Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9c1999f343eaf49…

MALICIOUS

PDF

74.8 KB Created: 2021-06-30 12:24:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: db373e5f06de58a91c41ec2cf971437c SHA-1: 1768bd7bc81a7571a7ce2b39cf49d5cfbbcf49bf SHA-256: f9c1999f343eaf49216dfd45999d8b3f5652b0d1b59f2738632cb516bb5d6819
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm or redirection scheme. The ML classifier also flagged the PDF as malicious. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics indicate an attempt to direct users to potentially malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8130

Heuristics 4

  • 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://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074acc661d01---befimotedisovenog.pdf In PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/81bbfdddc9aae235d31a5c777736210a/78562611903.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/stf17uiqacakhhqo26evk4qo4l/bodezademapeziwoguji.pdfIn PDF document text
    • http://piecco.eu/upload/files/96761187850.pdfIn PDF document text
    • https://bigpointpin.com/calisma2/files/uploads/puvelojofu.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/f78e49df8d5dd37a4ab8c59d1a0a4797/gozasilefesud.pdfIn PDF document text
    • http://rbtyutj01.com/userfiles/files/lobiwegotidobonivosarigub.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/68582pii2ubijrm0ouaf733bc3/tifowoko.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8e6cbe7fd---zomazeduga.pdfIn PDF document text
    • http://goraku-sangyo.com/userfiles/file/belitevalapexop.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8f7094b81---47841362255.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/s7t0det921shg7k85ikh0kmf42/xakabeguzus.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/579dc628290d2db778de07d20156ad3c/82066760237.pdfIn PDF document text
    • http://xn--80aamdqpfpr.xn--p1ai/upload_picture/1679368012.pdfIn PDF document text
    • http://jp-cable.com/d/files/wajewaleta.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608be1614121c---40051473869.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/3c9bf419a911ac6310cceb9a98a69017/bosonexubiwinamobegoxi.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf8a36f5eb---dutilipitisitifojoxaf.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/2a9abd9195820a58f697b902fa03cd18/latubagumojakugukig.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/f7a7a976f3892aa57b5eaa9cc7affc4a/tawon.pdfIn PDF document text
    • http://hud101.vn/webroot/img/posts/files/803465680.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/ba760ff49abf3e4e4ffd9f623e5b83f7/55598378482.pdfIn PDF document text
    • http://healthywithhart.com/res/file/zabaguzowifefozerarile.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=american+medical+association+family+medical+guide+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_off0000e9dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9DD 17116 bytes
SHA-256: 6c4fa4a35f40fa8e0253721ab6c0ba4a9c536709c8ca8d27a1a63ab55f6c7da4
font_01_sfnt_off00011624.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11624 11160 bytes
SHA-256: 3c3c511e1d7bdf3d39d5a0d2653f7f94c3fdbe27cb911acc6a7eaf64bfdaf25f