Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dd089f5bba2bf92…

MALICIOUS

PDF

69.8 KB Created: 2021-10-03 05:27:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 4eeccbbfb95d9811b3a1c8d2d36aef96 SHA-1: 1abd239663d929f1bc3448160536f07815df57aa SHA-256: 9dd089f5bba2bf92345a122ea690dfce4036fbfca6cb1e6ec7a4b734a7c6b6be
116 Risk Score

Malware Insights

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

The PDF is identified as an image-only lure, typical of phishing campaigns. It contains a significant number of links pointing to compromised WordPress upload directories, suggesting an attempt to host malicious files or redirect users to phishing sites. The ML classifier strongly indicates maliciousness, supporting the conclusion that this document is part of a malicious distribution chain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 6

  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/161324db35d3c7---tadilarurarimes.pdf In PDF document text
    • http://rockbond-aac.com/id-admin/fckImages/file/naxigu.pdfIn PDF document text
    • http://onmamtour.com/FileData/ckfinder/files/20210916_07C55EA6877678CA.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/161581d5f95197---wepemurelagef.pdfIn PDF document text
    • http://sity-luxe.ru/userfiles/file/96546797510.pdfIn PDF document text
    • http://savaksangida.com/resimler/files/turededumutanovilibur.pdfIn PDF document text
    • http://americasbestwingsbeltsville.com/uploads/files/puriposumopifirenapaba.pdfIn PDF document text
    • http://lscapital.it/images/file/bisidosaxagugotot.pdfIn PDF document text
    • https://fullhousetourism.com/UploadFiles/file/20210926053131106.pdfIn PDF document text
    • http://problemconsulting.com/img/download/files/xorib.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/5835cff552567bc055faf52531b14e02/41328226499.pdfIn PDF document text
    • https://emmaushuis.org/pages/bigofugokawigenisa.pdfIn PDF document text
    • http://jinruily.com/UploadFile/file/20210910140612021.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/e852f6001413ddd804faecba011dc762/bepogebofitunip.pdfIn PDF document text
    • http://wedding-box100.com/uploads/files/202109050701092668.pdfIn PDF document text
    • https://panificioilcavaliere.it/userfiles/files/roderefagedatu.pdfIn PDF document text
    • https://aprenda-atdi.com/uploads/files/51660083361.pdfIn PDF document text
    • https://greenlakecruises.com/ckfinder/userfiles/files/40592527690.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/161489c564af3c---39471194628.pdfIn PDF document text
    • http://saothienemb.com/uploads/images/files/76682208332.pdfIn PDF document text
    • https://hssanesteban.cl/files/xukejowupof.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140591c33e94---texitofazo.pdfIn PDF document text
    • http://autofox.lt/ckfinder/userfiles/files/fatirinasikuturelaxoro.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/8703287680.pdfIn PDF document text
    • https://www.bnbtravels.com/ckfinder/userfiles/files/24106838633.pdfIn PDF document text
    • http://benevolo.it/userfiles/files/zodopufatosodusowikos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=diversification+means+that+an+investorPDF 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_off0000b561.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB561 14232 bytes
SHA-256: f4c46b42021ff3d67f79a04466e86da97c5dc883faa41af6230a5fa447910c0a
font_01_sfnt_off0000d88b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD88B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f0a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A2 10624 bytes
SHA-256: f481081e0c7f3226326b3492d32a6025c794b8b771aac4ffe1459134b0c2ca4c