Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fb385f557e24609…

MALICIOUS

PDF

79.3 KB Created: 2021-09-18 03:52:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5e00cb6be94e6f8181eeb84111dc1e77 SHA-1: aed98cb29d1c0b6d277b018984be05452a472371 SHA-256: 4fb385f557e24609d635f47f036770526873523e9d302fc72301f601686e8bd2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and link farms pointing to various domains, suggesting a redirection mechanism to potentially malicious content. The presence of a 'download button' heuristic further supports the idea that the document is designed to lure users into downloading or accessing harmful resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://archism.ru/uplcv?utm_term=lollipop+system+ui+apk PDF link annotation
    • http://planbmedia.hu/files/musumokikewijofen.pdfIn PDF document text
    • http://sitarofindiamd.com/userfiles/file/nilukewelulome.pdfIn PDF document text
    • http://emilybarnes.com/DEVELOPMENT/VERSIONED/emilybarnes/trunk/sites/default/files/file/fewaneripudufegep.pdfIn PDF document text
    • http://2015.letnifestiwal.pl/ckfinder/userfiles/files/1813267530.pdfIn PDF document text
    • http://scsychem.com/upload/files/69282659468.pdfIn PDF document text
    • http://brandiassociati.it/userfiles/file/64495176778.pdfIn PDF document text
    • https://jsptti.com/ckeditor/ckfinder/userfiles/files/vudefi.pdfIn PDF document text
    • http://dastone.ru/userfiles/file/17183791198.pdfIn PDF document text
    • https://traveletrust.com/basefile/traveletrustcom/files/99277491197.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/wilobaguxefabem.pdfIn PDF document text
    • http://taxfreepoint.com/file/pidazopomoriwap.pdfIn PDF document text
    • http://www.petersonassoc.com/emailimages/file/sefolitunedotaxunivemov.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140e815a8404---47247123704.pdfIn PDF document text
    • http://s2ipower.com/survey/userfiles/files/xupowupufujuxunarebu.pdfIn PDF document text
    • https://vhcvietnam.vn/ckeditor/images/files/13933246750.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/16130a4543cf43---9195927153.pdfIn PDF document text
    • http://mertcelikkapi.com/userfiles/file/60954339004.pdfIn PDF document text
    • http://ohxto.com/uploaded_files/userfiles/files/busikuwesaselenifofevox.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131fdc840944---20525152401.pdfIn PDF document text
    • http://emilybarnes.com/DEVELOPMENT/VERSIONED/emilybarnes/trunk/sites/default/files/file/gijotawaletalesutevurege.pdfIn PDF document text
    • http://elazentrale.de/images/uploaded/file/tureresuwon.pdfIn PDF document text
    • http://monticellotownship.org/userfiles/file/xorof.pdfIn PDF document text
    • https://mlbcsimleague.com/ckfinder/userfiles/files/jowomemofunilebujiv.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_off0000cf87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e79e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE79E 10472 bytes
SHA-256: 367147f348ef73606d54f3b91250863e7fa1cbd0b9098ff578ebfb55338c22bb
font_02_sfnt_off0000ff84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF84 18596 bytes
SHA-256: b6e7347dd0c18db82dadb4965fce1f54f6f270680c033197ea27eb1892eda42d

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