Malicious PDF — malware analysis report

Static analysis result for SHA-256 486f4853d74698e8…

MALICIOUS

PDF

87.3 KB Created: 2021-09-20 15:21:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 22cc35bafedb8d4ba5e14ab71f024c6d SHA-1: 8f18a16a9cf05a754d000f1d00791c71407e2b63 SHA-256: 486f4853d74698e875aeaa57d5db8be61b3864f96b85e3625161e6733c87270d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier. It contains numerous external links, including one pointing to a compromised WordPress upload directory, suggesting a link farm or phishing lure. The presence of embedded URLs and the PDF structure indicate it's designed to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://altaamir.ipixpms.com/Rapport/public/assets/ckfinder/userfiles/files/83843441693.pdf In PDF document text
    • https://bimstudioinc.com/media/files/nozujun.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/62549110028.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/834afdf5b7910262e3fe406c7fbd6d0a/85017784902.pdfIn PDF document text
    • http://ogledalata.bg/uploads/pages/files/garuzew.pdfIn PDF document text
    • http://tainghe.vn/userfiles/file/kuxenidote.pdfIn PDF document text
    • http://westfallassociates.com/documents/file/rumagogexi.pdfIn PDF document text
    • https://liantoong.com/archive/upload/files/26007957001.pdfIn PDF document text
    • http://xn--9i1b14lzokxjcrti5um.com/upload/fckeditor/file/peravepupixelakeguzixonil.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161417dba9f89d---95558691939.pdfIn PDF document text
    • http://daeryuhealthcare.com/ckupload/files/rirejasumulinikepu.pdfIn PDF document text
    • https://festacontinua.it/public/file/xulebijomolejasopopil.pdfIn PDF document text
    • http://www.primariasantana.ro/uploads/file/fomutenuwitemum.pdfIn PDF document text
    • http://gowowdeli.com/uploads/files/53251177652.pdfIn PDF document text
    • https://tmtteks.com/files/zivudidomire.pdfIn PDF document text
    • https://tour-paris-guide.com/cite_imgs/file/36368455689.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135e72370b39---22419115615.pdfIn PDF document text
    • https://rajakeempat.com/contents/files/17148492100.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/b7fada16ce4b6b0c0043d03627ef9bc6/datakowigudovojud.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/7605294103.pdfIn PDF document text
    • https://postelezmasivu-zlin.cz/ckfinder/userfiles/files/39155917506.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/rifusu.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/45172947168.pdfIn PDF document text
    • http://geometracosentino.com/userfiles/files/65019243033.pdfIn PDF document text
    • http://bfttacg.marketsearching.com/upload/files/11488736916.pdfIn PDF document text
    • http://thriftstorewebsites.com/flash/thriftstorewebsites.com/file/pexepakaberufepik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=free+fire+apk+2021+pcPDF 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_off0000f41a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF41A 10300 bytes
SHA-256: 615cfbfbd8338bdcc6557256a22c2b06633b013f771bfb9d115afeb559c7f775
font_01_sfnt_off00010b7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B7B 17084 bytes
SHA-256: 32d11afe2f7ad7ea1816514365ef522d80b9241c3423f7573c66c21a129faaea
font_02_sfnt_off0001379d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1379D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1