Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc625fada93737e8…

MALICIOUS

PDF

78.1 KB Created: 2021-09-07 06:58:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 549c64f69cd3535f0ffc53cbe80bdec0 SHA-1: 72109770eb8c75fb093d17b84be79d12345fb50b SHA-256: bc625fada93737e87da673fa93ca4d2aa795acca3c4e8ba1fb6a9c378ba8059d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised websites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed as a link farm, likely to direct users to malicious content or phishing sites. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://chcial.ru/uplcv?utm_term=riemann+hypothesis+proof+pdf PDF link annotation
    • http://chataphan.com/file_media/file_image/file/werifuwilirenupufa.pdfIn PDF document text
    • http://cuborh.com/natelinhanew/js/ckfinder/userfiles/files/82507999768.pdfIn PDF document text
    • https://fcr-fomentoconsumoerenda.com/uploads/files/nusufuzozuwamogupis.pdfIn PDF document text
    • https://globalathena.com/ckfinder/userfiles/files/gaxugaxebasiwifopoz.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/1607715b26bc48---70430269009.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/92981984344.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/8e75197be19043eaf8c8e1cd9f74442d/modoferomodajazibi.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/ac791b930b9ec94d083f826102c75783/fuzasaluso.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/iqnschss5h1eo7je2akigfqtnm/18723797999.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160798dae79984---gafejudesoteninazifupubon.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/56362603651.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/hfqj2s0jvjqs8cehhf35bgtpm2/6043632422.pdfIn PDF document text
    • https://bem-sa.com/img/file/25357053536.pdfIn PDF document text
    • https://sjamsul-hidajat.id/ck_uploads/uploads/files/4650776694.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ace1401cd36---kegogenuzoripozi.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/5e3831fe1b0fdac4040b34416d032982/selowokiviv.pdfIn PDF document text
    • https://wfbulgaria.com/uploads/wysiwyg/files/gerevi.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/bgttpncvn99hpkg967oc61dc8v/kilewed.pdfIn PDF document text
    • http://imaginove.eu/data/Files/42453614509.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/rikop.pdfIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/87fe46f53478c5431cefc877dcd5a40a/47694178690.pdfIn PDF document text
    • 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_off0000ccbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCBC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e4ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4CE 17208 bytes
SHA-256: dcc5a8d646ac4db3dc5229cfdc78018a5102afa8337326f7c459069887c8a4f6
font_02_sfnt_off000111e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111E3 10876 bytes
SHA-256: 5b92f0618cd6cb2a3d9ee46dd4215ef209d6e1276b7579a30a3ba2b9c16e1ce2

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