Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb3f5895caa1213c…

MALICIOUS

PDF

88.8 KB Created: 2021-05-15 22:29:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 7d74d1aec39adcff208f85b195a956f8 SHA-1: bdfb48a3c217e406965837614331b68c4ec3d366 SHA-256: cb3f5895caa1213c7c3d93ad217112d45c5c43e451e2670f6950067fe6ff46de
156 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It contains numerous links to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution campaign. The embedded URLs, such as 'https://cructi.ru/uplcv?utm_term=agnus+dei+piano+chords+pdf', are likely used to redirect users to malicious sites. The PDF structure and link farm indicate an attempt to obscure the true destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://cructi.ru/uplcv?utm_term=agnus+dei+piano+chords+pdf PDF link annotation
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082c516260d7---52258845914.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/a3f6d617dac52e9eedac099f47781ae3/lapuvifasotosafejom.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080cd7e47667---bivegafuretinuzepuwuf.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c16cfedb65---xovemufazugosive.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160719d7a8905e---78482008240.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/16076cbb479e94---89038289020.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16096bbfc49662---bopeliwikigepetefasizule.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/jdrrmb40g9hifq4bqis4t183gb/posotezaroxonufekik.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160799daf05d79---19884300183.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092016c2b6f0---getofewenekugatetewigexop.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/fexewiluwusujisis.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/2ea1f1ad72071b43dcd03622ed300dcf/81504938008.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609452c5f268b---97207196450.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/bubetenebakemusa.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/7cafc2df9277a44ead4436a622067fbd/44934155460.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f454.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF454 7684 bytes
SHA-256: 36e529d7018292055e39eec04dd84129bc351779dc1166bee4ce3bb380b32532
font_01_sfnt_off00010e6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E6F 5372 bytes
SHA-256: 301db8bf15cfa176ea7e4db2431fa4428304e56fd41228746c9d13c688b2391c
font_02_sfnt_off000120ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120AB 5812 bytes
SHA-256: cd0f4459de52dfd6ad42251c6369362a9af6018fafeec65dcaeb8cee15515f08
font_03_sfnt_off00012f42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F42 11532 bytes
SHA-256: 58e85f252260612dfc9f3ea28eb4bde7d15d5796c36308eeca4a0074fffa63dd

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