Malicious PDF — malware analysis report

Static analysis result for SHA-256 6862f8439c3c3e5b…

MALICIOUS

PDF

82.3 KB Created: 2021-09-07 08:27:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f08f3a45c0b61269797947280fd4393c SHA-1: 5a079816a5f3121edaa5730b16507c6b3f20fafd SHA-256: 6862f8439c3c3e5b6752b1c8f1a6d1bf328128745b615d06ea482a2a0d0045f6
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm used for phishing or malware distribution. The PDF structure itself does not contain readable content, but the heuristics strongly suggest it's a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://markyatirim.com/resimler/files/julukojobegugod.pdf In PDF document text
    • http://sangiorgioautoservizi.com/userfiles/files/5180811096.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161135b9619ad3---mixeriradozubez.pdfIn PDF document text
    • http://emilygrilltogo.com/uploads/files/60958015918.pdfIn PDF document text
    • http://ayurveda-shiatsu-nice.com/upload/files/xupiwuwikin.pdfIn PDF document text
    • https://gtnet-engine.com/ckfinder/userfiles/files/61259619557.pdfIn PDF document text
    • http://gitimohammadilakhimpur.org/ckfinder/userfiles/files/dedibu.pdfIn PDF document text
    • http://stainless-faucet.com/uploads/htmlupload/files/moxalakebajeropomax.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/63212524823.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/c6p81afo5v7u6l9lcmtkqu9ieh/46714755482.pdfIn PDF document text
    • http://szyqjsj.com/UploadFile/file/20210804140340375.pdfIn PDF document text
    • http://auroraenergyproject.it/userfiles/files/88219987086.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/ls3n332r43pbf6jv72o7pq6ieh/43637830062.pdfIn PDF document text
    • https://sanagustin.cl/files/89248653767.pdfIn PDF document text
    • http://manpukuorder.com/uploads/files/xitenudapex.pdfIn PDF document text
    • https://sedefartphotography.com/resimler/files/resefobelukuparotomijav.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/2002a8ea968c1229a8df152798ab070f/rowubegele.pdfIn PDF document text
    • http://www.vandiestbrandstoffen.be/uploads/files/5152317260.pdfIn PDF document text
    • http://sbnjl.com/userfiles/files/28854287290.pdfIn PDF document text
    • http://e-hane.com/files/gidubi.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae22ca95481---8314632458.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=past+tense+grammar+worksheets+pdfPDF link annotation
    • https://lapdonline.org/file/94858455069.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_off0000d7d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D8 10988 bytes
SHA-256: 3199520fa7c9b3b77c897ef9ff2c4f9da309bca248a675f6229e669109f1bf45
font_01_sfnt_off0000f113.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF113 19280 bytes
SHA-256: 8fb4392ee9ec09c405695349b25ae3505e39c5a18067402490e5abf51bd6dbe0
font_02_sfnt_off000123a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1