Malicious PDF — malware analysis report

Static analysis result for SHA-256 6aaa28f4b46b0f83…

MALICIOUS

PDF

81.4 KB Created: 2021-09-12 03:18:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: dec665539abbb28a64e10fcb71e67e34 SHA-1: 4b22e0768180aadd7c6d7cb270d11c765ddf146a SHA-256: 6aaa28f4b46b0f83a3bdc66124532f2c2a0b89cd4792d3d1489131def9721a5c
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous embedded URLs, many of which point to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The primary attack pattern involves luring users to external sites via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/0f04d0f6de2953a2380a4f96ed653a32/13911390234.pdf In PDF document text
    • http://berbun.com/user_img/file/16637771826.pdfIn PDF document text
    • https://cicasoftavukatwebsitesi.demowebsiteleri.com/upload/files/muwafagexuzuragu.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/tamawinipobavebusafazode.pdfIn PDF document text
    • https://alexspa.pl/userfiles/file/naxuvevexesulevevu.pdfIn PDF document text
    • http://warmistore.com/userfiles/file/zarizudukupumubitazowa.pdfIn PDF document text
    • https://bosgo.mn/uploads/files/83539582268.pdfIn PDF document text
    • https://huangs.tw/uploads/files/202109012335285138.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/d76dfcf18ab3e6809c4b320a6cacb895/liludewuxilelawor.pdfIn PDF document text
    • http://elmbbq.com/uploads/files/81257448294.pdfIn PDF document text
    • https://magnanerie-cazilhac.com/userfiles/file/25456527233.pdfIn PDF document text
    • http://njbeihang.com/uploadfile/file///2021090119590663.pdfIn PDF document text
    • http://soc-in.com/data/media/files/70885013530.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/dezuraz.pdfIn PDF document text
    • https://zlatartopalovic.rs/files/memoduwuvela.pdfIn PDF document text
    • http://paddockj.com/user_data/editor/ckfinder/core/connector/php/upload/files/65585634093.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/16092333355.pdfIn PDF document text
    • http://tydafa.com/dafa/uploadfiles/20210904162930.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/51decfd0cfd4200c450c5d9d5cebc2a9/tomonavupuzexalowulane.pdfIn PDF document text
    • http://www.temaricerca.com/entry2013new/admindia/ckfinder/userfiles/files/24512769539.pdfIn PDF document text
    • http://www.biharikft.hu/bihari-admin/ckfinder/userfiles/files/guxenepawepital.pdfIn PDF document text
    • http://soluzionebenessere.eu/userfiles/files/xovasafowujulefomin.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/3528634f70c0a08459b58687022ac836/tupev.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16135f4da1f4b1---fatosexuzosodupozif.pdfIn PDF document text
    • https://izometal.net/mm/file/73342173561.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=the+oscars+2021+watch+onlinePDF 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_off0000d7ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7AD 10672 bytes
SHA-256: 8a7255fbfcae9c72a78e50fa9bd1b178268ee49ed27caffbdcb6911c112aa7b2
font_01_sfnt_off0000f043.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF043 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010855.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10855 18020 bytes
SHA-256: eabe95c6706adc45ba388ba8742aacd40d187da1b4e9f7f5b2fa398f3b1257ee