Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8bb76b847eca86e…

MALICIOUS

PDF

83.1 KB Created: 2021-09-15 14:51:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 09892d2623fa4d0b4a0cf569e7c2c4e7 SHA-1: ab10280fad5fa81e52860e973d5b763a352cb419 SHA-256: d8bb76b847eca86ec1fc6016b83457aa43d688710831c4666ed56101fddc7854
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://esipro.lu/userfiles/file/45391637569.pdf In PDF document text
    • http://nuitsdartistes.eu/images/file/84107350816.pdfIn PDF document text
    • http://sithome.com/upfiles/file/20210901092354.pdfIn PDF document text
    • https://villamishkan.com/310renonew/front/images/files/46903871639.pdfIn PDF document text
    • https://zzhqhi.com/d/files/bizuxipibiz.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16136f1f313b7a---wukobemugafirozugula.pdfIn PDF document text
    • http://tlumacz-bialystok.pl/pliki/file/zapagowasuridase.pdfIn PDF document text
    • https://ijaetis.org/ckfinder/userfiles/files/8414084442.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614095a3c1a3f---23754758664.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137bc886e793---lesijad.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16141441d8e496---wonedojilavuwe.pdfIn PDF document text
    • http://topup-fight.com/ckfinder/userfiles/files/jeloreketimore.pdfIn PDF document text
    • https://avukatwebsitesi.trakyasoft.com/upload/files/97566600080.pdfIn PDF document text
    • http://lepetitjaunais.com/userfiles/file/76442608670.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613798e0c3fc8---36715971917.pdfIn PDF document text
    • http://live-lessons.net/lcj/web/uploads/assets/file/79403392615.pdfIn PDF document text
    • https://groupekheidri.com/ckfinder/userfiles/files/burefabanifizimi.pdfIn PDF document text
    • http://gillsandgeckos.com/userfiles/file/wemib.pdfIn PDF document text
    • https://karlholmbygg.se/UserFiles/files/98105890454.pdfIn PDF document text
    • https://sfeerweter.nl/userfiles/files/tokoderedamudasa.pdfIn PDF document text
    • http://tw-echen.com/uploads/files/202109112311099179.pdfIn PDF document text
    • http://mtsskzy.com/userfiles/file/tovugidikix.pdfIn PDF document text
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/nemubuwarinezililorelavu.pdfIn PDF document text
    • http://liveisagenix.com/ckfinder/userfiles/files/besis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=best+printer+app+for+android+2020PDF 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_off0000e067.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE067 17524 bytes
SHA-256: f72f374f6ad04c06cf2ba5da7dc324514088355ae00ef3bd5fae44e198eeacfd
font_01_sfnt_off00010dd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000125ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125EC 10740 bytes
SHA-256: 367754a1ea84e9164f19c964e82e95dc06463567207891345463a39f3ea52798