Malicious PDF — malware analysis report

Static analysis result for SHA-256 b840a7d3ca80254c…

MALICIOUS

PDF

87.4 KB Created: 2021-09-03 09:53:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6aa1e9e82eb1f2b57e87eab423b343f0 SHA-1: e8cd6c9273dde33c61d136ac316eed5065fc3379 SHA-256: b840a7d3ca80254cd44ecfdd8b006c3906eb88acdfb4e8cd5700daff832eb25e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. The document contains a link farm pointing to numerous external URLs, many hosted on compromised CMS upload directories or disposable domains. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs suggest it is designed to redirect users to malicious content, potentially leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://dennismaloney.ca/upload/editor/file/10204330091.pdf In PDF document text
    • https://hazeloyun.com/calisma2/files/uploads/28518068398.pdfIn PDF document text
    • http://malopolskiszlakwinny.pl/upload/File/93767291693.pdfIn PDF document text
    • http://score1forspencer.com/clients/4/45/4587145e2679cb7673d0e21b436e5c25/File/vefuzakexefupotote.pdfIn PDF document text
    • http://kunjipsc.com/uploads/files/vufudogepekikavazanop.pdfIn PDF document text
    • http://gyndoktors.de/ckfinder/userfiles/files/72681992515.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/23db19a400fafc91ce7c5ee0cf96ff72/lotoweduzupavafufisi.pdfIn PDF document text
    • http://marktoby.com/akram/know_news/admin/userfiles/file/lobunagazukekuwogoraduse.pdfIn PDF document text
    • http://murasakijr.com/uploads/files/80591204812.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/11760278035.pdfIn PDF document text
    • http://www.jokilaaksonratsastajat.fi/file/zilirabit.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/0e31knddmukrpju0od4e14ak26/68265662759.pdfIn PDF document text
    • http://henanshuangxin.com/d/files/zuxatizinidopimi.pdfIn PDF document text
    • http://yogo110.com/userfiles/file/16588782193.pdfIn PDF document text
    • https://resulgame.com/calisma2/files/uploads/4558968688.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/40271467fe217556bb97271b04cc4ebc/69521211630.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ee503a0a82b---zabujusuna.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/6f5b7ba44a857f077f81337175627a18/betexulilabubivi.pdfIn PDF document text
    • http://honyi.tw/ckfinder/userfiles/file/fijudapuwo.pdfIn PDF document text
    • http://mbjarrahi.com/UploadedFiles/New/file/16370977641.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a4bf3b512a6---96372127809.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/d2f14512914f335162294c63e6c7b224/93121261236.pdfIn PDF document text
    • http://sake2metustin.com/uploads/files/taneguxebujatawomuxeganu.pdfIn PDF document text
    • http://goldenbaycruisesagent.com/userfiles/file/99293858441.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-8-18/20210818114105984486.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/477dd477e700601681cd8684fc44f5a4/mipapidipidiwebotekeveke.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/ga8kdpccvp3gbe4c6k760amcu2/62839819674.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=2017+naplex+practice+questions+pdfPDF 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_off0000e766.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE766 20520 bytes
SHA-256: 4827ef461f1a84e5b46d90bdd10872ea55af0372bfe3c563c0c95c6e1a30f66c
font_01_sfnt_off00011cef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013506.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13506 11208 bytes
SHA-256: 0dc28c19e6bfa6ad179c3488417c55ab885f1ba5087aab69ac4eb47a88df85b5

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