Malicious PDF — malware analysis report

Static analysis result for SHA-256 11e3f0f4b6ed2846…

MALICIOUS

PDF

79.3 KB Created: 2021-09-13 15:23:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 732f5ab9c4dbe7d94a0d52422852d957 SHA-1: 80ac3f56c46f479c751cdc1a186a32ca95c168ca SHA-256: 11e3f0f4b6ed2846867cff7de9ea49c963dbc09762038d95e18c2d9b14f4c562
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the PDF structure and embedded URLs are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://eagleegg5k.com/ckfinder/triplebuserfiles/file/62558963106.pdf In PDF document text
    • http://familiegravesen.dk/ckfinder/userfiles/files/noburoladulazakazoz.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e610891929---82392364455.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/repikojojegogepamupodugo.pdfIn PDF document text
    • http://www.lasallelille.com/admin/ckfinder/userfiles/files/tejikulunakiziteza.pdfIn PDF document text
    • http://nenorm.com/files/files/53653595196.pdfIn PDF document text
    • http://kommunikator.nu/demo/userfiles/file///63261785234.pdfIn PDF document text
    • http://dwornawodzie.pl/userfiles/file/givifasifasakepajitiw.pdfIn PDF document text
    • https://nistd.in/userfiles/file/2455173522.pdfIn PDF document text
    • https://mygrind.ie/userfiles/file/fovexurawa.pdfIn PDF document text
    • http://tndgdemo2.com/ckfinder/userfiles/files/xojikatidupuvoxakos.pdfIn PDF document text
    • http://tostonet.cl/ckfinder/userfiles/files/lilidizenametidefowar.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f335428115---limepob.pdfIn PDF document text
    • https://acp-luxusingatlanok.hu/ckfinder/userfiles/files/55656657801.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/161384bde9a9d5---vanenewujeka.pdfIn PDF document text
    • http://majorpropertygroup.com/userfiles/files/tabimeforukibasixuwefonuf.pdfIn PDF document text
    • https://idroilektriki.gr/files/file/27016078403.pdfIn PDF document text
    • https://saleskerala.com/ckfinder/userfiles/files/dibawubodotibo.pdfIn PDF document text
    • https://www.esicm-old.org/admin/lib/ckfinder/userfiles/files/lilekerafedenituvuronajo.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/begunajekejatixamobus.pdfIn PDF document text
    • http://kemmurad.com/webroot/img/files/xopegejufudo.pdfIn PDF document text
    • https://millersexpress.com/userfiles/file/pemimuvojufujekifaj.pdfIn PDF document text
    • http://www.elstar.ru/uploads/files/ladoweziji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=install+cinema+hd+apk+on+firestickPDF 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_off0000cec1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEC1 18212 bytes
SHA-256: 0e8136a16f3282d11b2256f5cdf996f800b7f364c36eaaba174b8ffb87f614e7
font_01_sfnt_off0000fe1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE1C 10928 bytes
SHA-256: 2531a7a9d4ffb3bb168a64a3a57ad9e55a1ea17003249c3e9939c034c1b2db51
font_02_sfnt_off00011732.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11732 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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