Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff2e9a9e5eeee080…

MALICIOUS

PDF

77.1 KB Created: 2021-09-05 05:56:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6233e2c99438e4a3768a107b58fc64a5 SHA-1: 5e81a22e3a05a76e25c510df99919b012fc78817 SHA-256: ff2e9a9e5eeee0800df74d77d4da77b1e53a5b22838732d7e2e6e723af0bc2e0
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm with numerous URLs pointing to potentially compromised websites, suggesting an attempt to redirect users to malicious content or phishing pages. The presence of multiple external URIs and a link farm indicates a likely attempt to exploit users through deceptive links, possibly as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/17383d96846457e63640187a12a2c3f3/natuwodunininidudofasupuf.pdf In PDF document text
    • http://uhy-th.com/image/upload/files/ketutejutugole.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/lawojefurolovuguf.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb4ac02c98---54073518268.pdfIn PDF document text
    • http://bandenplaats.nl/cmsimages/file/pekuna.pdfIn PDF document text
    • https://marcuspietrek.de/MARCUS/files/file/zaropelorolaxefajabufu.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/1690756584.pdfIn PDF document text
    • http://89928386.com/uploads//files/202108041641298253.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160d626f2d4bea---guvifunakiki.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b851493ab9c---leritigid.pdfIn PDF document text
    • http://lexen.ca/userfiles/files/majukofivaxepenidumeb.pdfIn PDF document text
    • https://cihangirhotel.com/upload/ckfinder/files/jaxumegojutedagu.pdfIn PDF document text
    • http://hopkinshigh1966.com/clients/1/10/1054c114374c88b4a165e91103565d41/File/mipawekojekifatawebe.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608c6d98dc4c4---lupixibupaxedawaporeb.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d5c7112d9d27355741b2f95addb4f7b1/105149283.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/tobob.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a467df3ae3---58801290794.pdfIn PDF document text
    • http://jobsandhi.com/uploaded_files/userfiles/files/merudakujobejipogigato.pdfIn PDF document text
    • http://ondrejkocar.cz/img/file/ranasiz.pdfIn PDF document text
    • http://syntrend.critical.tw/upload/files/4485331806.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fbf27b1aa7---viviponuwidamepadiv.pdfIn PDF document text
    • http://www.biotanika.pl/upload/file/mivemavarolagapibewo.pdfIn PDF document text
    • http://allycatering.com/userfiles/verutidogasajo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=blood+smear+preparation+and+staining+pdfPDF 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_off0000c9f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9F7 17100 bytes
SHA-256: bcac7ebd78252e361c832980a83745e07d9bf80124aefd2a484c0280e0114f9d
font_01_sfnt_off0000f5f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E08 10892 bytes
SHA-256: 429c1e5789ebbeaa62c04f9a4045de8a2a6e10c91e382db0f3eb93b3ffcb80ce

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