Malicious PDF — malware analysis report

Static analysis result for SHA-256 57a31b8b4b706ea0…

MALICIOUS

PDF

78.3 KB Created: 2021-09-08 11:25:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: fb6b80dd177347c27bcb6c8337367c7d SHA-1: 8e0703558a96ff2cd035394b6b50aee4caa7b374 SHA-256: 57a31b8b4b706ea035c8e5bc79a89281bc720e156134ad3325dc6c7b7546ba6e
156 Risk Score

Malware Insights

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

The PDF contains numerous URLs that point to other PDF files hosted on various domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a multi-stage attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://drafthe.ru/uplcv?utm_term=consonant+worksheets+for+grade+2 PDF link annotation
    • http://montaze.org/democms/userfiles/file/67387720589.pdfIn PDF document text
    • https://abicecream.ru/ckfinder/userfiles/files/zafubex.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16084a3cd8c7f8---biruxefarirowerudupa.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/a0c60dc374572174d8603f384ae0b3de/pejobam.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/59158176703.pdfIn PDF document text
    • http://wonderful-foods.net/userfiles/file/zepakozivimapofurafitije.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca4c56ad48---zawarekejurewep.pdfIn PDF document text
    • https://abe-rdc.com/userfiles/file/87172100900.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/82806561627.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160badc23a6b32---revoranomiwodesisirade.pdfIn PDF document text
    • http://nanobubblevietnam.com/uploads/userfiles/file/jiluku.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/dc822701bfb11c9b8021fe30a9d3477c/29265518427.pdfIn PDF document text
    • http://colokit.thienlonggroup.com/Images_upload/files/76978169045.pdfIn PDF document text
    • http://lungshingcentre.com/userfiles/62589943236.pdfIn PDF document text
    • http://redhillplantation.com/clients/1/1a/1a02e1fabf1298af97853074613e4b20/File/59639222843.pdfIn PDF document text
    • http://liily.jp/upload/file/20210821200240.pdfIn PDF document text
    • http://xn----7sbakn3aoflleitf3m6a.xn--p1ai/userfiles/file/15909756507.pdfIn PDF document text
    • http://classtool.info/upload/files/sesapisubajefimevogilosaj.pdfIn PDF document text
    • http://teplolux72.ru/upload/file/vovat.pdfIn PDF document text
    • http://e-sportis.com/images/upload/29387456067.pdfIn PDF document text
    • https://samsungklimamodelleri.com/upload/ckfinder/files/95919377990.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612706346dcd1---55752541355.pdfIn PDF document text
    • http://espressobuilders.com/app/webroot/files/userfiles/files/70828073643.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_off0000ce8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE8F 10824 bytes
SHA-256: 87cb00f140c53f161cc294f2d49c768e46e9d189f906ae6d0bb5cf3983475c0d
font_01_sfnt_off0000e779.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE779 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF8B 17176 bytes
SHA-256: 82adf479ccf4390a5e9a988b123412587f32515cbee0c9a45ab2ec16628b204b

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