Malicious PDF — malware analysis report

Static analysis result for SHA-256 05122dd7403d1127…

MALICIOUS

PDF

79.9 KB Created: 2021-09-05 22:58:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 593cca65ae4087cc742803beb206724a SHA-1: 7406aed20756f1cc1eed9d3fb06f205cc328575f SHA-256: 05122dd7403d1127cc8dff5dcd6b606e7392bd38be14ff856b6789ed8f49cba8
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, suggesting the document's primary purpose is to host links to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://kccmaul.com/files/files/46937153861.pdf In PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/4fc030618586882d1bc9ed69fb273190/wuvefewakuvafibup.pdfIn PDF document text
    • https://www.benkorner.nl/admin/library/ckfinder/userfiles/files/mivip.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/80507481995.pdfIn PDF document text
    • http://7166867.ru/ckfinder/userfiles/files/vedagajakabokexe.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/e0b5ef8f122a5fa9f1eb687d011ed824/jamolapafilelojuvilujigu.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8315e7f732---zevusigimaxuwejewatu.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160738e4683aaf---virujigatezezu.pdfIn PDF document text
    • http://www.bluefashion.cz/ckfinder/userfiles/files/jofasosaruwuk.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16088f0ef174d2---81116976563.pdfIn PDF document text
    • http://baggiez.net/userfiles/file/56786529373.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607a2397e2704---tupalekobakam.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/7aa22903f29b3ed490040ec09b97188e/55568950231.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c57f0e32cd---vijesedesexijipozefozuki.pdfIn PDF document text
    • http://sitoad.com/bbqjoekey/files/202107231721537276.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160808186a20a6---siboxipeseradepubukalozo.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202106230457399060.pdfIn PDF document text
    • http://bociany.sk/media/file/renizilave.pdfIn PDF document text
    • http://igabana.com/upfolder/e/files/20210730075816.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/dr9lth8slr5msspf5klrql14pg/64541808409.pdfIn PDF document text
    • http://ccshecea.org/upload/files/16091751667.pdfIn PDF document text
    • https://lesfeesdelhetre.fr/upload/files/mesomuvisigumima.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/tca6nb6flse8gsq7qmtcproqvp/43966555098.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/1e8bd45d0dbc33e4a0228a3daa045e5a/dubuvuxewi.pdfIn PDF document text
    • http://paulsaperstein.com/userfiles/files/50129436084.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=improper+fractions+to+mixed+numbers+worksheet+year+5PDF 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_off0000cf58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e76a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE76A 17924 bytes
SHA-256: e8fef16960c4fe500e3b7b96e7aa1d816649db31734b23c135f7d6f62e4a043a
font_02_sfnt_off0001165f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1165F 11560 bytes
SHA-256: e647649a77b623c35a0458b637d23d76508f904381e3d2686e464c63aeb4eb35

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