Malicious PDF — malware analysis report

Static analysis result for SHA-256 01a14c3d9cb6d71f…

MALICIOUS

PDF

103.2 KB Created: 2021-07-03 15:55:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 54b453dd482bffd2db96256ca7f363da SHA-1: 3c8733bb7c4391b20ec4de495e6252acd29f1931 SHA-256: 01a14c3d9cb6d71f0ff2f64dc2bd27d3fa6081997e283d363afe34537dec2e19
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress sites, suggesting a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates these links are on disposable hosting and likely serve as a lure. No scripts were extracted, but the structure points towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9790

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://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/d2f50e50f1942e047d6f660956ac3072/69732550119.pdf In PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/lbr67bj2lr97sgjpn2b2lnab55/ximexuweretob.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b6506ce59d1---mikesurejavagijosaji.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b41d6ecb0ee---kapakalafidemarak.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160929f95e88cb---xivebasolezedon.pdfIn PDF document text
    • http://voxel-avocats.fr/uploads/file/42337789076.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0021a77ec---66462724955.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160847b77cd32e---72719110527.pdfIn PDF document text
    • http://pngroup.pl/ckfinder/userfiles/files/32200313182.pdfIn PDF document text
    • http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/67566379066.pdfIn PDF document text
    • http://hoggard1975.com/clients/a/a4/a43fc1111b7ad4318f8b553feb79a890/File/dewotogomibizozolo.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073e9d9c45c5---71918149140.pdfIn PDF document text
    • http://accomplishtheimpossible.com/userfiles_ati/file/lekinerowavisulaze.pdfIn PDF document text
    • https://pima-alarms.net/slicice/file/modalegugeta.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc2fc5c3c5e---87798505798.pdfIn PDF document text
    • http://godswaynehemiahmbc.com/clients/878002/File/gowokoromaru.pdfIn PDF document text
    • http://www.la-rocca.pl/app/webroot/files/files/naletoriviwilesozededama.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/46aa83b2c122b76530ff9927ba2fecb9/tedegodivebamuxu.pdfIn PDF document text
    • https://batikatravels.com/userfiles/file/89340211625.pdfIn PDF document text
    • http://dui-antidote.net/images/userfiles/file/15675882334.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160822bd78f506---96616528392.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/7066099128.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/47c473d480152f805e3ed4944887086b/6927367650.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/8811bea8e1493bd596062103b437d3a6/tumupotufapifiruwa.pdfIn PDF document text
    • http://thuduchouse.vn/pics/file/xivapakevogivekilibokul.pdfIn PDF document text
    • http://cartopack.com/Images/file/xafusavadu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=5th+metacarpal+dislocationPDF 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_off00013011.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13011 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014828.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14828 10816 bytes
SHA-256: 626632224836484d5167fbb1d6c8426e65194c2b4f2991d7db8ff4c09d0b851d
font_02_sfnt_off000160d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160D9 18040 bytes
SHA-256: f3e472f6f9279c9b8b0401bbda29c223c51c003a0e8328ee781ff30bff4072a8

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