Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f2c4a529d8dacf7…

MALICIOUS

PDF

70.5 KB Created: 2021-09-12 02:24:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 29098c40b093200e885a0deb34775118 SHA-1: d1b9ff447db3b84546c3c041fb2c6d00de832b51 SHA-256: 3f2c4a529d8dacf7063babb4ed69e05dc8584bf21686d95f5baa700945ee39ce
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many embedded URLs pointing to various websites, including those hosted on compromised CMS platforms. The presence of multiple links on potentially disposable hosting and the use of 'utm_term' parameters suggest an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://ahlhy.com/uploads/file/041621286513.pdf In PDF document text
    • https://mtmnetwork.net/uploadEditor/files/96246889017.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/161356ef1dd19f---8792825606.pdfIn PDF document text
    • https://lexcyberia.com/userfiles/files/46988259187.pdfIn PDF document text
    • http://residenzaeden-albisola.com/userfiles/files/dewib.pdfIn PDF document text
    • http://dohertylaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sorubiwibekomuradadujo.pdfIn PDF document text
    • http://www.icf-plant.com/files/file/78520507834.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0ed00c410---85090588886.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d2af11414e---66611354468.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161306edabfabe---36689832473.pdfIn PDF document text
    • http://simkoongschool.com/uploads/editer/files/gavujig.pdfIn PDF document text
    • https://deshpanday.com/ckfinder/userfiles/files/xalotamiz.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132cbcd63a0f---82648244217.pdfIn PDF document text
    • http://dansungsala.com/uploads/files/72255254906.pdfIn PDF document text
    • http://szybkieprawko.pl/szybkieprawko.pl/user/admin/fck/file/94442490838.pdfIn PDF document text
    • http://primebrokeragetx.com/ckfinder/userfiles/files/dolerilizunomigudedoxekad.pdfIn PDF document text
    • http://poetische-malerei.de/web/editor/files/riwidij.pdfIn PDF document text
    • http://lsbwg.com/ckfinder/userfiles/files/20210911/1404357172.pdfIn PDF document text
    • http://winfielddeli.com/ckfinder/userfiles/files/60712057926.pdfIn PDF document text
    • http://luchetti.it/userfiles/files/34907745639.pdfIn PDF document text
    • http://qwerty.pl/_data/file/2835306282.pdfIn PDF document text
    • http://bavlas.lt/ckfinder/userfiles/files/fenoxusunoni.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/63588328982.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/nezavavusawimo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=think+and+grow+rich+pdf+in+teluguPDF 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_off0000b1e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1E4 16196 bytes
SHA-256: 471c4ba094bcd18d22c90c555064a72be25b3b6d09807b76b6c5821576f98ec2
font_01_sfnt_off0000db29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f340.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF340 10972 bytes
SHA-256: 02e7b3650c0a9b4570e756da62c7eaad1ff001c8ed165200a75fad8827cbc117