Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb8950fb3ef9d940…

MALICIOUS

PDF

86.7 KB Created: 2021-09-16 13:10:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d4e748ca48700f42b665d159340c6f27 SHA-1: 1abd4cba26ec6bd659ea0bf7eef6e7ea5378a8ab SHA-256: cb8950fb3ef9d940b590e742eed0efb4cef0e815e00f582ec536dc6a9f375649
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to potentially compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The document's structure as a link farm suggests it's designed to lure users into clicking through to malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613df2b43fd17---57611538938.pdf In PDF document text
    • http://ipllaser.in/uploads/10222665843.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/hgenj5fvb3tja7i2bq8qp4jip6/rituw.pdfIn PDF document text
    • http://eqletstalk.com/uploads/files/202109080649511536.pdfIn PDF document text
    • http://avandcie-energy.com/ckfinder/userfiles/files/61763456953.pdfIn PDF document text
    • https://am-system.eu/ckfinder/userfiles/files/ratavaperimaxew.pdfIn PDF document text
    • https://www.vpn-solutions.com.pe/ckfinder/userfiles/files/moxemifesutidezepajivole.pdfIn PDF document text
    • http://ever0036.com/assets/uploads/ckedit/files/20210903144719.pdfIn PDF document text
    • http://makesomenoise.hu/upload/file/womufadakizuliwinipinubi.pdfIn PDF document text
    • https://pepsima.biz/files/file/xetorekiwusuto.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/70877943707.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138263cd0d01---70897306667.pdfIn PDF document text
    • https://cissud.com/uploads/ck_editor/files/7515631973.pdfIn PDF document text
    • https://turbooto.vn/upload/files/57548928925.pdfIn PDF document text
    • https://vokalensemble-vocembalo.ch/userfiles/file/kixole.pdfIn PDF document text
    • https://chambredhotes-savoie.com/ckfinder/userfiles/files/44536092432.pdfIn PDF document text
    • https://globalcareerclub.com/FCKeditor/userfiles/file/16274837485.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/460455a5b3cfed21a1b43dce2b1c4a54/retotavuwedozanowefepasup.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/cc3b190315246ea1347bc705bc2d2801/75136086413.pdfIn PDF document text
    • http://woodlander.sk/grafika/file/xigekoxuxetowatufiwaje.pdfIn PDF document text
    • https://marsanz.pl/uploads/fck/file/maxawem.pdfIn PDF document text
    • http://avvolodin.ru/upload/file/vowet.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/55386704684.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=chuwi+hipad+x+antutuPDF 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_off0000e41e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE41E 22680 bytes
SHA-256: 38b66837767f9d3974664942a24a1bec58f399fdef9eb79ec09fb5ff16d974ac
font_01_sfnt_off00011f29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013740.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13740 10240 bytes
SHA-256: 531eb35d1efcd87d0c411482465d03c8daf2754e79aa269da283cf7d0d819b36

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