Malicious PDF — malware analysis report

Static analysis result for SHA-256 8296c5dbbbc745a7…

MALICIOUS

PDF

81.0 KB Created: 2021-09-04 13:35:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 91f68a984a4e9786f7d053f0009beb10 SHA-1: f7fbfa9339433bf6d863bab6e62407cc16fbe881 SHA-256: 8296c5dbbbc745a737eabb0c6dea003d95e8b6577201fd0cbb295a929a41c86c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous URLs, many hosted on compromised WordPress sites, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the presence of embedded URLs and the nature of the link farm suggest it is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/a824d183afbb90478ca3c13ec188e206/20388242549.pdf In PDF document text
    • http://geoodwierty.pl/files/file/3591865272.pdfIn PDF document text
    • http://parejalecaros.com/adjunto/upload/fck/files/90431775806.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/lesetokuweb.pdfIn PDF document text
    • http://3suntech.com/UploadFile/file/20210618065056285.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/97466376026.pdfIn PDF document text
    • https://drjou-vc.com/upload/files/sukufaxiruvibev.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/waregawemuwubuxesajol.pdfIn PDF document text
    • http://resortvillairene.it/userfiles/files/4526446808.pdfIn PDF document text
    • https://shipnhanh247.vn/asset/files/62815168499.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/f4c83de691a842ed8467e535e0179731/lavowebokerapivuzazin.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/tikazut.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c686b779dd---vosofuwunimaboto.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160fafddd41010---45469422625.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160cc32c4b034f---62812421242.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090c952b36a8---govelovelelup.pdfIn PDF document text
    • https://puppometalli.eu/file/62140746550.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130dd8ce45e8---30659853070.pdfIn PDF document text
    • https://chp-travel.ir/data/file/pilaresameligofavezuwawif.pdfIn PDF document text
    • https://proektasis.gr/admin/spaw2/uploads/files/94419850026.pdfIn PDF document text
    • https://mariapolis.net/ckfinder/userfiles/files/82980152964.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/8b67f6e9b20c731ff75b2083080ae3f5/87323079150.pdfIn PDF document text
    • http://dotykbylinky.sk/_subory/subory/22598813193.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a1c4a14c5fa---rugewimosunu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=ll+licence+download+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_off0000d4e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4E2 18568 bytes
SHA-256: 272ac7e771f849a16dc7dc651c67774dec3d9df9dab2b5d24a466f56d702b37c
font_01_sfnt_off00010542.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10542 10292 bytes
SHA-256: 17ebdf5ac367ce6f3f75ced7cb27411674b743524e245a09c0060e129a38fd6a
font_02_sfnt_off00011c8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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