Malicious PDF — malware analysis report

Static analysis result for SHA-256 23177ae161a6d256…

MALICIOUS

PDF

96.1 KB Created: 2021-07-26 10:20:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8fc4d74f5d10ccfcaab619e61f495ef9 SHA-1: 8ec35be5fe55a559f5dde9dc30863bb2a683e61d SHA-256: 23177ae161a6d256819208b6ef43e1519b45799ddfca47cec7b997875188b0a8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised WordPress upload directories, indicating a link farm designed to host malicious files. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The document body was unreadable, but the presence of multiple suspicious URLs on compromised domains is a clear indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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 https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad108b46bd---rinavu.pdf In PDF document text
    • http://geometrabottero.it/userfiles/files/19676720941.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160842c6e47c8a---13720568453.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/2562b110abc3f91925c068c572c85112/56148140052.pdfIn PDF document text
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/bemozadozogibezafu.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/tugamevokoruvarawuvorovi.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/fulifamopipeji.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d4f7f1f87e---sejiramebigajir.pdfIn PDF document text
    • https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/9143388e3037a3631f91022e0f58e52d/tisuruzolarolaribotip.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/32812606706.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/85cc24033286eb82cf56c8f48c78363a/18588709036.pdfIn PDF document text
    • https://jetaime-shop.com/files/noririrupidenir.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/zuviberenigonaromalim.pdfIn PDF document text
    • http://thetestmag.com/userfiles/files/95187335614.pdfIn PDF document text
    • http://home-delighted.com/user_img/files/koxozasuputemasale.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/c804893884af404f0386543015325e0c/89779336422.pdfIn PDF document text
    • http://tourister.kr/userfiles/file/jijug.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/494920da21dbcbe16626a2dba5282ab1/zakejiradi.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a1bae5be921---zunir.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/45241443382.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bbea9137a38---93484213571.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/16096ce152fa30---13025479358.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607720f6478a2---rukisujilofatoligotijadi.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/xegobulikedijeto.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=acids+and+alkalis+worksheet+grade+7PDF 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_off000112d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012ae6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AE6 17728 bytes
SHA-256: dbb4e6b243abf7c581929acb03c7a4eccd50d401f945b3691eba484c8084416f
font_02_sfnt_off00015913.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15913 10856 bytes
SHA-256: 6b46f294d378919d34509b059ee758d008fd2a59a8b6579830e0f09a152074a6