Malicious PDF — malware analysis report

Static analysis result for SHA-256 c805bf37132044d8…

MALICIOUS

PDF

78.4 KB Created: 2021-07-30 13:45:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 722cf0fe5f8b695f91ee94b4b90373e7 SHA-1: 1ab6d73f8f3cada0ad0d2bd0963cbf4cc24be39b SHA-256: c805bf37132044d8c617055e1bb9d33ae46dbb5d8d0817a3a7742c8e4a7e1ea7
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous distinct hosts, many of which are hosted on disposable domains or compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or to serve a second-stage payload. The embedded URLs suggest a redirection chain designed to obscure the ultimate destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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://eva.am/files/efb372b49e257f47.pdf In PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c19ffe3ab6---35618579945.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/59b30160558bec40482390fa110981b0/8785582498.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///40220090340.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/2pc13oc80nq01i2ad5b7ljhcnp/ranukuwig.pdfIn PDF document text
    • https://villamishkan.com/310renonew/front/images/files/69834098391.pdfIn PDF document text
    • https://www.ndgai.com/wp-content/plugins/super-forms/uploads/php/files/b90b3qslf3n22ou3mbdbokrf8o/60819551421.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/26467338602.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/6hd7ki6g5cl6q7dheal2dvtln6/52734909028.pdfIn PDF document text
    • http://yngc.ru/admin/ckfinder/userfiles/files/sukik.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16080c0a34102b---90863161363.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609f8112a1616---xedimoluwutor.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160f4517b26f04---91985982949.pdfIn PDF document text
    • http://worldnaturalfood.com/image/upload/File/rawinej.pdfIn PDF document text
    • https://edinburghpools.com/contents//files/nugekaburigewetoso.pdfIn PDF document text
    • https://metricgroup.it/uploads/file/47704745637.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160908acad8d96---kabijasokebuworige.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/igmqidtkfls3itcomq7dsjkqb1/34104694211.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/7087042c3b83866958bf800a2b2ad1b9/86975599049.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c68d913b4a0---tejivosozixebusixelegowek.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/67355158061.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/e94s68entelgl76s758v794ua0/14010493704.pdfIn PDF document text
    • http://elitaliaweb.it/upload/file/bujizupunufitek.pdfIn PDF document text
    • https://hzautomatisering.nl/userfiles/file/xosopujafozuxarorite.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16092dd869fd2a---86444839551.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/k2sff56m4cdlrfabmgnnhv1mh1/86608664339.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=petrucci+genel+kimya+2+%C3%A7%C3%B6z%C3%BCmleri+pdfPDF 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_off0000c6e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6E8 11768 bytes
SHA-256: b89c61b7479bf992fb9fd63ee8f46ea27da3534709916b24b255aa89ea678f89
font_01_sfnt_off0000e219.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE219 18476 bytes
SHA-256: b7692d0724bf9c7612cdd2b5ae882b601d3d2d390b9d6259651079deab77763b
font_02_sfnt_off00011053.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11053 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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