Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8900a533cd46832…

MALICIOUS

PDF

84.3 KB Created: 2021-07-16 10:58:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 28eeaeb4775df993046614e921ff42ec SHA-1: 50bd3d2fde0a31a498c740fa1808686c5805c3be SHA-256: e8900a533cd46832d1ae5c6984708cc60370ee0daa674ee730a14c80ae2dfe89
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 WordPress upload directories and other disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://artecgroupservices.com/imagenes/file/bonevojafono.pdf In PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/77249vgt6vp62fvpr1veuut6l5/69014903502.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/52295910f3aabea047dc82cc2aef2c45/konoviki.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/9d9eb67ff83f6bf50a04a975c00a63f1/51513360790.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/c819ha7ag90fnsa8kib3v6tmgd/12701070428.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/99108106449.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/eb38c0920e28608906bf030b4aaa4109/9000100373.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/84741434513.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ad41b253d5e---37261639044.pdfIn PDF document text
    • http://legalinet.eu/userfiles/files/13129259424.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/d803e38f08dec0a5d0c49dd7b03ec15c/87247496832.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160943bea18542---33867944240.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160768d97949ef---kusamiwoxegijedogiz.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/qnoekml7r0v97ndaelkuem4570/63475355459.pdfIn PDF document text
    • http://3dprofi.net/images/uploads/file/40972426275.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/43584269358.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/376e2007918f2e3f0e4f129b0f8432dd/gojixaretos.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/j4r5m8sfj9ssec0tl7hmdcq6f4/folapuvu.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/18112aba33a235bd52ef3deff68fbc9c/19599582347.pdfIn PDF document text
    • http://trungnguyenjsc.vn/uploads/image/files/16677602893.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/mm9rqhdm59lcullkvq2573e7dg/40058124164.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/6145833c43d27fc1e5c3ecb76bf2306f/52643162956.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1607eec0b8926f---41324546700.pdfIn PDF document text
    • https://bloomland.com/sites/bloomland.com/files/13510100067.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/wavazixemiwutig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+convert+image+to+pdf+in+androidPDF 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_off0000e42d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE42D 10892 bytes
SHA-256: 336e6c533f204b826752185f07579f8360579128a3c315d289df578d4edd84bd
font_01_sfnt_off0000fd25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD25 17644 bytes
SHA-256: 458870833dab5af985ecdbb960c7021b21d9aa3e0f5970bb7acf77384e558df5
font_02_sfnt_off00012bcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BCB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1