Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cf3c430832b0c0a…

MALICIOUS

PDF

92.8 KB Created: 2021-09-11 21:09:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e45460b9a46b87435f5e97bd45981284 SHA-1: fa85cc017c9ef9e9d2372b5199c9033640ceb2dd SHA-256: 1cf3c430832b0c0ae8165f7920aa95fdca93f8d58cf883f78e7930bddc57b290
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs, while some are marked benign, contribute to the overall pattern of directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c9994ec9c1---69355794368.pdf
    • https://brod-plovdiv.com/images/21059691606.pdf
    • http://vitrine-prof.com/files/xabujopewutasola.pdf
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613118862fcc9---17102116801.pdf
    • http://hengtaixin.com/HangShun/ckfinder/userfiles/files/pobosejoxo.pdf
    • http://stin-verdon.fr/assets/Image/files/68853183340.pdf
    • https://worldmedglobal.com/userfiles/files/wimexurefowilixi.pdf
    • http://wmsone.com/eimages/file/xugodotavak.pdf
    • http://ewtch.com/upload/files/zujojowawepu.pdf
    • http://hangquangauto.com/files/bodaxivedokadonobo.pdf
    • http://zpkprzemysl.pl/ckfinder/userfiles/files/56752683476.pdf
    • http://opusbiz.kr/data/editor/file/200779311761332b7e067f0.pdf
    • http://pawsandtiaras.com/ckfinder/userfiles/files/lagoluta.pdf
    • https://karlholmbygg.se/UserFiles/files/13263847916.pdf
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fed864c521---wibemepasavelugusokuved.pdf
    • http://kozszemle.hu/uploads/files/rowop.pdf
    • http://lotusburbank.com/uploads/files/nezipasosi.pdf
    • http://rc-saty.cz/gais/image/file/zejuxufepewideze.pdf
    • https://foodphotoshop.com/userfiles/files/sizeru.pdf
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/11c9c030bae2f22c1fb0376628e16629/rarizemibinuduvemiku.pdf
    • https://lotteppta.net/beta/assets/file/pibijivipagefububub.pdf
    • https://everywheregenes.com/uploadfile/qu26_qu106_com/files/64465520689.pdf
    • http://csc-0411.com/userfiles/file/20210904235944_tvgokm.pdf
    • http://an-professional.ru/img/files/file/wusivorigebakasapexaviwux.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=watch+logan+lucky+online+free
    • 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_off000109c0.bin
60c0ffe68e91ab458cd98b3959d312760bf600f3360e71dde9cca00ccec28785
pdf-font-stream PDF embedded font (sfnt) at offset 0x109C0 10748 bytes
font_01_sfnt_off0001227c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1227C 16792 bytes
font_02_sfnt_off00013a8e.bin
c2f8e183720a4cb55e16bba8c67c6e8254d592bec37f6ceb2f6ae1a0cca6ce48
pdf-font-stream PDF embedded font (sfnt) at offset 0x13A8E 16908 bytes