Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf05440bdcac59d5…

MALICIOUS

PDF

70.9 KB Created: 2021-09-15 10:34:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9304456fbe2652c3e09a46bf8e0fc1dd SHA-1: 998f400a86d769663644a3578404919bb01c33b2 SHA-256: cf05440bdcac59d5d2d0d702df5651905234b007b72bae0d4fb61e594dc21165
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://aletihad-group.com/userfiles/files/39177642047.pdf In PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/3a9e54ccc623176f8d7adf3407f23baf/58670811286.pdfIn PDF document text
    • https://zhavezbozi.cz/data/file/81350039866.pdfIn PDF document text
    • http://fixmyhelicopter.com/project-new/christianbook/upload_images/file/bigojisekijezaxigam.pdfIn PDF document text
    • https://egca.fr/userfiles/file/46850430934.pdfIn PDF document text
    • http://kingtonkatsu.com/uploads/files/61408339991.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021090602374551.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/pkiqgejubue26gobcq5v001tkp/36297477438.pdfIn PDF document text
    • http://mygotour.com/FileData/ckfinder/files/20210903_6D2AB40452C0C21D.pdfIn PDF document text
    • http://lulanjina.net/upload/files/17514014623.pdfIn PDF document text
    • https://bulendengin.com/upload/ckfinder/files/vuxagozojalesuvakofugub.pdfIn PDF document text
    • http://naoshima-tours.com/images/blog/file/92290752648.pdfIn PDF document text
    • http://metrocars.london/survey/userfiles/files/83014124905.pdfIn PDF document text
    • https://gamma-electronics-eg.com/userfiles/files/roduvebod.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/161402f464af69---14225621384.pdfIn PDF document text
    • http://coomargroup.com/ckfinder/userfiles/files/65299555595.pdfIn PDF document text
    • https://cissud.com/uploads/ck_editor/files/33287030607.pdfIn PDF document text
    • http://ilkconstruction.com/Images/Media/files/jipakowumuxiranamiwu.pdfIn PDF document text
    • https://viveironativodevicosa.com.br/ckfinder/userfiles/files/37214021667.pdfIn PDF document text
    • https://ekinyalitim.com/depo/sayfaresim/file/17735801745.pdfIn PDF document text
    • http://joelcsimonesq.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/7347140757.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/r6rduk0god7dtomv1kpfqenal4/35283938966.pdfIn PDF document text
    • https://www.karelo.com/uploads/File/lepuj.pdfIn PDF document text
    • http://bowlingkillers.com/imgdb/files/51001576712.pdfIn PDF document text
    • https://davidfauquemberg.com/home/fauquemb/david/bbdg_site/userfiles/file/zuzone.pdfIn PDF document text
    • http://doudou.tw/userfiles/files/54103247517.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=jet+set+radio+apkPDF 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_off0000b545.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB545 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD57 16348 bytes
SHA-256: e3074ca2eac78e9e0affbd6fd9664b1ed1e7fdc4812f2ae63a97a673d0ccaba5
font_02_sfnt_off0000f6d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D6 10316 bytes
SHA-256: 175c413ba38d14eb2c03dc71f7c02bdac99ea52fa6881b9576e2d80f116cc898