Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1a12da0a7c79e04…

MALICIOUS

PDF

82.1 KB Created: 2021-09-09 06:37:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 7851e860f711fc0d9e458ea34652ddc7 SHA-1: 6a6176f63e998a1236ba1e44972c2dd78c4341c2 SHA-256: c1a12da0a7c79e04a427812b21d69b588fe05abeee2544bc344e8546877c35bc
164 Risk Score

Malware Insights

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

The PDF contains a link farm hosted on multiple domains, some of which appear to be compromised or disposable, suggesting an attempt to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL findings point towards a lure for downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.bsa.by/ckfinder/userfiles/files/bobanusipelizidova.pdf In PDF document text
    • http://reutlinger.pl/userfiles/file/tazojizasulilugumun.pdfIn PDF document text
    • https://khanikango.in/file/rezaro.pdfIn PDF document text
    • http://yung-shun.com/userfiles/file/togijuviratizigiwor.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133cede3f6a0---zazuwunonedidolal.pdfIn PDF document text
    • https://www.hkha.com.hk/ckfinder/userfiles/files/76986042977.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/12047860183.pdfIn PDF document text
    • http://youzedu.com/ckimages/files/20210906191008516326.pdfIn PDF document text
    • https://rosedreamholidayhomes.com/ckfinder/userfiles/files/jogisawalinifowafikuzaj.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130938288386---63968567889.pdfIn PDF document text
    • https://perfecthospital.org/ckfinder/userfiles/files/16907534387.pdfIn PDF document text
    • http://855solution.com/htdocs/cljr/data/files/77262029848.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/bopokitigibesene.pdfIn PDF document text
    • http://movitecnic.fr/ressource/site-image/files/gozenudo.pdfIn PDF document text
    • https://kiptep.ru/file/34553986054.pdfIn PDF document text
    • http://kesherisrael.com/uploadEditor/files/83847796106.pdfIn PDF document text
    • http://www.brickchamber.com/ckfinder/userfiles/files/83983412621.pdfIn PDF document text
    • http://tzoetemondje.be/uploads/files/webafiz.pdfIn PDF document text
    • http://reckdance.pl/userfiles/file/xagutixulavik.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/merevivexinogisino.pdfIn PDF document text
    • https://tigapilar.com/upload/files/57845297092.pdfIn PDF document text
    • https://swagath.co/new/ckfinder/userfiles/files/67243044529.pdfIn PDF document text
    • https://svarovanijelinek.cz/ckfinder/userfiles/files/40629263195.pdfIn PDF document text
    • https://everestart.com/images/stories/file/vapixebexajikinapiweweki.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/gl5gdpf8i8u1505glrj1ag6nh6/zalonodijotojesu.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/2887373059.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=offline+gps+appPDF 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_off0000dece.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDECE 17384 bytes
SHA-256: e52573931177492fff8a8d514a973c15c0f1aa59df3a654d83714286e1a57003
font_01_sfnt_off00010b87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B87 10240 bytes
SHA-256: ef514bc17dfa8d830d32c986fc358f852f12423ca8f34a4cef76b345aa4a2330
font_02_sfnt_off000122a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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