Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffbcf76a5f53fb33…

MALICIOUS

PDF

83.5 KB Created: 2021-09-20 13:19:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4460d0fe0ce9ef50cb71f15a152d572d SHA-1: 2ba9cc6895dba1c3bdd5ecbd9802b838cff45fa5 SHA-256: ffbcf76a5f53fb33fe663218aa061a0782dcafd98a8e5c536ada2aebcdb64bca
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 compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of external URIs and link farms points towards an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://ketchas.ru/uplcv?utm_term=12+digit+voucher+code+ps4+free PDF link annotation
    • http://eortak.com/img/fck_temp/file/71193036174.pdfIn PDF document text
    • https://eco-translation.ca/upload/editor/file/difabalupinonosij.pdfIn PDF document text
    • http://pieseclimaauto.com/files/file/bujejizarixo.pdfIn PDF document text
    • http://breakevenpoint.pl/uploads/editor/file/23796523870.pdfIn PDF document text
    • http://zeci.nl/im/image/kivopamabimu.pdfIn PDF document text
    • http://abogadosaguilar.com/ckfinder/userfiles/files/rukuzemiteguri.pdfIn PDF document text
    • http://dentalclinicbangalore.com/uploads/70330102974.pdfIn PDF document text
    • https://menokatea.in/ckfinder/userfiles/files/46920917585.pdfIn PDF document text
    • https://cbdc.co/uploads/ckfinder/userfiles/files/59246351180.pdfIn PDF document text
    • http://uts.edu.co/portal/app/ckfinder/userfiles/files/tifipaluge.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/files/87111982888.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146625fb1a86---gefixijoxiwunuxibozeg.pdfIn PDF document text
    • https://majubesar.net/contents/files/67391260511.pdfIn PDF document text
    • https://stradatextiles.com/upload/ckfinder/files/35799365110.pdfIn PDF document text
    • http://test-immo.com/file/narujaxun.pdfIn PDF document text
    • https://galedo.cz/www/data/cms_files/files/21538343534.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/4a0ccc1c482ffa1516fd1adcea432220/xowejomufaxulutusifuwadi.pdfIn PDF document text
    • http://ndc-group.ru/uploads/files/tuvuzofezasidi.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/161397dff9747e---49075107794.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/lh54p9t6rvi1dieg5u98m56a10/98054546644.pdfIn PDF document text
    • https://pasationtravellers.com/root/FCKeditor/file/1997701126.pdfIn PDF document text
    • http://crystal-lamp.ru/uploads/files/vupofu.pdfIn PDF document text
    • https://www.aukuras.org/ckfinder/userfiles/files/66400991886.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_off0000e00f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE00F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f826.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF826 10904 bytes
SHA-256: a89a3840272da0da220648304310c901ad46717701b8332d888585c9ac38cfab
font_02_sfnt_off0001117a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1117A 18248 bytes
SHA-256: 1a9b6bfae86613932b7323401cdb732105310b0b6f2f00fa61f242f767739a72