Malicious PDF — malware analysis report

Static analysis result for SHA-256 b72bf75533f41125…

MALICIOUS

PDF

73.8 KB Created: 2021-09-08 04:33:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c5f59722251072424d01399422f60f21 SHA-1: 9370c50dbdbc6f8291fb1175a86e8c9efe8f9fab SHA-256: b72bf75533f41125bf1d69fb46a352fc7effd1a6204053b664102b0e232433bf
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. It contains numerous links to external websites, many of which appear to be compromised CMS uploads, suggesting a phishing or malware distribution scheme. The presence of multiple external URIs and link farms points towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://garglob.ru/uplcv?utm_term=vishwakarma+chalisa+in+marathi+pdf PDF link annotation
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607f37821ba0b---dejijefofim.pdfIn PDF document text
    • http://pitneyclan.com/clients/c/c7/c7afcfad87c307b096642b2e35f52d25/File/80693657162.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/mekazalefazusovak.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bc90e866e45---38228398096.pdfIn PDF document text
    • http://flapboxes.custompackageboxes.com/userfiles/files/46649380625.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/a5e64b3b6217acb158d156193f4e4ad2/80171661783.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160731e85bfd2a---6334588651.pdfIn PDF document text
    • http://buydecor.ru/uploads/files/simuwekikotugimuwob.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0dfb0acc19---76026066774.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161218739b1bb5---sanaso.pdfIn PDF document text
    • http://sushiloverca.com/uploads/files/kesur.pdfIn PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/88972251490.pdfIn PDF document text
    • https://smsenerji.com/resimler/files/52028848570.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/rewetadojidajudopapiget.pdfIn PDF document text
    • https://institut-arabe.org/ckfinder/userfiles/files/44594124415.pdfIn PDF document text
    • https://xn--80aaijz0c.xn--p1ai/ckfinder/userfiles/files/72691356605.pdfIn PDF document text
    • http://ciaooo.ru/uploades/userfiles/file/limipijope.pdfIn PDF document text
    • http://olympicburger1988.com/uploads/files/35825936352.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/5823e76c46b1a122187b574756f1238f/xaziwifow.pdfIn PDF document text
    • http://ciarajewellery.com/editor_upload/file/govotivepadaverixe.pdfIn PDF document text
    • http://didopack.com/files/70324062825.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca8bf50a18---kubisoxatugijusu.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/40808783763.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/49616774507.pdfIn PDF document text
    • http://svsteinfurth.de/radsportfiles/file/9689290102.pdfIn 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://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_off0000b9d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9D4 18536 bytes
SHA-256: 987078102debcb40d07ba3ac39a33639a3731c6ad6f89c8c9faa671405c37534
font_01_sfnt_off0000e8a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000100b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B7 10780 bytes
SHA-256: 5da2cf8f16c772bccde68f923a904cfd5c6ed6b10bb896a3bd50cd6e6f31fb35

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