Malicious PDF — malware analysis report

Static analysis result for SHA-256 04a8fa4de772558f…

MALICIOUS

PDF

110.1 KB Created: 2021-09-08 16:37:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 77a0882b32c6f944ba8ff0e3957469c4 SHA-1: 5660c7844cc1f0ff5e1269c3065503988a8abd79 SHA-256: 04a8fa4de772558f3e5b6f7c3eb6f42396750aaea1c44196303a2423c6f38cbd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. It also features a link farm pointing to multiple external URLs, many hosted on compromised or disposable domains, suggesting an attempt to obscure the final malicious destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://arabstina.com/ckfinder/userfiles/files/jalolowagojojuguwojejof.pdf In PDF document text
    • https://lecachet.fr/docs/files/907983335.pdfIn PDF document text
    • http://ildungrice.com/fileupload/fckeditor/file/limagemepefaviv.pdfIn PDF document text
    • http://praguynakorn.com/praguynakorn/picture/datapro/files/41851264677.pdfIn PDF document text
    • https://digireg.nz/upload/niwosigowejofufalalop.pdfIn PDF document text
    • http://coniperfumes.cl/js/ckfinder/userfiles/files/wetugomujizow.pdfIn PDF document text
    • https://www.sibirprokat.ru/ckfinder/userfiles/files/31730222576.pdfIn PDF document text
    • http://crabandclaw.com/uploads/files/560911594.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/rsk25pt69hlpl00umo4q4ijuh6/nobul.pdfIn PDF document text
    • https://stdtekstil.com/upload/ckfinder/files/wizifajolek.pdfIn PDF document text
    • http://aaz.sk/editor_uploads/files/kikakijemigusut.pdfIn PDF document text
    • http://aedjtjdshbf.pretty-match.com/upload/files/61159834975.pdfIn PDF document text
    • http://chekeeh.ir/basefile/chekeehir/files/vufixed.pdfIn PDF document text
    • http://abwjefferson.com/uploads/files/65513995576.pdfIn PDF document text
    • https://kaptenhoki.com/contents/files/7973268712.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16137570bf0e29---45546032663.pdfIn PDF document text
    • https://ddc-touggourt.dz/ar/files/mivejususozinopematak.pdfIn PDF document text
    • http://hoya-system.com/uploads/files/202109041402563473.pdfIn PDF document text
    • https://tomorrowhubs.com/upload/users/files/85689173805.pdfIn PDF document text
    • http://www.afurg.com.br/assets/ckfinder/userfiles/files/rudovenuzapomate.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132e24beab49---41340580082.pdfIn PDF document text
    • http://muasamhangmy.com/ckfinder/userfiles/files/12468139778.pdfIn PDF document text
    • https://pragatitic.org/ckfinder/userfiles/files/7905780398.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=nevera+haceb+himalaya+375+manualPDF 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_off000146b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146B9 10860 bytes
SHA-256: 1eb56b8f5e671fff64fcd6e5cefc937cb7eaa435d9dab05c249c1d773c7b9749
font_01_sfnt_off00015fab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FAB 19740 bytes
SHA-256: 4817bd4a3b76bfc3d81ee765ec6a24ec168f81e7f3e696653bf4bc6b9389d0ea
font_02_sfnt_off000192c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x192C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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