Malicious PDF — malware analysis report

Static analysis result for SHA-256 289128db3eeeaa46…

MALICIOUS

PDF

78.3 KB Created: 2021-09-12 05:49:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a965bf6afc5177b99c7f8703fc2e8768 SHA-1: f0fd09816c4fb8da4fdb56d91921dcec824613c3 SHA-256: 289128db3eeeaa460a1fd78a2d884f1d76a6567bbbe1c68db553311023f8c09e
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://quaisetoiles.fr/img_pages/file/nemifax.pdf In PDF document text
    • https://thegioibaobicarton.com/Images_upload/files/daxexozagasewazisidep.pdfIn PDF document text
    • https://alternativecarrepair.nl/userfiles/file/domavegabige.pdfIn PDF document text
    • http://area100impianti.it/userfiles/files/soretudixijopixumox.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613c6e45ef345---bewimarukofovawe.pdfIn PDF document text
    • http://bradhelferlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/93825588341.pdfIn PDF document text
    • http://vmkmsz.hu/userfiles/file/76705527793.pdfIn PDF document text
    • http://manavpublicschool.org/manav/userfiles/file/16564760539.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/68e554f2f652cb9512bdabc3fb73c290/21243616380.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1613832f171e43---luforiporubaj.pdfIn PDF document text
    • http://unseretochter.com/images/file/13639343329.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136e77a5ef31---visizokuturokuv.pdfIn PDF document text
    • https://basisangka.com/contents/files/79794341382.pdfIn PDF document text
    • http://bogaarchitetti.it/userfiles/files/sebuvavevunugasenado.pdfIn PDF document text
    • http://eastindiaspray.com/suvra/eastindia_spray/files/dofojesosisagijemitaxi.pdfIn PDF document text
    • http://www.cddfct.com/up_files/file/kexipozokovapuvarufotag.pdfIn PDF document text
    • http://ubytovna-krumlov.cz/userfiles/file/765789852.pdfIn PDF document text
    • http://deforma.it/userfiles/files/20102006534.pdfIn PDF document text
    • https://ofcourselc.com/admin/uploadsfile/2892971549.pdfIn PDF document text
    • http://ricoconsultingattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/34024716421.pdfIn PDF document text
    • https://fotokeramika.bg/userfiles/file/rapibozunilipepiwoj.pdfIn PDF document text
    • https://defi128.com/userfiles/files/duzadesulis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=change+default+player+in+androidPDF 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_off0000cd81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD81 10856 bytes
SHA-256: 2d84fc23a2134e863cccc733fe1c680483d3c243d0775afb41fc9f3b745ac2c4
font_01_sfnt_off0000e64e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE64E 17576 bytes
SHA-256: 62aceaafc562ff7bf628d9238ea4d473cf1789ba97d52448f3b67cc42ff9851c
font_02_sfnt_off000113bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1