Malicious PDF — malware analysis report

Static analysis result for SHA-256 d82f2f13b5aefb14…

MALICIOUS

PDF

85.4 KB Created: 2021-08-23 16:35:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: a588f2e7543094f52d66abe1138af793 SHA-1: 11598da4c6de15d4faf31d668f2b513260b71604 SHA-256: d82f2f13b5aefb14ad5321f8cf0c01d43726f72053ab77eccf39bebeb443ec0d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs and is flagged as a link farm, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://cructi.ru/uplcv?utm_term=describe+what+mendeleev+found+when+he+organized+the+elements+by+atomic+mass PDF link annotation
    • http://www.findvoters.com/userfiles/file/tazinedokilowo.pdfIn PDF document text
    • http://gleneaglehoa.org/images/file/47796717425.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/oqrnulqbes313spjg6cu0nrr5t/63248041409.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075231e0594d---72145211527.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/a43874d8a9de887109b3fdb4882d53e0/mosatawi.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/06/17/file/20210617_210022_112.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160869b3226f4b---mukorowexivixonobomew.pdfIn PDF document text
    • http://eurogeographyjournal.eu/admin/fckfiles/file/dadezo.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ed2361391---tegigogabo.pdfIn PDF document text
    • http://zhhyhb.com/uploadfiles/files/sisejakuwilaki.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16118952da2f81---gapamazakararugelexatuk.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/3mb9f5ganb83qvsm0p7m7egseh/xilelujusetozovitonaxar.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/63147184476.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b1d25d56be1d4f7b1e3594d0a9a716f5/93263920619.pdfIn PDF document text
    • http://nutrisoilvietnam.com/upload/files/lonobuwaji.pdfIn PDF document text
    • https://pristineleather.com/userfiles/file/pifawologasazeju.pdfIn PDF document text
    • http://indovinandoilmondo.it/themes/userfiles//files/62234808072.pdfIn PDF document text
    • https://tsafar.ir/basefile/tsafarir/files/17897550340.pdfIn PDF document text
    • https://arrayamed.com/userfiles/file/vaweweboriragali.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/1ce51d38f4acb7c57562754b20dafe24/negiganejusuwusax.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/files/lawidujikiz.pdfIn PDF document text
    • https://cheesykeju.com/contents//files/gifejuvoduxixot.pdfIn PDF document text
    • http://vswet.ru/f/xizejagepijunoreted.pdfIn PDF document text
    • https://tonitomov.com/picture/file/39312830602.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16085f0f39f3ec---22704481861.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/894761a740234a2cd767bb64deef777d/gafopebonojinesibagutifo.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_off0000e8c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C2 11492 bytes
SHA-256: adb0c09ef798945b2ac24a9a86355b34563164b87b257453f02894fb65ecc762
font_01_sfnt_off000103b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011bc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC4 16508 bytes
SHA-256: 1dc32eee8fe94295e03845caaa58c84d7dca41be653bc9e731222e6f099af4ab

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