Malicious PDF — malware analysis report

Static analysis result for SHA-256 6af2ca4a0934bca1…

MALICIOUS

PDF

92.4 KB Created: 2021-07-16 03:15:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: f7d8f7ccdf48e50b6bd5f366a4f5658b SHA-1: 22c44699074b1a040f260d5ea20bdf8463556be2 SHA-256: 6af2ca4a0934bca1f5f43eb5ed2cdd7dda87f206c6c32c60043aaebef05fe0f0
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites. These sites host further PDF files, suggesting a multi-stage attack or phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608356f684e12---24707570594.pdf In PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/c7149564f7d94285e147adf10327d33e/26373875817.pdfIn PDF document text
    • https://riolospettacoli.it/filesUploads/file/taxiz.pdfIn PDF document text
    • http://fewo-spreewald-schoetzigk.de/brandenburgtag/img/editor/file/ludetorogukadufijanuzowi.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/b8o267edg31b25s4prjt32opgm/rimevewatuvafanibujovuso.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/6mmobblkk5g1b47gt47oh9rkk6/92286571301.pdfIn PDF document text
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/3b677f342caaefd04dff364d5f22c14a/nunuzarutuzo.pdfIn PDF document text
    • https://miaousland.fr/ckfinder/userfiles/files/1606847526.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/jelakesanugugazasim.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/foxutol.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a5d703247d1---82540271491.pdfIn PDF document text
    • http://orderleesushi.com/uploads/files/tosib.pdfIn PDF document text
    • http://radissonhoteltraining.com/userfiles/file/56012230534.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ca7b65038e---bukezugepulogani.pdfIn PDF document text
    • http://t-p-fortune.com/userfiles/file/53763915918.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/ebd280724d057cb4d56a1b88ce2b8c3a/45589881596.pdfIn PDF document text
    • http://hasici-pristroje-eshop.cz/files/file/lofupotezutakofobaje.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/776c3739a2fcf821a802b0d924a6c180/tejalogovukami.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/714a38efbaf5ecd684b86df89ebffc11/7513129748.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/dd328eee1b5e86d222f7a2246d2acaa9/53746519429.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/cebfd6d295c07fb2ee541e777608bd5d/79037446017.pdfIn PDF document text
    • http://shsalumniauditorium.org/clients/f/fa/fa32e32112b7cad64a7d7e78b95ed61b/File/44645825510.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a285c7e6a66---53583792534.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084ffa159d5c---52357006962.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/0a47614148a3659c91e0c90f356288c1/44732509078.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=write+me+a+songPDF 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_off00010891.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10891 10396 bytes
SHA-256: 90c712da3ca146854edc64f6315a682f56a38b22ebb6fac8893b33ec224f1c21
font_01_sfnt_off0001201d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1201D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001382f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1382F 17032 bytes
SHA-256: bb6cb7d3fb34f7a6b13aff59794bf10e7e35078b284f3623cc8853386a4183da