Malicious PDF — malware analysis report

Static analysis result for SHA-256 237a2338756f282a…

MALICIOUS

PDF

99.0 KB Created: 2021-06-30 08:22:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 5ef716c586c898de4bf2dbca9fee3fc3 SHA-1: 81abbf62637d6f040227888aa73ee06a8130cfc8 SHA-256: 237a2338756f282a708af959b42bc08ff13f3c959fabc0f4cb77ff275b6cb813
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV. It contains a link farm pointing to compromised CMS upload directories, suggesting an attempt to distribute further malicious content or phish users. The presence of multiple distinct hosts and a high number of links per host indicates a coordinated effort to obscure the true malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160737301bd03a---sobemuf.pdf In PDF document text
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/a985048c028059bce4a19dfbb44648d1/70684542719.pdfIn PDF document text
    • http://iphysiology.ru/upload/gudogawugitogomimokulafi.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa77ff28ae5---79313564631.pdfIn PDF document text
    • http://residencecarlofelice.com/userfiles/files/56948052512.pdfIn PDF document text
    • http://digitalpolicycouncil.com/imagenes/file/99757430210.pdfIn PDF document text
    • http://mabo-meccanica.eu/userfiles/files/1978846276.pdfIn PDF document text
    • https://ngusacdon.com/upload/files/fanupodibizapeje.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/22b9bca2c3048f2d0ea5a3612dc050cd/vemotu.pdfIn PDF document text
    • http://asfalon.com/__files/file/jivosabaluni.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/e6vmk94tl53hbi0muo3lo1ssee/bujitofuzesofunutijopopa.pdfIn PDF document text
    • http://agriturismocorteerbatici.it/userfiles/files/lurago.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/wirif.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/80d931dc674cb22679206d2fc99d785e/nisevuvifinudub.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/feb0s4kq8ikg0sbmcsvlfimq8i/82452543100.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607d52b7cd9ef---dowapaxosororoxizek.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/13h7llisdlku5ddnhotraatq9v/ruwagejatizugopo.pdfIn PDF document text
    • https://aannemingsbedrijfbarthulsbosch.nl/userfiles/file/26265075334.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/2dseed0sp2gmvnkup612tidctk/19519679262.pdfIn PDF document text
    • http://alexhofford.com/temp/files/file/fafabetusuxofukabuzopet.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/12qbpepmcsep8dhbb70j7sstm7/megixekesabokom.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c5200c99dc7---jigiwize.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=function+of+nucleus+in+animal+and+plant+cellPDF 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_off00012319.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12319 16564 bytes
SHA-256: b14b8adb3ceb7fa058f705e31eb86325e013b552dd994cc022c95b70b9d87198
font_01_sfnt_off00014dde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DDE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000165f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x165F5 10756 bytes
SHA-256: 8483566300aa867408c17f1ad5b824c4b9f6ba160547ab4b481fd853601d220f

Open this report in the interactive analyzer, or submit your own file for analysis.