Malicious PDF — malware analysis report

Static analysis result for SHA-256 27b33048f128de1a…

MALICIOUS

PDF

78.8 KB Created: 2021-08-15 13:21:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e13a0fd6901739b9d1fbed419ba077a8 SHA-1: 2aa28d76b60f5665aae60af23d38cb7099899f8e SHA-256: 27b33048f128de1a5621333bd5d281f2b63ba95591161ade43bfe82d7afe189d
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple domains, many of which appear to be compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of numerous links to potentially compromised hosting suggests an attempt to obscure the ultimate destination or leverage existing vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/161164b03bba6a---gezidisezulobitigivikexof.pdf In PDF document text
    • http://designklasse.de/ckfinder/userfiles/files/rasitaboxexofomumise.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/93376996991.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071fcf47deec---rujakudike.pdfIn PDF document text
    • http://skyfestival.kr/ckfinder/userfiles/files/51878272895.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/givozetivudavekorebosuna.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/c65e046da6e374cd3d0c005b53a13221/wejozerujipe.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf56207b68c---26536986686.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160771092d9233---16651324515.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16087de4accd85---18980049458.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/2o2ivmgkq8k1dkacljh87qfirq/77231909669.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/51e3b972d01d1fe449a1b681c0a1c23b/20606178658.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608df9568a9e8---boxukobobiburav.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160dac2aa400f4---16742925607.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/wovalojijerokem.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0db85b9da---demekukinemoladoberi.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16093b66dd2deb---691221892.pdfIn PDF document text
    • http://studiogiovannone.com/userfiles/files/kivozofugitol.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/mefakonaberu.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160754611cb013---maragogu.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/r1s3es7uf8epj7eqdmii5v4u6g/17574726854.pdfIn PDF document text
    • http://nenorm.com/files/files/29615504148.pdfIn PDF document text
    • http://screen.by/images/file/jinelodinijugebafef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=lecturas+de+comprension+lectora+para+cuarto+grado+con+preguntasPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e636.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE636 17304 bytes
SHA-256: ac5f77e7504bc967c2bdb5122547780d604d02d5043d44a66b4836ea53d816f8
font_02_sfnt_off000111e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111E2 10916 bytes
SHA-256: 0569f2e37ce3a58d1d105c988fb1060087835f7492970cd42b6d322071255899

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