Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ea3a7ff5c98b90f…

MALICIOUS

PDF

91.4 KB Created: 2021-09-04 13:06:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 24bf81047191b15fdcdafa6029a60c0e SHA-1: b51881c656295094f1a9cd433da1396c73a2a9b8 SHA-256: 5ea3a7ff5c98b90f7fd5c81fc31f7ec4b248f3dc6ed042eb7f108af8a5c008fd
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites hosting PDF files, indicating a link farm or SEO poisoning attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae7bba1973f---79466908778.pdf In PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160757a5aaff34---kafopoki.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/d919bea39ded0cd203895e6dc40f35b7/79023486057.pdfIn PDF document text
    • https://fluffy-chins.com/images/file/pajarurezepuwiz.pdfIn PDF document text
    • http://bilcafe.it/userfiles/file/zejasu.pdfIn PDF document text
    • http://sweatrinserepeat.com/ckfinder/userfiles/files/30596781034.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071d51e5d0c7---divimetomulikomusuwibeva.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/614fcb9bb0230c0e174765b307725082/fedutoravatanagufumof.pdfIn PDF document text
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/26fd3173a1d22f1c109041a497687725/zupalizetivapemid.pdfIn PDF document text
    • http://alumcity.ru/userfiles/file/44431290805.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/jjj18koe6gtakk3upkgbt7b0n4/zepifetaripiziwa.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160c70e289f6c2---fojuluxeru.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f205068e610---kojezizorelutugowa.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/he0bt3mo0j3gdfd6751ps5nt6o/6553934067.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160787f8c5d115---36880460196.pdfIn PDF document text
    • http://falconltd.pl/cache/file/63153670681.pdfIn PDF document text
    • https://sharmtocairo.com/userfiles/files/panotape.pdfIn PDF document text
    • http://studiomanzetti.it/userfiles/files/54688545741.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612389debd263---mopeva.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/bc51095844e33ba295c764da1053d244/8032731243.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/mesadejuduvebofotaxukuguk.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087715eeb6a8---wikofifasepitomewip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=advanced+accounting+guerrero+solution+manual+chapter+8PDF 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_off0000fc39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011450.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11450 11316 bytes
SHA-256: 84335be3dadcbf6f5cc1d061942e04481cbc1665ed86de14468c30c2fb96f60e
font_02_sfnt_off00012e92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E92 18860 bytes
SHA-256: e84a961db79f7eedeb0461333e1f1f72e567024a8f28919c60d1debb2494dc36

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