Malicious PDF — malware analysis report

Static analysis result for SHA-256 92404b90a96687ae…

MALICIOUS

PDF

89.1 KB Created: 2021-06-29 13:46:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e16df57690faa9fc25428a5f02108aa9 SHA-1: d49a7abe15111dc83494e87d891077f81890bb0e SHA-256: 92404b90a96687aed852ff51ba03381abfde3ccbc5cd79c265073b9a28f311f5
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised or disposable domains, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV also flagged this PDF as malicious, specifically as a phishing or trojan variant. The embedded links suggest an attempt to lure users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://northstarbaptisttyler.com/clients/a/a4/a4b4c2e389351fb2dee96c3f727c6a57/File/lifubexurojosewelimiji.pdf In PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/9f2f36a818165be41fd1b6ebcf10232e/76144640155.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/ccf7c186c16291a2eb5b2fdaeeffe3ff/94778467416.pdfIn PDF document text
    • https://hamasataccessories.com/userfiles/files/satuxifi.pdfIn PDF document text
    • https://xehowo24h.com/images/ckeditor/files/tefitiludafobin.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/ctu0m68vum5v0npjime297s3k6/tiridesekarijojokipite.pdfIn PDF document text
    • http://graham1978.com/clients/79565/File/11265951530.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16087ef2d5c4d0---nipatidakobivomiveti.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/7c9e2bad76274ea9731e393b66482d90/zelovadage.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/93f1675c567f4e92e9a1c7b83076514c/97347896829.pdfIn PDF document text
    • http://xtra360.net/campannas/file/94422587774.pdfIn PDF document text
    • http://cimkezes.hu/uploads/ckfinder/userfiles/files/razuramitatunuvibub.pdfIn PDF document text
    • http://csc0535.com/userfiles/file/20210612135421_bykhio.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/cp17qraf4s5cb66tsgglnkog9n/48629439429.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091c800e72ad---tijemibopalabegogisasa.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/fed0e2f6324b05c3dd8b692a204a9faa/birimododefizaremaz.pdfIn PDF document text
    • https://lotte-ppta.com/beta/assets/file/40018931814.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/vetekijedetivominad.pdfIn PDF document text
    • http://chizclean.ru/files/fck/file/36832149394.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a727f8a55f---vevimegosilifaxe.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099c89b0e80c---37123317009.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb8d759c02---93557664857.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/056bbbff0a7f73085f3c5650231f6eff/wuzikimusimuxupima.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=total+money+makeover+free+downloadPDF 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_off0000f84d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF84D 10576 bytes
SHA-256: ed5a224adf4a68635396eb526581461528cf42afe2b268ca8da9f3eab375d703
font_01_sfnt_off00011088.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11088 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001289a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1289A 18264 bytes
SHA-256: 25df156cc3f70ef719a76a94841e55daf33b6b26d0a9bcaa0777d1234b1baab3

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