Malicious PDF — malware analysis report

Static analysis result for SHA-256 55578a35917baac3…

MALICIOUS

PDF

87.6 KB Created: 2021-08-14 18:43:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fffbae4820de108f3f19d158c8341785 SHA-1: d78343b695a55275ed2f11db5a8d7524a3fa0798 SHA-256: 55578a35917baac3080c3a1b886f9660bed2247345f357160bdf7303c4a4075f
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://kryotherapie.net/neu/userfiles/file/64470398214.pdf In PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/249d78dd79be1bce4fcc8ad63d22cce1/notujukesit.pdfIn PDF document text
    • https://stcc-sa.com/motakamel/Ups/files/zawazu.pdfIn PDF document text
    • http://caudafotografia.com/userfiles/files/kiturubulamuxaroginulu.pdfIn PDF document text
    • http://canxetaidientu.com/images/file/tidumexomabofuvefabuzomij.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/ssliqn4rtn85rrm5i7p3td5c54/4236690182.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/vasapuvamumadu.pdfIn PDF document text
    • https://unaizahic.com/Files/files/xafaxiwowemitejuvij.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/96128380915.pdfIn PDF document text
    • https://renebeumer.nl/userfiles/file/92179492489.pdfIn PDF document text
    • https://bravo-hk.com/userfiles/file/kuvopagopane.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/004358b176f0dd902c326dc7c61ca5bf/60642960587.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/2f41744f61ea9b5cb252e597cac4354b/fanuzix.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607edcd2d4d67---vunomajitatopexofaganufun.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/dccdc46f31bffe98695672e806b1e250/17407104457.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7ff549c92---xavisizulagorozurixa.pdfIn PDF document text
    • http://smeeing.com/userfiles/files/8079878970.pdfIn PDF document text
    • http://bean2beenefamilytree.com/clients/60578/File/kiziro.pdfIn PDF document text
    • https://pearproperties.in/userfiles/file/xumigu.pdfIn PDF document text
    • http://artattack-concerts.de//files/file/guzakokuro.pdfIn PDF document text
    • http://vendsol.com/userfiles/file/wepigijol.pdfIn PDF document text
    • http://klasykarozrywki.pl/public/images/fck/file/kibinakofevadikidaxun.pdfIn PDF document text
    • http://aitrans.cn/UploadFile/file/F1202108110730097476.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/tapuzilogusuferivudabafaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=best+buy+carding+method+2019PDF 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_off0000efa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000107b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B8 17020 bytes
SHA-256: be2c8c296373ac6b0b113b3d9aa7fa6f2aea150af7b7853fe04d9111ed00c696
font_02_sfnt_off00013442.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13442 11640 bytes
SHA-256: b3bd0f28c08e8cd0d3d04f5d1195d23b866a4becc923970222f4b0e4d2152457

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