Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7d878cd93e46a6a…

MALICIOUS

PDF

74.6 KB Created: 2021-09-28 19:05:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2af30c4e8e3e35caac8708d3a989544d SHA-1: 7ed4c0202a632c791bb6ea9047a8e2f4558ffb10 SHA-256: b7d878cd93e46a6a1a02317937e3894dad1b31d1910e40df0c75852389855ae7
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to domains associated with link farms and potentially compromised content management systems. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated, preventing a clear understanding of its direct user-facing content, but the heuristic firings clearly point to a link-farming and potential exploitation vector.

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 https://drafthe.ru/uplcv?utm_term=raft+wars+2+friv PDF link annotation
    • http://qazaqbanki.kz/data/content/files/setesogeberizetimerebazo.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161384f51c1d15---rifuginaziv.pdfIn PDF document text
    • http://ttfi.org/app/webroot/userfiles/file/89382412986.pdfIn PDF document text
    • http://i-daa-wl.de/userfiles/67189294365.pdfIn PDF document text
    • https://onutglen.com/caningest/images/file/9861197165.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/38915133253.pdfIn PDF document text
    • http://plkorea77.com/ckupload/files/88937790679.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/39f5cf0b633846a37b7cde74c0d947ce/xumus.pdfIn PDF document text
    • http://mitcostruttori.it/userfiles/files/14434690393.pdfIn PDF document text
    • https://medicabg.com/uploads/wysiwyg/files/pulizovixapi.pdfIn PDF document text
    • http://ncdesign.it/userfiles/files/mefonaregelanid.pdfIn PDF document text
    • http://kingkady.com/uploadfile/files/fofadaloxexipuviwo.pdfIn PDF document text
    • http://lingeriedediva.com/UploadFile/file/2021090810034473499.pdfIn PDF document text
    • http://autodilykanka.cz/cmsimple/images/file/datoxugigem.pdfIn PDF document text
    • http://prestinoequitacion.com/imagenes/upload/files/sixulesojos.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/62239e25294e1e9a4406b4c9ed039ad0/gozuranelalegemaxopitul.pdfIn PDF document text
    • https://www.assofmt.org/ckfinder/userfiles/files/vivatunudisawadudonajobof.pdfIn PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/68235738794.pdfIn PDF document text
    • https://bisleriuber.genefied.co/ckfinder/userfiles/files/malamowovubivir.pdfIn PDF document text
    • https://global-product.org/CKEdit/upload/files/10475558874.pdfIn PDF document text
    • https://sapporomn.com/userfiles/files/93464539692.pdfIn PDF document text
    • http://www.klccpa.com/userfiles/file/In PDF document text
    • http://uitvaartverzorgingsindex.nl/images/uploads/59301949436.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_off0000beac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d6c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C3 10124 bytes
SHA-256: e07a4152d5af5cadd5bbceb481a55798deabc462f4a785aae0de98858013a0fe
font_02_sfnt_off0000ed93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED93 17756 bytes
SHA-256: 673c6e93b091113ad33997f0d36658e9b221f2189906251a614e62e5e562fa00

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