Malicious PDF — malware analysis report

Static analysis result for SHA-256 44a2434af5028981…

MALICIOUS

PDF

67.9 KB Created: 2021-08-10 21:51:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b0db598ee908933a7b0ef06d3936ed33 SHA-1: 66b0835a1e5d9356143530f62fe9eb210611e65d SHA-256: 44a2434af50289816bd902be07fe4eb5dfc4b762ab7c9e481506e5a70e53fb02
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating it is likely a phishing or malware distribution lure. It functions as a link farm, with numerous embedded URLs pointing to various websites, some of which are hosted on compromised CMS uploads or disposable domains. The primary purpose appears to be directing users to potentially malicious content hosted on these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6431

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://tubietelbar.hu/uploadfile/wopuwukikiwuralonaz.pdf In PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160929de7a93f5---19524458950.pdfIn PDF document text
    • http://sentezetutmerkezi.com/upload/ckfinder/files/wowutikubovivununi.pdfIn PDF document text
    • http://grabnerestriche.at/digilogunu.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16079fb0338e91---fegolapawerox.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/2859978639.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/dalorizofoxigezapela.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/mum1q50ujqrabghnp41frftg3q/xuwozigelowipotitenanorow.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160becd2a40ada---88245178663.pdfIn PDF document text
    • https://fullprotec.com/ckfinder/userfiles/files/1434406423.pdfIn PDF document text
    • http://www.ddu-hk.cz/ckfinder/userfiles/files/72417189930.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/92480029437.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097e76703918---segegiduweni.pdfIn PDF document text
    • http://kimhoatra.vn/upload/fckimagesfile/98021583327.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160da8c0a52c4f---zerag.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/57fd949dceee3226cc1b34412984bb51/tosife.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/16076b1b57a76d---kujewesi.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607580598580d---49401655391.pdfIn PDF document text
    • http://umhouses.com/uploads/files/mazuso.pdfIn PDF document text
    • http://robertfeinberglaw.com/images/edit_images/file/magawukidibomekateniz.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a3283b6d546---72618264239.pdfIn PDF document text
    • http://movesearchesuk.com/userfiles/file/zutimanuwuxinaze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=amazfit+bip+manuale+italiano+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA0C 10672 bytes
SHA-256: 6f18321afee708ce00d357771f8e5ce873b81ce91c603c88b13e540c1e9e1c96
font_01_sfnt_off0000e249.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE249 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1