Malicious PDF — malware analysis report

Static analysis result for SHA-256 b964d3e4ce1a5839…

MALICIOUS

PDF

79.7 KB Created: 2021-09-17 01:45:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 391402b46c6f018e8b9d112a1872663a SHA-1: 8d1c963f941c163d5b8a15f09a711002c63ec6cf SHA-256: b964d3e4ce1a58399c16e78874cd2dd32f10f289d982a483169f38b55f2c7ca2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution attempt. The heuristic 'SE_INVOICE_LURE' indicates the document's content is designed to mimic an invoice or payment request, further supporting a phishing attack pattern. The ML classifier strongly flagged this PDF as malicious, and ClamAV also detected it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://inwebjor.ru/uplcv?utm_term=request+for+work+completion+certificate PDF link annotation
    • https://marwaservicecenter.com/nbloom/fckuploads/file/24296695593.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/43cfcb5976c8e474f773cc757de89e25/65879807539.pdfIn PDF document text
    • https://armour-technoz-ca.otzol.net/ckfinder/userfiles/files/mubipemukugit.pdfIn PDF document text
    • http://vinabomi.com/uploads/userfiles/file/98574784685.pdfIn PDF document text
    • http://cattaneoarchitetti.it/userfiles/files/80107550211.pdfIn PDF document text
    • https://cr2tek.com/userfiles/Proj_Name/files/25660364264.pdfIn PDF document text
    • http://lexxyin.net/files/fckeditor/file/96373473601.pdfIn PDF document text
    • https://syteq-pro.com/userfiles/file/rivuluv.pdfIn PDF document text
    • https://vargyasnekonyveles.hu/kepek/other/file/gokopidowubupupunokuzo.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613d8b2d6d068---28005937341.pdfIn PDF document text
    • https://houstoncoinclub.org/FCKeditor/file/wemofotu.pdfIn PDF document text
    • https://termokingbt.com/ckfinder/userfiles/files/65701081512.pdfIn PDF document text
    • https://valenciamaids.com/userfiles/files/zofatugirenuvodesixado.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/16141f8ff5a0f3---defabiwojufaset.pdfIn PDF document text
    • http://rlponder.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/10801851792.pdfIn PDF document text
    • https://wittnebel.dk/file/nuxasirunarexinor.pdfIn PDF document text
    • https://www.privathospitaletkollund.com/ckfinder/userfiles/files/81954063662.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613e672aea3ac---13871030620.pdfIn PDF document text
    • http://fishtech.org/uploads/userfiles/file/file/72380904942.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210903001027560.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/59fbe27d3db2c707efc480921a97dec3/47853313063.pdfIn PDF document text
    • https://intrigantka.ru/images/userfiles/file/35507469805.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_off0000d337.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD337 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB4E 11112 bytes
SHA-256: 894f6741e2d6d914f4f15d36b05a8f8c60808124d1e13f4e906ce25e44fa3631
font_02_sfnt_off00010549.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10549 16928 bytes
SHA-256: 9ccdf689c0391a8356d3f290fd8dc56518ea2e3050bf8e22600bac6875bca854

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