Malicious PDF — malware analysis report

Static analysis result for SHA-256 d41de1d2c78e3308…

MALICIOUS

PDF

85.3 KB Created: 2021-07-04 05:54:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d82e32ea64704ec657fe4ee591adacc1 SHA-1: 30ef4af6291d4343047bfc64c29837d5fa2c478d SHA-256: d41de1d2c78e33088b464bfffa76412eb86ae4d55db5f0e7f85f30062540c478
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress sites hosting other PDF files. This structure is characteristic of a link farm designed to distribute malicious content or lead users to phishing sites. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/16081c796632ce---rizarofokasafu.pdf In PDF document text
    • http://stalmont.eu/userfiles/file/sorinadurobajotipiwesa.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/1bcf277fb9bc329abdd2ad5f96ce398a/sujawamutidavu.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/vudujilamirapojobab.pdfIn PDF document text
    • http://toyotacri.com/userfiles/files/lepawutojodinodax.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/71bbef8716bff7d9170964c1d0e64b85/29703153491.pdfIn PDF document text
    • http://myxroad.com/upload/userfiles/file///13080894231.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/3kdg8ghjm3hgj7tjlq8a75l70d/nikew.pdfIn PDF document text
    • http://ilovegabal.net/fckeditor/_upload/file/nabala.pdfIn PDF document text
    • http://coffee33.ru/archive/file/lekof.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/9b60be1e07d1e14f14999367386ded1b/sowubabavizapaxefokos.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/584d93956f307930a056c29268522f0b/2906861233.pdfIn PDF document text
    • https://mk-sito.it/uploads/file/67415326787.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/50467036678.pdfIn PDF document text
    • http://teplospectr.ru/images/files/61433249139.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/84811479768.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a7786003b9b---22139715219.pdfIn PDF document text
    • http://upoart.com/ckfinder/userfiles/files/nitabavakunawabegipu.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/35274379427.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/63c5ae0aee56c1bd5758dca95642a0b3/xonuputajatini.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160986d7b08d8c---betibotuzoguf.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a64131504fb---10365578383.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160983e551e135---rivalobejoredokewa.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/18e6087a33a44d3c868717fcec621b50/71897160648.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=nut+bolt+weight+chart+in+kg+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_off0000e78c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE78C 18036 bytes
SHA-256: bf6666d971c5b264469694763959074ceb1d05391608e5c8d03663cd5e0fd2f8
font_01_sfnt_off0001167e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1167E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E95 11124 bytes
SHA-256: 3c69815a87f9cd34b916be7f4e7c19a6d7ea4647dba31b7ba47fa213c2ad9f31