Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc40d2d72cfede8b…

MALICIOUS

PDF

82.2 KB Created: 2021-09-03 01:48:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6ebf6ab866647824413fed4ce3f100bc SHA-1: 24e050aa8b0b99e91d23addedfa391684503a05d SHA-256: fc40d2d72cfede8bf8bfddd718e4d3d31c81cfb4e6d28e574ddb2479d46cc64a
176 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of an IP address literal in a URI further indicates suspicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://kalikraft.com/images/file/23397469983.pdf In PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/74bg840qdtvr5melccttd46drk/kebagipirawijak.pdfIn PDF document text
    • https://ritascreation.com/userfiles/file/78720772991.pdfIn PDF document text
    • https://pcstaiwan.com/ckfinder/userfiles/files/7713981173.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609840c4dd20f---90536219742.pdfIn PDF document text
    • http://sartor.ru/upload/files/61414738082.pdfIn PDF document text
    • https://espiber.cl/images/uploadedimages/file/52330523279.pdfIn PDF document text
    • http://140.121.161.111/ckfinder/userfiles/files/musunuregakowewitu.pdfPDF link annotation
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/omhtr8sroqpcv9jeku2bt2d5op/11338758898.pdfIn PDF document text
    • http://3qbuy.com/CKEdit/upload/files/lonufizitadu.pdfIn PDF document text
    • https://healthtecindia.com/userfiles/file/wesotisenuwu.pdfIn PDF document text
    • https://fullhousetourism.com/UploadFiles/file/20210722063356129.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/7cpm27iitngffpou8npgr7ne2f/23382374668.pdfIn PDF document text
    • https://belhasasecurity.com/userfiles/file/40431762807.pdfIn PDF document text
    • http://srsheicha.com/uploadfile/file/basonosupurometitike.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1609c54b3485a4---59840955792.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/02aad315972d14114c88b12f4d57d149/watozopalesivutowo.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c7a214ca800---dezopizamafelife.pdfIn PDF document text
    • http://fdscience.com/UPFILE/userfiles/files/debugopisebetepuzifedipor.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160803c5f034cf---60749986628.pdfIn PDF document text
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/a6763c0af8a40fed510a95a19c6f5ef5/1386848309.pdfIn PDF document text
    • http://technocom.pl/editor/file/97914437286.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1fa0b1e3c5---2931702165.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=seema+anand+the+art+of+seduction+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_off0000daa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA1 18220 bytes
SHA-256: b566d35d259639aacb23cd977935ef21ec3b45edcca1e3fcdfe5c01d59f587f4
font_01_sfnt_off000109e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121FF 11016 bytes
SHA-256: 0910a0ecc8b8ed912645fdcac75602057e979267dce6f81f5ac36fb1715cf967