Malicious PDF — malware analysis report

Static analysis result for SHA-256 5432acebbb129c3c…

MALICIOUS

PDF

94.3 KB Created: 2021-06-26 04:50:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 58f48283a4a8a496ab0023282f92e1fd SHA-1: 88565cd6e8d46a693539063290727a8acf57dd5e SHA-256: 5432acebbb129c3cc5341185d254f96cbc608e8fd2d5b979349adf8019269c10
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm to distribute phishing or malware. The presence of these links and the overall structure strongly suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/e28673fb503eca0b1317184f6e77fcb1/80888622715.pdf In PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606d65885f3a9---56564585684.pdfIn PDF document text
    • https://hantverkarenisandby.se/UserFiles/files/govepeliwifoviwanife.pdfIn PDF document text
    • http://ck-tct.ru/userfiles/file/2681265810.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/jirodavona.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160bc85bedaef0---16548255921.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160cc192e07f88---zudawomejotepekejudu.pdfIn PDF document text
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a0c1587082---77532616412.pdfIn PDF document text
    • http://tvkinter.com/file_media/file_image/file/tunosigeduradizekazapu.pdfIn PDF document text
    • http://beateromer.com/bilder/file/79359614174.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/b5f4b1309cf03c0242fafc0ee87c73fe/tugog.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a98ed061e67---pijorenalevat.pdfIn PDF document text
    • https://xlspandoek.nl/userfiles/file/22346396901.pdfIn PDF document text
    • http://gazosilikatnn.ru/uploads/files/66173791262.pdfIn PDF document text
    • http://www.dramayaramendes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607d4a57ae3ad---jewikemogugep.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/4u0llevbfouov32q0dfta6ceg7/dedaguxo.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c75324a21f4---70731985193.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af6c5c5dd0c---wasobinowiguzuro.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/52567725411.pdfIn PDF document text
    • http://edwardlankin.com/clients/86087/File/7881365250.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c997bbd376c---88041344402.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/5494810399.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/5dad4950c7066a3ffd00bc6b4d0a1900/15974952886.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/sodisuta.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607025e2927c5---53426708018.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=the+lovesong+of+alfred+prufrock+analysisPDF 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_off00010a76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A76 11136 bytes
SHA-256: 99cd2cf0e5ec86948ece0c93e5dcd913247776271ef8bfcaf03653791a2c8d6d
font_01_sfnt_off00012441.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12441 17688 bytes
SHA-256: 053f1a25e8928c405c6e9e79b1e3c65473d6158fc19309ac3f2918eb8518deaa
font_02_sfnt_off000151ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1