Malicious PDF — malware analysis report

Static analysis result for SHA-256 46460b8f87e6f3ae…

MALICIOUS

PDF

77.6 KB Created: 2021-07-08 00:57:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: b955c888abca4e8ca4994f0378c7a419 SHA-1: 3d56597a07e7dddbd8a2b40585f17b0a49207f50 SHA-256: 46460b8f87e6f3ae6cdae6cf72bec2faf63b9fcfeb35dc6b68f9052a4fba0c6d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. Several URLs point to compromised CMS upload directories, suggesting a phishing or redirection scheme. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious intent, likely to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7449

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • 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://isystemlab.com/admin/ckfinder/userfiles/files/rukuf.pdf In PDF document text
    • https://fnb-concepts.com/images/uploads/files/zututanuvakut.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/dipafopixofugav.pdfIn PDF document text
    • http://hotelniagararimini.eu/userfiles/files/litibofo.pdfIn PDF document text
    • http://cathayred-csr.com/img-cathay/files/povadulikonavinabes.pdfIn PDF document text
    • http://magooferta.pl/uploads/fck/file/83607315584.pdfIn PDF document text
    • https://catbasailing.com/upload/fck/file/88895666505.pdfIn PDF document text
    • https://publicbridge.pl/userfiles/file/42050513503.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/9818588b21ac0e8049dfd06c80725ad5/52150884756.pdfIn PDF document text
    • http://papianiarch.it/userfiles/files/15842490657.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/8e1779cb3d11a9912b28c3b323a45d40/42443310818.pdfIn PDF document text
    • http://ahkkpcm.org/userfiles/6748278992.pdfIn PDF document text
    • http://isspskola.lv/userfiles/files/9886273801.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b49d5217461---72085459385.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16087d9def2b7b---riduzitazezag.pdfIn PDF document text
    • https://www.bistro-e.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073ecd227cc6---65129253211.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0e31201f4---42484835828.pdfIn PDF document text
    • https://p99.tw/pro_pic/files/leposusikalawoxewopofezo.pdfIn PDF document text
    • http://somsit.com/ckfinder/userfiles/files/60232965271.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086ee5ea7110---xusupunisuwelikotevufow.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c136e402b8f---tofolagelanedamalese.pdfIn PDF document text
    • https://uleshuzataruhaz.hu/files/file/puwenazeka.pdfIn PDF document text
    • http://sportsht.com/userfiles/file/ruvivumufagefi.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/58758992777.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099aca5d6b4a---68027427020.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=woof+woof+puppies+and+boutiquePDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f801.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF801 16696 bytes
SHA-256: cc07123a0799d305e97c6321d1dcee6f6f3a2c9e331da3714db2f121458eb05e

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