Malicious PDF — malware analysis report

Static analysis result for SHA-256 728a0d0aef56096e…

MALICIOUS

PDF

76.8 KB Created: 2021-06-09 13:54:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c72500f3779360f6af1ba3a60409d830 SHA-1: b30eb17a19ea3ae1d50ef68ea365a7012d488fc2 SHA-256: 728a0d0aef56096e585d044a223e5dc7e4dc33e752f78df2ea3f2eca4ea9ca2c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by multiple heuristics and a machine learning classifier, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous embedded URLs pointing to external sites, many of which appear to be hosted on compromised WordPress installations or disposable domains, suggesting a link farm or phishing lure. The presence of external URIs and the overall structure indicate an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://crysiq.ru/uplcv?utm_term=ppsspp+gold+gta+san+andreas
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/16088ea780b5dd---51668885251.pdf
    • http://aliceinformaticasrl.com/user/pages/tazevaka.pdf
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/62b60ef1a848e051e2b3e60d8b2d8276/551178513.pdf
    • http://bradhelferlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/livegukerutopirufizan.pdf
    • http://jp-cable.com/d/files/wufatunowotisizobeter.pdf
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/kngq72mae11e447hied12g2645/kulazeroviniru.pdf
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/sai2muifqa4en4u71hnnhb4e10/65647229967.pdf
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a7670b4855f---20089461122.pdf
    • http://nowyhotelik.pl/userfiles/file/35400490367.pdf
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/lbfmpsmq5rmirevqaenqkhovfm/tonodu.pdf
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/23bc074034235a8d85219bf1f32ca9cf/wuxowigupimigedavegediw.pdf
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/f823c396e306d5d9697fc46e34375f56/94205539993.pdf
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1607e20d97733b---51382908024.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/3a32d8e4046c4ca5eea97afbb24e0a34/44124936455.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/dj5ar723rs9of2lc6cmcb164s7/22615370064.pdf
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/fdikjmqemb66l67jd0qa4uf7vo/fizefetatijowilotagisital.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed52.bin
39f3ae5b3f4a3767c2fa850f21f2d9590496e57ba940577e511b9571bbdd5039		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED52 5128 bytes
font_01_sfnt_off0000fecf.bin
3f4fdf6f75c8817b9506ad4e72feff170fcd9251ad524dce1bb1b86774991233		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFECF 11968 bytes

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