Malicious PDF — malware analysis report

Static analysis result for SHA-256 a56df8bc3b1bd712…

MALICIOUS

PDF

75.9 KB Created: 2021-10-12 14:37:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: cf3ea832411eded2223fb6fc844104f7 SHA-1: 204c57b7bd3fef036f86d7366b646bb90d7034f8 SHA-256: a56df8bc3b1bd7124959fff9e5ed2b4214cbf321e030febfd14ec12da28bb5bd
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • 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.jasolasia.com/image/upload/File/wuvezutikizafe.pdf In PDF document text
    • http://archpiudue.com/userfiles/files/refaxudibeda.pdfIn PDF document text
    • https://kibledergisi.net/resimler/files/peginuzibigi.pdfIn PDF document text
    • https://wyslijpaczki.pl/app/webroot/files/userfiles/file/zenuvet.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16154023773f10---8000265289.pdfIn PDF document text
    • http://ikuma-car.com/js/upload/files/sexefevew.pdfIn PDF document text
    • https://acavacecio.it/userfiles/files/59858054226.pdfIn PDF document text
    • http://architettoangeli.it/userfiles/files/likijefilogilabutoju.pdfIn PDF document text
    • http://testsitehq.com/ckeditor-ckfinder-integration/uploads/files/37387486602.pdfIn PDF document text
    • http://fujiya-la.com/uploads/files/wipuxi.pdfIn PDF document text
    • http://mertcelikkapi.com/userfiles/file/74062628869.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16162757b6883d---53224656900.pdfIn PDF document text
    • http://citysoupsbellevue.com/uploads/files/73016064372.pdfIn PDF document text
    • https://nilsahost.com/calisma2/files/uploads/66110844243.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1616560bb04245---nazazojato.pdfIn PDF document text
    • http://eastindiaspray.com/suvra/eastindia_spray/files/kejoruzu.pdfIn PDF document text
    • https://parisnordmedical.fr/docs/file/viduwowafutabagat.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/161380a1406dd1---vubizuboziwudepebevulokav.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/venowojukazijik.pdfIn PDF document text
    • https://metrosecuritynepal.com/assets/userfiles/files/97597292756.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/36249b0cf44906c374dc79f8d24bb9f3/fejukazatuza.pdfIn PDF document text
    • http://tz5168.com/uploadfile/image/2021/10/08/file/20211008_182258_190.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///13146723127.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/7813aece81895ac1a1af6c1e1cc0d0e7/85112441564.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/TxADE9PCSUw/uplcv?utm_term=throat+swelling+after+tonsillectomyPDF 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_off0000c3b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3B1 10944 bytes
SHA-256: 1b04a407ffd6e3ca0a03c68bcea98cc7d0ba01b508444cd5ecd8d91efeec9106
font_01_sfnt_off0000dcf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF8 17008 bytes
SHA-256: 73c7ef19ec76827efea2dd54c3c2f65e2ae4b271b353bcf4a4ea1eaf77115226
font_02_sfnt_off00010993.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10993 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1