Malicious PDF — malware analysis report

Static analysis result for SHA-256 c81ffb16544a6e96…

MALICIOUS

PDF

83.0 KB Created: 2021-09-06 21:26:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: fcdb4ce9e1f459837d89035f3afc3240 SHA-1: 1c63e12f3629f3789abb47b10ebfe4560680bbfb SHA-256: c81ffb16544a6e96861f603959ccd1c1c7a8644cf610f2a1df7794daf899efa4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs pointing to various websites, many of which appear to be compromised CMS upload directories or disposable domains. This structure strongly suggests a link farm designed to lure users to potentially malicious sites, likely for phishing or malware delivery. ClamAV detection and ML classification further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://allytemp.ru/uplcv?utm_term=mora+piritha+sinhala+meaning+pdf PDF link annotation
    • https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/f09b0eb63f593de8ec849647b2a83393/98482892142.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/p5p87sc9su6mrhtbd7pi2iqaji/57981265489.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/diduzaxunefisap.pdfIn PDF document text
    • http://holidayinntorino.com/userfiles/files/67085218129.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/9edebc818d32f5e4b42a07f153b78d8f/kopijadebukexadif.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/65678276846.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/tejoboniwivazeno.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/lbhutnhbc7o1lnmbghntkea6b7/kobodorosug.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610297a14c8f0---jukerujepibuwov.pdfIn PDF document text
    • https://www.cascatai.com.br/ckfinder/userfiles/files/38928598983.pdfIn PDF document text
    • http://vimbark.sk/editor_uploads/files/63669199679.pdfIn PDF document text
    • https://fourseasons.events/wp-content/plugins/super-forms/uploads/php/files/a09ea0347157990bf8bcf01f1ce6c7d3/22947743588.pdfIn PDF document text
    • http://4grd.com/cmsimages/file/nudozefukado.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///disegikelejoxiworonuj.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/morejeriwogewaromosoxez.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/73591885626.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/ad9368b12318babb3de533f0f8d080ad/jefejavuwepud.pdfIn PDF document text
    • https://chokysitohang.com/Uploads/userfiles/files/23150937787.pdfIn PDF document text
    • http://stringquartet.biz/web/images/fck/file/38583494290.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160e3a5066240c---48761092459.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/digonu.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b6b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cecc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCECC 10940 bytes
SHA-256: 4f733db9e9bd9436d73beb5478f8821f54f6f1e2ebf5f19d8724fbbff4511322
font_02_sfnt_off0000e7b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B9 16452 bytes
SHA-256: 1466ac529516c27f76455987fcac8bf81770f9aff538e9dcb8f7091f2f8d5867
font_03_sfnt_off0000fe83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE83 1996 bytes
SHA-256: d5ba0c876639711cb385a42c385dce711d721e39652b0aaec4d843023222f492
font_04_sfnt_off000107b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B4 20676 bytes
SHA-256: a7b9138defdd0cf25ca767f0b340ac727226875f3e344ce71e491cb1d8d741d0

Open this report in the interactive analyzer, or submit your own file for analysis.