Malicious PDF — malware analysis report

Static analysis result for SHA-256 879c2d3368977206…

MALICIOUS

PDF

85.4 KB Created: 2021-09-17 22:42:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 46c8a75cbe9990e7d9471eba198b7ba4 SHA-1: 8df88471f82f256a309222724e7713feb53dfa9b SHA-256: 879c2d3368977206c3a2926187c23ad25f40ab2de582b15348264c7e831840b1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and link farm heuristics supports this conclusion.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://perchegouet.com/ckfinder/userfiles/files/25913949734.pdf
    • http://njbeihang.com/uploadfile/file///2021090310463039.pdf
    • http://loca-granderoue-montaletang.com/ckfinder/userfiles/files/pifutube.pdf
    • http://ulleungroadtour.com/FileData/ckfinder/files/20210907_0C5D1F98413F774C.pdf
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613f3ac72ed8e---fuwejawumabamuzelogeg.pdf
    • http://3dprofi.net/images/uploads/file/25144410517.pdf
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/6125782484379c5760b37694564d2bf3/26897538397.pdf
    • https://rewaqousha.net/userfiles/files/videbiligemib.pdf
    • http://www.fd.ntou.edu.tw/ckfinder/userfiles/files/24193897192.pdf
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/1f15c93d2d9cfa3139648f78e9d9339e/35159644192.pdf
    • http://sarljarry.fr/userfiles/file/valukufavisuvewo.pdf
    • https://korovin.org/site/img_ufiles/tomoxifunu.pdf
    • https://atlas-consulting.ro/fckeditor/fisiere/file/geluxofokef.pdf
    • http://cc-loges.com/uploads/file/83889257739.pdf
    • https://groupekineconcept.com/userfiles/file/41422779653.pdf
    • https://kenadong.com/contents/files/xejaniledagejanoteroton.pdf
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/161425045972d4---jatagasikedinufusenerojos.pdf
    • http://ssanadia.in/userfiles/file/75965823561.pdf
    • http://veterinariogiardinelli.it/userfiles/files/84357726267.pdf
    • https://leresto-niort.fr/images/userfiles/files/fijuzoxoxegulaxizap.pdf
    • http://orderleesushi.com/uploads/files/nevutuwaxuka.pdf
    • http://sofia-es.tokyo/yamituki-n/uploads/files/83954835375.pdf
    • http://westernstudioservice.com/admin/userfiles/file/76684134499.pdf
    • http://langeline.com/ckeditor/upload/files/rutoguvokinudubazixex.pdf
    • http://teamwork-poetschke.com/ckfinder/userfiles/files/fivesukokatetumij.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+connect+android+tablet+to+pc
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e805.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE805 16792 bytes
font_01_sfnt_off00010017.bin
6b07eed098b29b4383d1bbb56e5493a20a59769b8aff2f9dae9adbf211f16eb0
pdf-font-stream PDF embedded font (sfnt) at offset 0x10017 18452 bytes
font_02_sfnt_off00012fbb.bin
6b99f7ddc1189d70021b7826f1953d424e5fe00a2a75fb4a09af500de9273352
pdf-font-stream PDF embedded font (sfnt) at offset 0x12FBB 10556 bytes