Malicious PDF — malware analysis report

Static analysis result for SHA-256 53e2d6f9e43ebe88…

MALICIOUS

PDF

73.7 KB Created: 2021-10-04 13:36:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 4dc47a00560e6409c4f5a30628773ca8 SHA-1: 1b475b52d06ce7e0150a83669c316636954df649 SHA-256: 53e2d6f9e43ebe882aacbb21f9758e3b8f7a4e5b0471924e49bf89ea0649c37f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, directing users to numerous external URLs, several of which are hosted on compromised WordPress upload directories. The presence of embedded URLs and the nature of the link farm suggest an attempt to lure users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://seghers.kr/data/editor/file/19950592876139e7e37da57.pdf In PDF document text
    • https://bompentax.com/quangbasanpham/app/webroot/upload/image/files/94200216259.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/f3b415ce4e2df5792455754a9f266d89/78021521518.pdfIn PDF document text
    • https://windscrm.net/files/file/72676403942.pdfIn PDF document text
    • https://aiaciran.org/cache/fck_files/file/wogewalurolof.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/0e1c902d18ee384b94f0709f9293de3f/busipupudoliromo.pdfIn PDF document text
    • http://kiavysocina.cz/UserFiles/File/zifekoketutex.pdfIn PDF document text
    • https://calprin.com/ckfinder/userfiles/files/nalisafewuwat.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161515b3894f91---93960030041.pdfIn PDF document text
    • http://hongdacable.com/d/files/zuwepafexunoguzom.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021100302025759.pdfIn PDF document text
    • http://ghefootmassage.com/fckeditor_userfiles/file/37069322153.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/xibolupisugare.pdfIn PDF document text
    • http://huijingweb.com/upload_fck/file/2021-9-26/20210926215041920886.pdfIn PDF document text
    • http://xn--54-dlcdkamdj4btild5b.xn--p1ai/ckfinder/userfiles/files/lomoxuwepudemofitetidomu.pdfIn PDF document text
    • http://regiapart.si/uporabnik/file/sajaja.pdfIn PDF document text
    • http://chinasoftcore.com/userfiles/file///bufavi.pdfIn PDF document text
    • http://nationalcoopadvisors.com/userfiles/files/26812153957.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/k021acah0bvarlgs2a4pmmevll/69778639896.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fce5eba893---fonedewejad.pdfIn PDF document text
    • https://robindayne.com/ckfinder/userfiles/files/pujekun.pdfIn PDF document text
    • http://dobosugyvedkecskemet.hu/userfiles/file/vulewijoxomulobufegifa.pdfIn PDF document text
    • https://kitapkaplama.com/upload/ckfinder/files/50778824224.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=intext+questions+class+12+chemistry+solutionsPDF 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_off0000bc00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d417.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD417 11080 bytes
SHA-256: 1033b190d69c41797db0ec5bbb55f7dac5a9ae01cb9e40f3be3149782f59e03a
font_02_sfnt_off0000ede1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE1 16712 bytes
SHA-256: 17879378add4f6dc5d88280139c8c6ecb1afb2f301a8f81de27c37dca11f3090

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