Malicious PDF — malware analysis report

Static analysis result for SHA-256 b426329d3634e860…

MALICIOUS

PDF

76.4 KB Created: 2021-09-13 21:56:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 12bfb43514f2070eaa86a355ed090b10 SHA-1: 32f817de8829a371df101ffa0620c852cc7d890c SHA-256: b426329d3634e86075bbaf5d7c4a8d36bc906b7d3b58d276edc228a02f1795ee
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning model also indicated maliciousness. It contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content or redirect users to phishing pages. The presence of numerous unknown URLs further supports this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/2c40921c09b10160e644fb4cf671554c/mitavir.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161314ad096bf6---zopifujekavegikotixepo.pdfIn PDF document text
    • http://tieulongcopro.com/luutru/files/19923997365.pdfIn PDF document text
    • https://nabil-doukali.com/userfiles/file/60535988976.pdfIn PDF document text
    • http://bunny888.com/ckfinder/userfiles/files/9055494905.pdfIn PDF document text
    • http://matras-devison.ru/upload/file/9289290334.pdfIn PDF document text
    • http://suliaok.com/v15/Upload/file/2021910628219489.pdfIn PDF document text
    • http://keletunderground.hu/images/uploaded_pics/file/wafozeji.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/p6obnj22ossu28p7o3qjooul3p/pederur.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/somatuzajiwigilefakixov.pdfIn PDF document text
    • http://otestmanager.org/club/data/userfiles/file/20210911043759.pdfIn PDF document text
    • https://hippodrome-compiegne.fr/www/uploads/file/beburebiwowogosup.pdfIn PDF document text
    • http://magdrywall.com/project-new/christianbook/upload_images/file/futefoneripuda.pdfIn PDF document text
    • http://purplebyanki-com.bvirani.com/ckfinder/userfiles/files/9822113181.pdfIn PDF document text
    • http://frankifoto.com/uploads/pages/files/24301061295.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/6bbb8ec5051b5ca0aea9e9e91a479b54/75080451366.pdfIn PDF document text
    • https://www.lipca.com/ckfinder/userfiles/files/vibibawosaxanusivojuta.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/pexiluvodixoledet.pdfIn PDF document text
    • http://studiobonvino.com/userfiles/files/fukututejazupaw.pdfIn PDF document text
    • http://vaonhaphatphap.com/images/uploads/files/tuvupoxepoxidajuzijedebeg.pdfIn PDF document text
    • http://cross-winds.in/upload/contents/images/images/mowimaboxukazolofexinude.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+add+emoji+in+keyboard+androidPDF 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_off0000c746.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC746 17132 bytes
SHA-256: bf59029a8f8f1f3cf5743a08139b408def17f5e8fba41204859a127dbe9a5de4
font_01_sfnt_off0000f3dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010bf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF3 10748 bytes
SHA-256: 935669b3753bb269b41da31fe026ccd3dedb022912f730cd783c48b73f7723af