Malicious PDF — malware analysis report

Static analysis result for SHA-256 df4d4f1c294898b8…

MALICIOUS

PDF

82.5 KB Created: 2021-09-15 07:22:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3946af1ffe221a8c50127b3acd79cd0f SHA-1: 8a9eccf253cab682fc2889aec305ba46c1e45dab SHA-256: df4d4f1c294898b865b3218739719ca40eb8d4ee6147a5221336a48e62a17740
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous external URIs, many of which point to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users. The presence of these links indicates an attempt to lead the user to malicious content, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://huntic.ru/uplcv?utm_term=turkish+drama+online+app PDF link annotation
    • http://rasciindia.com/firetech/ckupload/files/nokamiko.pdfIn PDF document text
    • http://orikon.net/Images_upload/files/5400603140.pdfIn PDF document text
    • http://primaria-ciocirlia.ro/media/file/49652447999.pdfIn PDF document text
    • http://jikaramen.com/uploads/files/30950975208.pdfIn PDF document text
    • http://nail-free.com/ckfinder/userfiles/files/24114656404.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613179d8ccea7---66481711966.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/18521646556.pdfIn PDF document text
    • http://www.dogwoodagility.nl/ckfinder/userfiles/files/37980719645.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/xurubozefawuwobefupegu.pdfIn PDF document text
    • http://kanchanaspa.com/ckfinder/userfiles/files/26321591526.pdfIn PDF document text
    • https://ppkh.net/userfiles/file/fasifukupagab.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1612f647b48b5f---mefunuwi.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/009b9cda2c7acf5bd406162eeae7ca14/kofuporusijutatu.pdfIn PDF document text
    • http://lso-msm.com/userfiles/file/33620090485.pdfIn PDF document text
    • http://greenearthgardens.org/userfiles/42040230558.pdfIn PDF document text
    • http://soc-in.com/data/media/files/witor.pdfIn PDF document text
    • https://fwstc.in/userfiles/file/52067397799.pdfIn PDF document text
    • http://romengo.com/ckfinder/userfiles/files/zafebez.pdfIn PDF document text
    • http://www.waetsukai.jp/system/ckfinder/userfiles/files/15865618760.pdfIn PDF document text
    • https://immsac.pe/sgi_userfiles/userfiles/files/38598540177.pdfIn PDF document text
    • http://urs-certification.com/gais/image/file/87352869253.pdfIn PDF document text
    • https://ermolino.mebel18.com/uploads/files/wudadibibulujusowilun.pdfIn PDF document text
    • http://timnhanhonline.vn/upload/files/powogeturut.pdfIn PDF document text
    • http://seyrimerdin.com/userfiles/file/26440065025.pdfIn PDF document text
    • http://ondrejkocar.cz/img/file/82964932666.pdfIn PDF document text
    • https://pui-vital.ro/msg_media/file/99586678135.pdfIn PDF document text
    • 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_off0000de5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f670.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF670 17600 bytes
SHA-256: 666194048e8c8848fb58606f2a0f4018fecd7c6d79350cba447d52e6f6e6e378
font_02_sfnt_off000123d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123D4 10712 bytes
SHA-256: 7e4b0a9b7f09f995d1d877b3f6803307059de9772d8436a80e1970d8d0b0e774

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