Malicious PDF — malware analysis report

Static analysis result for SHA-256 72c073f40a37f480…

MALICIOUS

PDF

81.2 KB Created: 2021-09-18 05:56:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8c52231fae0b2dd132c7d4929b3331e4 SHA-1: 6801234ce4efeda76c8c9ec3d8fa70e97a4f3a37 SHA-256: 72c073f40a37f480a380984eda487d6128d3320a1562acc0c2870a78e246d339
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that function as a link farm, directing users to external sites. Several of these URLs point to compromised CMS uploads or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or delivering a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://infrive.ru/uplcv?utm_term=kissasian+apk+download PDF link annotation
    • https://hlj-vibration.com/uploads/image/20210915/files/20210915162138.pdfIn PDF document text
    • http://fertilityupdates.com/userfiles/files/devigagamijal.pdfIn PDF document text
    • https://gallerylingard.com/uploads/file/87409674990.pdfIn PDF document text
    • https://autopsrus.com/ckfinder/userfiles/files/kegotew.pdfIn PDF document text
    • http://www.cerel.eu/images/wyswig_images/file/fijiro.pdfIn PDF document text
    • http://lakesnwoodskerala.com/uploads/file/kisawuvademosub.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/3db4190fdc8e76aa80e13061ef72daf1/nikozevomuzevonulaxijotok.pdfIn PDF document text
    • http://szkolaprzybranowo.pl/ckfinder/userfiles/files/nugejepujopumalob.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/f8d9c92eda5418c0ca63e0a30fb85379/sewebabosigivoterasu.pdfIn PDF document text
    • https://nepalipublisher.com/ckfinder/userfiles/files/56930225453.pdfIn PDF document text
    • http://e-restauracion.com/app/webroot/files/uploads/files/nogamirusuxuvomunikopobad.pdfIn PDF document text
    • https://confeccionesruiz.cl/UserFiles/File/97243949144.pdfIn PDF document text
    • http://hongdacable.com/d/files/mizoketo.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/89126239807.pdfIn PDF document text
    • https://doublehaircenter.com/upload/ckfinder/files/zejinevagitugaromek.pdfIn PDF document text
    • https://aradmissions.com/ci/userfiles/files/37414362563.pdfIn PDF document text
    • http://jumpstart.mobi/userfiles/file/20589663291.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/3471e3a3db543ca1b2595e5091dc6c5a/46851805300.pdfIn PDF document text
    • https://svetplus.com/userfiles/files/koromi.pdfIn PDF document text
    • http://autoneza.cz/UserFiles/File/60538259518.pdfIn PDF document text
    • http://kimbuunguyen.com/uploads/userfiles/file/84758000520.pdfIn PDF document text
    • http://fpole.ru/sadm_files/46241399167.pdfIn PDF document text
    • http://ideatity.com/ckfinder/userfiles/files/kivefomalimedosore.pdfIn PDF document text
    • http://formpart.com/upload/ckfinder/files/68748351815.pdfIn PDF document text
    • https://anyimaker.com/upload/users/files/88523849131.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_off0000d7f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f004.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF004 19004 bytes
SHA-256: b35d7870a2283165449a03d351e33131137aa7ea21ecd430b5e8e58626a1ab1c
font_02_sfnt_off0001200b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1200B 10224 bytes
SHA-256: 954af651a82c55229822f142716ba176a7bf55e90e8ca18071b59dcc54074a3f

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