Malicious PDF — malware analysis report

Static analysis result for SHA-256 99cc9670b9f3702f…

MALICIOUS

PDF

96.8 KB Created: 2021-09-07 14:25:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: d1bd61e2e9166a372c73695b0a9bb4a5 SHA-1: 52164889b286b020277d88d5d55f50ae2d8b135e SHA-256: 99cc9670b9f3702f00a5631551010a3bea4e2438bb94124094799037bcf6e488
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and a link farm pointing to compromised WordPress sites, suggesting an attempt to deliver a payload. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway security. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a985e60fd67---22216175603.pdf In PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a78878a4e7---xakowijeberanariborivomu.pdfIn PDF document text
    • http://cc-loges.com/uploads/file/pazatonagotef.pdfIn PDF document text
    • https://www.winsum.frl/ckfinder/userfiles/files/83679746988.pdfIn PDF document text
    • https://bnbtravels.com/ckfinder/userfiles/files/4999510035.pdfIn PDF document text
    • https://dbmotorbrokers.com/userfiles/file/dimijorezamomilivitix.pdfIn PDF document text
    • http://noithatdangcap.vn/app/webroot/uploads/files/gegakorogetedololokuji.pdfIn PDF document text
    • https://wangwangcamp.com/uploads/files/202108132352432698.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/0697ikkek5dbjthp49257eoe91/majejinep.pdfIn PDF document text
    • https://immobilgold.com/file/2242974740.pdfIn PDF document text
    • http://giasudaihocsupham.com/Images_upload/files/47816220309.pdfIn PDF document text
    • http://navrattan.co/userfiles/file/81995067375.pdfIn PDF document text
    • http://ceramicaartisticamarsalese.it/userfiles/files/3223294264.pdfIn PDF document text
    • http://logisticsnetworks.net/ckfinder/userfiles/files/87617239177.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/92630744208.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/jquhfpmqecoj0lkpu0tpkarou6/40184704338.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/26590765337.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/23198412926.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/3c3bfcfb9f4e9d87b730f179058150f8/vubakefawa.pdfIn PDF document text
    • http://lycee-elm.com/userfiles/file/87236819746.pdfIn PDF document text
    • http://gold-carsales.com/js/upload/files/kukasosinilegalonatom.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/d042c151d41a325c788b23825316ce6a/gakasidofikug.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1609b9a370f802---koxuwowugago.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078d1a9b22b4---bulogopow.pdfIn PDF document text
    • http://messtores.ca/fck_user_files/file/68165195378.pdfIn PDF document text
    • http://93564497.com/userfiles/55604706212.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=design+of+reinforced+concrete+structures+volume+1+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_off00010b2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B2C 20360 bytes
SHA-256: b47defcc5bae0a68fe9fcd64eec83e54a39f47015fbe3f464aff7547e07785c5
font_01_sfnt_off00014111.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14111 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015928.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15928 11020 bytes
SHA-256: 1d649693e94f3598be2ac385f43d8208deb0c3820efff7c3ac2879891816d3bf