Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b098695e7c800d1…

MALICIOUS

PDF

81.4 KB Created: 2021-08-24 13:27:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1f1b1d7eda3c387ce428c82114a23d6d SHA-1: d483218da5c5f044a77435f0ec9802eeee22fbb5 SHA-256: 8b098695e7c800d1567c82d4799ca5538af32809c5cc6df17a17bdac3e8033d7
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to compromised WordPress sites and other domains, suggesting it functions as a link farm to distribute malicious content or conduct phishing attacks. The presence of multiple external URI heuristics and link farm indicators reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://crysiq.ru/uplcv?utm_term=how+to+install+fortnite+patch PDF link annotation
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/40ee0e0586b55b067f1ee76910481953/daxitesabezimema.pdfIn PDF document text
    • http://hayatteknoloji.com/webimage/file/zawupubiniwerojorulosolu.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/c1c5ef1ab068965a2261828a6035bb05/tedasutawimizufesipo.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/2234ae0d5bd5e2ea5cea9c25751c7087/sepuwijuvegasava.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/26eba3e891f9c21e2de4691b856b3b01/40793292825.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0f89a1b8fe---bojawekideta.pdfIn PDF document text
    • https://clubforeducation.com/FCKeditor/userfiles/file/27806946630.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/380d658800588fdff00f4261bcfbfcc4/malizufowonuwenave.pdfIn PDF document text
    • http://masonfamilyreunion.org/clients/b/bd/bdaf0a3c19eb5f10f0519c747c117e37/File/36764524026.pdfIn PDF document text
    • http://daoltrading.com/userData/board/file/71556740948.pdfIn PDF document text
    • https://yuvasarkar.org/userfiles/file/32490713896.pdfIn PDF document text
    • http://immobilieninvestors.eu/userfiles/file/zefuserajatoripubalodim.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160906ea0804f9---98716411681.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/33628484018.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/hokr629j4epnt9b64mb6rteo06/buxomezomitesijotupofen.pdfIn PDF document text
    • http://24cvety.ru/upload/files/xepajobefajategizeboz.pdfIn PDF document text
    • http://brilsports.ro/userfiles/file///ragotawobitup.pdfIn PDF document text
    • https://kovtec.pl/eurostyl/photos/file/pufofeligatabew.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/5bc22d0cf9979d150fb53c4b9efdb6d0/fulubasurewuwu.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611705a68e89c---20444569160.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be85b6280c8---25744289341.pdfIn PDF document text
    • http://linpus.com/app/webroot/userfiles/files/68845717200.pdfIn PDF document text
    • 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_off0000daf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF8 16508 bytes
SHA-256: 22304407491756386245200360e4cd9f6946a7adb8868330daf5e28c58950156
font_01_sfnt_off000105db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105DB 10652 bytes
SHA-256: 0ee8479ea696b0f15a43904d9731ee6fd53decedba36d512ecfa89483b5f081a
font_02_sfnt_off00011e38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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