Malicious PDF — malware analysis report

Static analysis result for SHA-256 05890a86e9d4dc3d…

MALICIOUS

PDF

85.0 KB Created: 2021-07-19 12:45:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 77de1d6603559fbb4225f8567f209b40 SHA-1: 5fe852084dfed874c0adad00c1def1d6e19b57e8 SHA-256: 05890a86e9d4dc3d2ed1a8b487fa80147e15139f0abe90e3b43694b356338574
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Several heuristics identified the document as a link farm, with many URLs pointing to compromised WordPress upload directories. The presence of these links suggests an attempt to distribute further malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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/85c1c94a6cf62f2ee8e238c26fcb9f2c/dogezupemudovumat.pdf In PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf8be284e9e---dawidaxokalejobes.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160853b1b9403f---fabinad.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e8bbc62ddaa---fuselalarotafozifeza.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088e21861aa1---darugakefunavomav.pdfIn PDF document text
    • http://xnucleus.com/members//member_images/files/negokumelegonanariwiriz.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160794b8aaa24c---luramenomurogunu.pdfIn PDF document text
    • http://alexhofford.com/temp/files/file/xurimuwemaxijin.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adb09e229f1---leboxopaloluxapedugeka.pdfIn PDF document text
    • http://cnokorea.com/userfiles/file/7693511399.pdfIn PDF document text
    • http://pekingtogo.com/uploads/files/75648175695.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/jnkifkqkl3gg04b9rti6fiskug/gewubanuno.pdfIn PDF document text
    • https://sanaspinler.com/calisma2/files/uploads/91931220967.pdfIn PDF document text
    • https://soechi.net/userfiles/file/30524168977.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/857f5182131e5df558f35098513487f3/wuliwarijijisozixasan.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210503013256325.pdfIn PDF document text
    • https://carparts-fixture.com/file/file/43982005921.pdfIn PDF document text
    • https://menuiserie-sainte-anne.fr/userfiles/file/67394914227.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/birisiwurow.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160bbb817109b1---53153340907.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609479ac4c35f---refoxib.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/f63595dfc2ca3e5c159198b0baf8e86f/vudedozajufalaga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=download+minecraft+windows+10+for+free+full+versionPDF 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_off0000ea21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA21 11064 bytes
SHA-256: 45432f64f0e7d9ccb6a2dcc2c3f8254f242d66a709ed1644333f6423f4d55c44
font_01_sfnt_off000103f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F1 16416 bytes
SHA-256: c646a297600e3408df9898d9f88947005b2adb091c647fd81af6f4a998545ac7
font_02_sfnt_off00012e5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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