Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9ece405eb8f1437…

MALICIOUS

PDF

70.1 KB Created: 2021-10-12 07:51:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ff76fbfc2911e226c54dedfed5db69ae SHA-1: 67c5c7e30922500b5f76e6ac13f7f0fcfe23adef SHA-256: c9ece405eb8f14370d4e2eb5a05f90b05b57186083c340ccf56c453b5103f7df
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple domains, many of which are hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The embedded URLs suggest an attempt to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://avukatwebsitesi.kocgrafik.net/upload/files/rogemud.pdf In PDF document text
    • http://osteriailgalloelinnamorata.com/userfiles/files/wawabuverimokesotajijifif.pdfIn PDF document text
    • http://reanda.com/jingkelun/userfiles/files/20210905130201.pdfIn PDF document text
    • https://chilepools.com/contents/files/bizusujiwefeme.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f48d47daad---17029044052.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/5iocttpe8lbbgo7hqrt4pvjrnk/53450220265.pdfIn PDF document text
    • https://www.cascatai.com.br/ckfinder/userfiles/files/25237537166.pdfIn PDF document text
    • http://food-cloud.com/home/food-cloud/www/site/site/data/files/34527291839.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/b6c0822e9745d1973941af5b00fb74f9/20480852058.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/11f8980e70c1aafcd4bd7f638854eb42/virefebazifefarakazelut.pdfIn PDF document text
    • http://flathead.herosuite.com/userfiles/file/41504431419.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/f0866dbaec94de40e79e46e329449e32/3335485567.pdfIn PDF document text
    • https://healthmatters.me/userfiles/file/17428307629.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145f6fad737a---85756414688.pdfIn PDF document text
    • http://dxqzx.com/ckfinder/userfiles/files/20210913_000504.pdfIn PDF document text
    • http://hebammenglueck.de/ckfinder/userfiles/files/32178477566.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16164b971e8aea---80478872161.pdfIn PDF document text
    • http://dokumsuzgec.com/userfiles/files/jimagogikajetogep.pdfIn PDF document text
    • https://bursakaynak.com/userfiles/file/vulalite.pdfIn PDF document text
    • https://atlantidegattico.it/file/64550945730.pdfIn PDF document text
    • http://ohana1bbq.com/uploads/files/77947379220.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/77054041713.pdfIn PDF document text
    • https://www.liftechforklifts.com.au/application/third_party/ckfinder/userfiles/files/77348133778.pdfIn PDF document text
    • https://jewfri.kr/files/image/files/98025696948.pdfIn PDF document text
    • http://vagyonvedelemszolnok.hu/admin/fck_upload/file/mesavapizegozorej.pdfIn PDF document text
    • https://g4m3s-4p1-12s1.com/contents/files/wozapuforute.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/UsNeCLCzgYg/uplcv?utm_term=double+bubble+thinking+map+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_off0000b456.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB456 11008 bytes
SHA-256: 636d8c7bfce7701042d00fd13b8f9f3c45472c80ad05e1dc6761dbe2557ed5e0
font_01_sfnt_off0000cd43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e555.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE555 14840 bytes
SHA-256: 08d62614e83e5b5e7ea5e685b20022a0f4381ee89ec00ba7c5bae6e82ad02c97