Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b4d0f3ef8f03f38…

MALICIOUS

PDF

86.3 KB Created: 2021-09-01 04:17:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 41e8befa642edbe4a4ca53f93a6c6ef1 SHA-1: 180e8ef042f4bd13caea77c643105b27859318b1 SHA-256: 4b4d0f3ef8f03f38cd76ed0e29e4faedb725b9237ab2ccb6c82ca5df6d57953e
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, 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 external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://novastal.pl/userfiles/file/zawizunanovusakebixut.pdf In PDF document text
    • http://ganteltechnology.com/system/userfiles/file/vamabivejijumijaxija.pdfIn PDF document text
    • http://papaicountrylodge-longstay.com/user_img/files/2756246829.pdfIn PDF document text
    • http://xn--2-140-swe8h.xn--p1ai/files/95683928412.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608bee280325d---9828290690.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/pojalezibivodepa.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/b608175f3c3f96d6b5db6ba48cbf8421/11109271854.pdfIn PDF document text
    • http://midel.me/userfiles/file/lajelijexonoruwuxo.pdfIn PDF document text
    • http://childconnect.com/swi/fckfiles//file/dekasamogetininenenoboba.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/91308a4788328824f930b89d4ef31b57/podub.pdfIn PDF document text
    • https://zahnersatz.pl/userfiles/files/71477247934.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/7hmk8f8b4t5sup3d4qk4jvsps5/15094976307.pdfIn PDF document text
    • https://www.bistro-e.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b56e2885be---wokaduwegoj.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/81486088800.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/ad87e80e00333b28abf481e74bb0ea2e/fazebo.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160870c6482261---xowave.pdfIn PDF document text
    • http://boeschfamilytravels.com/clients/43210/File/65202366370.pdfIn PDF document text
    • http://ambulatorioveterinariorigolon.eu/userfiles/files/65775458645.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/93706852337.pdfIn PDF document text
    • http://www.flamanville-76.fr/upload/file/lumilokezatedunexaxiniji.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eb18dba9b8---jaregazil.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/89077263675.pdfIn PDF document text
    • http://aaronandanthony.com/userfiles/files/jekorigivipamefamud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=fast+and+furious+all+movies+downloadPDF 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_off0000ecd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD9 10744 bytes
SHA-256: 2d7cf23d77b9e28d23abba35bee0a9053de047d5de0e1ed57562f79b28719142
font_01_sfnt_off00010591.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10591 17836 bytes
SHA-256: 93eb9ed0bc915881e137e4981c5a6662ef530f06bc7db3398802de6ac57bf8d6
font_02_sfnt_off00013395.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13395 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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