Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c53e5256cf6cb21…

MALICIOUS

PDF

83.5 KB Created: 2021-08-28 20:58:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 67327a987ebc383b2b926d2cf181f47f SHA-1: a6a403fa83ffb6d2bcc082a08b42d400eca6185f SHA-256: 8c53e5256cf6cb219db3d9e5be899bc48e6497a8efa01dc25ae3e66464f4c425
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution intent. It functions as a link farm, containing numerous embedded URLs that point to compromised WordPress uploads and other potentially malicious sites. The primary goal appears to be directing users to external resources that may host further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://brazilairporttransfers.com/ckfinder/userfiles/files/bagojararamirep.pdf In PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/c72c42ebe85ea92eeb3fdaed86364962/75779083572.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/160f428f2e2389---venixedokolexejobora.pdfIn PDF document text
    • http://dkyangmei.com/uploadfile/file/2021062922034973499.pdfIn PDF document text
    • http://thaimassageboy.com/ckfinder/userfiles/files/860121663.pdfIn PDF document text
    • http://castel.lu/userfiles/files/91752638125.pdfIn PDF document text
    • http://beergolfers.com/blog/images/file/96653554020.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16085a60e7de20---26834692002.pdfIn PDF document text
    • http://rentaruedas.com/files/others/84554547474.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d441d868017---norigusoguwi.pdfIn PDF document text
    • http://aiskreunion.com/clients/b/b4/b417c2091670ce0b0d78f4b231aea02c/File/namije.pdfIn PDF document text
    • http://sellmysayarah.com/userfiles/files/pojapoxe.pdfIn PDF document text
    • http://lagunaapartman.hu/images/user/file/defivololobovuxuduli.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160cd6de59fbcd---zururutuz.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f75c27f11a---manobobazonukoxeb.pdfIn PDF document text
    • http://ros.by/ckfinder/userfiles/files/28305080460.pdfIn PDF document text
    • http://khanaphatgroup.com/UserFiles/file/zovizebowo.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/74nbksltkqdlmcjuhpurj4k01u/59951612526.pdfIn PDF document text
    • http://iviltra.lt/images/files/dexivexesugisevef.pdfIn PDF document text
    • https://micro-logic.ro/images/uploaded/file/83877747383.pdfIn PDF document text
    • http://fautographie.org/images/userfiles/files/98308903567.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/82048567412.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e5b87d782---71858677524.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=innocent+words+to+turn+her+onPDF 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_off0000e03b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE03B 17960 bytes
SHA-256: cb08d618a4ec80551ad2a8c31547240c1976c66d81f274aacf3704aef54dc284
font_01_sfnt_off00010eca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ECA 10304 bytes
SHA-256: 377df64b7fe9d5103c9e42323d1d9342661bed908afb899274f7a97241e8f4fe
font_02_sfnt_off00012608.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12608 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.