Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c2abc2fe5bd121c…

MALICIOUS

PDF

111.9 KB Created: 2021-09-06 14:45:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7c64dc2fbec0fb295a0b6e2c6cda347c SHA-1: 056f7ae49a164951417f5cc7aed3e243aeab5136 SHA-256: 1c2abc2fe5bd121c5c0bd7c73105d7b9df4b113ecf01c220f86345cddd22b3f9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a link farm directing users to multiple external URLs, some of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, limiting the analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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 http://kqcme.yiaiwang.com.cn/upload/files/66538293265.pdf In PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ff9c788ba3---volajujamabuvejizet.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/77542726222.pdfIn PDF document text
    • https://maximatrimony.com/ckfinder/userfiles/files/gasokuraxonogenazibibir.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bc5a421b205---rujenazuliba.pdfIn PDF document text
    • https://isleo.com/i_photos/file/79056571702.pdfIn PDF document text
    • http://www.nomorcantikjoss.com/file/guzawenifadore.pdfIn PDF document text
    • http://baheth24aqari.com/ckfinder/userfiles/files/jifikopezavolememig.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/fibj0176aoaogdc8m1hn0h1j6e/nepuxavegob.pdfIn PDF document text
    • http://hotstamping.pl/files/file/53356641140.pdfIn PDF document text
    • https://mebelihome.ru/upload_picture/sifomidonekedebora.pdfIn PDF document text
    • https://sesconbs.org.br/ckfinder/userfiles/files/24934807488.pdfIn PDF document text
    • https://echipamente-scule.ro/userfiles/file/6990846115.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/75447359668.pdfIn PDF document text
    • https://cafe-malaysia.com/contents/file/rorumitulunujan.pdfIn PDF document text
    • https://minlinart.com/archive/upload/files/novuxi.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/d4cvluberq2snru9amkrnhtkv8/bozezup.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607686b7d67f8---sowepil.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1611b61bbf0a8c---5641478064.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee220bad6ea---53880915482.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607939a2d862f---foluzozularurar.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/65452854366.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/5c89b7106fbbf6bde3cd58879cac5e05/90461885946.pdfIn PDF document text
    • http://oprandi.it/userfiles/files/mositamisoli.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=libro+speak+out+elementary+workbook+pdfPDF 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_off000145f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145F1 21220 bytes
SHA-256: d39b8407686ec71fba8a54ad66fd4a3d4cdf74c20a67cbd86ff37e196ff4a257
font_01_sfnt_off00017e20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17E20 11148 bytes
SHA-256: 524aaaf7e2ad2ed840968c2a2824b2bd7c9e52ec0dc9ae57d36434e0363dc7cf
font_02_sfnt_off00019806.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19806 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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