ckfinder/userfiles/files/silonekutolipesiw.pdfIn PDF document text
    • http://geometrabottero.it/userfiles/files/67341083620.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/9c15fc3200d976bd962c395edf5c4c22/tidumudaguzuronegumatereg.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/c504f4768bfeb0e6751c5c59ab5d8f3b/14424399606.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/a9ac8c38e9c4363b74b5e48e7e5fdc98/jajim.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081427050041---mogowiluvikev.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_off00010ef4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012706.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12706 17320 bytes
SHA-256: 40b63c1246836c8a34ca8f8c36a03c85c3ed94d369e2a277ef23aad9bd2ae8c2
font_02_sfnt_off00015423.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15423 10964 bytes
SHA-256: e15bc07ce79e642f6d9a774cd225740ffbfec0c1f427d8fc4e2779d08e243512

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