Malicious PDF — malware analysis report

Static analysis result for SHA-256 eff228d93cac5e25…

MALICIOUS

PDF

77.2 KB Created: 2021-09-06 04:50:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2de6d2b295da74a9d557e35e23b7ff73 SHA-1: 899062c85264f0def0d4bd9b4ef0d80397b50905 SHA-256: eff228d93cac5e2594a0054ec500dc0da21715b71064656a1e8074770bc5ac78
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The heuristics reveal it functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. The presence of numerous PDF links and the use of 'utm_term' parameters suggest an attempt at SEO manipulation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/jq6v4n7k32s7mgcfdq8hr68f47/80998357650.pdf In PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/23700087926.pdfIn PDF document text
    • http://newgatedesign.com/Images_upload/files/mosumusi.pdfIn PDF document text
    • http://ingfrimale.com/userfiles/files/40669661926.pdfIn PDF document text
    • http://sm.ac.th/ckfinder/userfiles/files/mowizazuzoginonafevixu.pdfIn PDF document text
    • http://domeinbeverdonk.be/assets/files/file/99431243059.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aada050f2c4---27195644554.pdfIn PDF document text
    • http://kingnature.ru/files/files/xazakugasefe.pdfIn PDF document text
    • https://thebottombillion.org/business_school/uploads/file/70952510169.pdfIn PDF document text
    • https://dusunceokulu.net/resimler/files/56849941015.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/7e6a1c53d27d9a50005f8b78590dfa02/76519417369.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/6l0qabe7sbehim29svob86uhm5/jerifubuwopore.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/roxalaluzajojolixoragox.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/73f2c779c9b89092c2bae1a240261bca/bixozo.pdfIn PDF document text
    • https://kientrucqhouse.com/uploads/image/files/texujuzuwegoloseleradajak.pdfIn PDF document text
    • http://whitedwarf.ru/public/images/ckfinder/files/gunofefokumenekojilom.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d66db7fce1---83129407583.pdfIn PDF document text
    • https://clubslotalmatriche.com/calcas/file/davaximimebepid.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/gojiwixakarirulitinozawa.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/45170784132.pdfIn PDF document text
    • http://saltyfeelings.com/userfiles/file/92622360749.pdfIn PDF document text
    • https://path.mn/userfiles/files/17442247819.pdfIn PDF document text
    • https://medtek.vn/storage/file/wimufok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=isotope+percent+abundance+worksheetPDF 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_off0000c8c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8C7 10844 bytes
SHA-256: d6bb55e1d1d61efbf37c11789e109d87cabd9bda541e2013eb07a1372a01ee94
font_01_sfnt_off0000e1a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A1 17692 bytes
SHA-256: c0a8027e3f82d095db8ab675547e2f93d5c02293e570d1a70470768053b950bb
font_02_sfnt_off00010f6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1