Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d5c69775dddf1d8…

MALICIOUS

PDF

63.7 KB Created: 2021-09-25 17:31:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 2bbddd692f042811d71b2f5e9867dad4 SHA-1: 06fe4f5ffd2cd67b29bf6d1666e18c3aac7aff19 SHA-256: 1d5c69775dddf1d81bfef3f1400f57841e6fc81aa7e0c3cb660fdcd7d0e94340
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to disposable hosting or compromised CMS upload directories, indicative of a link farm used for phishing or malware distribution. The ClamAV detection and ML classifier further support its malicious nature. Although no scripts were explicitly extracted, the structure and URL patterns suggest an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5809

Heuristics 5

  • 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
  • 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://caycanhtuyhien.com/uploads/image/files/66158857455.pdf In PDF document text
    • http://secohthailand.com/file_media/file_image/file/rugir.pdfIn PDF document text
    • http://ozt.zielonetarasy-cieplice.pl/uploads/userfiles/files/zisemeleburepuvovoboveze.pdfIn PDF document text
    • http://myshiou.com/uploads/files/202109251436039802.pdfIn PDF document text
    • http://como.gattinonimondodivacanze.it/themes/userfiles/files/18255221434.pdfIn PDF document text
    • http://gpp300.fr/userfiles/file/71491563556.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e3cf0f0843---depefifeloxegodojalex.pdfIn PDF document text
    • https://novsport.com/content/File/kavawapurip.pdfIn PDF document text
    • https://raiporjai.com/piceditor/file/xezujovalonobixujizib.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161359253a9e21---rubopuguzavavifilusuwosaz.pdfIn PDF document text
    • http://www.malagatour.es/ckfinder/userfiles/files/dixotuwizukomubu.pdfIn PDF document text
    • https://castilloexterior.net/ckfinder/userfiles/files/fajezusaj.pdfIn PDF document text
    • https://turismo-galicia.es/ckfinder/userfiles/files/53588339556.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210909131337.pdfIn PDF document text
    • https://km2804.com/ckupload/files/sisuxanedikaxikutofozej.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/jinipakovapiwejen.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/xozom.pdfIn PDF document text
    • https://planningpvedh.nl/ckfinder/userfiles/files/fanul.pdfIn PDF document text
    • http://sluchatka-shop.cz/files/upload/files/luxuwebezolaxanijukez.pdfIn PDF document text
    • http://scandinavia-ex.com/images/blog/file/jinoxi.pdfIn PDF document text
    • http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/bijokinumeku.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/03807bb5aa7e1a83b3d25e5d81c8dcaa/65857214586.pdfIn PDF document text
    • http://24cvety.ru/upload/files/55228585976.pdfIn PDF document text
    • https://cbdc.co/uploads/ckfinder/userfiles/files/jubizawewerilut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=pec+body+partPDF 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_off0000b2d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2D1 16384 bytes
SHA-256: a2a164dd0d0046a3cd9d6b49b6c3aa0adfb122a5dcf499dc184faf80ccfa4a17
font_01_sfnt_off0000dc58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC58 10352 bytes
SHA-256: a56038eb483c757339d04cd27e6403911b006ebdab22423497fe4deb7f8cc314

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