Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0c8caaf9738ac42…

MALICIOUS

PDF

82.8 KB Created: 2021-08-19 02:14:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1699cad321e856f02ebb804783f6f451 SHA-1: 46c9d7455cad9df7461d15aac3fd77cac2d31dff SHA-256: a0c8caaf9738ac423174dfde83bc2a2aafa4b852eab01ffec1f3a05cb32f5f69
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting a link farm designed to manipulate search engine results or lead users to malicious content. ClamAV and ML classifiers strongly indicate malicious intent, consistent with phishing or SEO spam tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://victoryelectricalsupply.com/ckfinder/userfiles/files/32441209248.pdf In PDF document text
    • http://budka39.ru/files/mobopikopizomipimu.pdfIn PDF document text
    • http://diamant-x.sk/UserFiles/file/78294891743.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a593174c91a---rapudejokevaxasasi.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f32dceeba---73408378697.pdfIn PDF document text
    • http://186086.com/upload/files/tagurefenadevixatezibu.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/duzexajesesutari.pdfIn PDF document text
    • https://willmarareachamber.com/ckfinder/userfiles/files/22746855430.pdfIn PDF document text
    • http://noospc.ru/SITE/files/editor/file/13042721047.pdfIn PDF document text
    • https://actaviaserica.org/board/file/files/gikovetekanubivefurirediv.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/a1f591eabf7f857fce2e859b923d6cee/87384244191.pdfIn PDF document text
    • http://graficaeformazione.it/userfiles/file/sugugigebesavawimis.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/a44h1k06ek6ocs8notnnu536d4/7734968523.pdfIn PDF document text
    • https://wonkingchina.com/d/files/40205472631.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/b69fee92f2c37fdb66f6f76169daada2/21713361335.pdfIn PDF document text
    • http://ecole.ru/text/images/file/gatuzukigawunedafi.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc0208c6638---sojodezemeg.pdfIn PDF document text
    • http://mjsolankifoundation.com/fck/imagesfile/71860109511.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b2651aa01ee---6791074640.pdfIn PDF document text
    • http://adveotec.com/img/file/25886994740.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/7461240453.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/q94qfp4lf650c2hscmjouppqb3/20699717303.pdfIn PDF document text
    • http://superfishinglewood.com/uploads/files/79282139905.pdfIn PDF document text
    • http://cuatudongsaigon.vn/uploads/files/58864044571.pdfIn PDF document text
    • http://sanfrancescovet.com/userfiles/files/jegejirosofawinewi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=3+year+old+milestones+speechPDF 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_off0000dfc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC0 10968 bytes
SHA-256: ad39d98884e20a0160ae79d68c01caaacae2983e3186e263076e5d927e84a4f9
font_01_sfnt_off0000f901.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF901 16388 bytes
SHA-256: bb6d26e6e105cfdf75725e285122d6a8c4b05896263e7004573c5175b778cfe0
font_02_sfnt_off00012375.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12375 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1