Malicious PDF — malware analysis report

Static analysis result for SHA-256 dae53b4e3616222e…

MALICIOUS

PDF

73.3 KB Created: 2021-09-03 17:33:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f01ba5a32ee297d9f6759e49848a92f0 SHA-1: 69ef4b0271d85b9861c37d1da53d7b7b8acc4938 SHA-256: dae53b4e3616222eb80f25637e0e680fec32a47d3e0bd9a461ec2192c78e930c
164 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS upload storage, suggesting it's designed to host and distribute further malicious content. The presence of a 'download' button lure reinforces the phishing or social engineering aspect of the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8e85694e8---rodupizunepezikirarajoru.pdf In PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612060dcdac34---21386843793.pdfIn PDF document text
    • https://weyergans-hcc.lv/userfiles/file/28488961717.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096a78673078---wigixaxafetonib.pdfIn PDF document text
    • http://stamforgtechnologies.com/uploads/fawetumuwiwudulofiv.pdfIn PDF document text
    • http://mascotdd.com/file_media/file_image/file/pebodedexoxududikut.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16087c9ee8d150---39990979683.pdfIn PDF document text
    • http://cementfeet.com/userfiles/file/12812031906.pdfIn PDF document text
    • http://zvezda-rostov.ru/ckfinder/userfiles/files/69622592016.pdfIn PDF document text
    • https://12shio3.com/contents//files/gekesux.pdfIn PDF document text
    • https://fanaf.comarticle_ressources/file/fivot.pdfIn PDF document text
    • https://greenfuturevietnam.com/Upload/files/sizatogabafezoxabij.pdfIn PDF document text
    • http://pattarasawat.com/ckfinder/userfiles/files/soxukuxigaxutogedalul.pdfIn PDF document text
    • https://censcakmu.org/board/file/files/mupajowo.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610ea2ae26780---palagulupitilozizexekubu.pdfIn PDF document text
    • https://badrivishal.com/media/72450012487.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160882a1ab2776---mozixiz.pdfIn PDF document text
    • http://boldogelet.hu/media/webamekogofewuzuren.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/tidivifivegugulipex.pdfIn PDF document text
    • http://shsclassof1959.com/clients/a/a7/a7a82b2a6025f7fafce5d77be70bf845/File/besovolavuwebotorirup.pdfIn PDF document text
    • https://fundreamz.com/ckfinder/userfiles/files/17756873254.pdfIn PDF document text
    • http://sylvianapoles.com/clients/e/e6/e63d90d46a840f0b3195f531cec11f6e/File/sulufejekizesefuxaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=ascanio+in+alba+mozart+pdfPDF 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_off0000bb99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d3b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3B0 10832 bytes
SHA-256: 3370d992b2d3b9b83d8629840d0fbd25565cddaaace42ae80e7384f52394ec2f
font_02_sfnt_off0000ec80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC80 16672 bytes
SHA-256: ec22687ba04bdeea71df559cb3a1f4e07aad26ea2899cd998c3f0ed6c7ac4cd4

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