Malicious PDF — malware analysis report

Static analysis result for SHA-256 55200488bb412827…

MALICIOUS

PDF

85.4 KB Created: 2021-09-02 02:25:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 828a984b4ac9026a456bcbcf93b4d3de SHA-1: d5ab83047ce29d2e68aa22c5d75b5d9414aefc80 SHA-256: 55200488bb412827ce1471c85cdf17ea1caf80f845b91734b2d366b5c4368611
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites. These sites host further PDF files, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16092d99b24516---91605128510.pdf In PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d10da7db93---bevavurojapinoro.pdfIn PDF document text
    • https://shiokuda2.com/contents/files/fuwulujafoloruzitonaxefe.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160735ac3ebec7---vegamizid.pdfIn PDF document text
    • http://moonlightmontessori.com/upload/files/20001463091.pdfIn PDF document text
    • https://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/fst3ashrm09mcc5j2c82d9bbfc/rozidovigibulozopafejamas.pdfIn PDF document text
    • http://scouttautomotive.com/editor_uploads/system/files/9402426646.pdfIn PDF document text
    • http://dalboncostruzioni.it/userfiles/files/65827584264.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081c863f1b40---70995767424.pdfIn PDF document text
    • http://sincaremedicaltour.com/js/upload/26399909096.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097b4d22b49d---xifofativazoz.pdfIn PDF document text
    • http://beijingbeat.com/contents//files/82807170014.pdfIn PDF document text
    • https://kalyna.ua/sites/default/files/userfiles/file/fuwodasizixor.pdfIn PDF document text
    • http://jaht.com/userfiles/file/soramivedidatuva.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/8af4567884dde029d9fc7cefcb732e9a/povutuzijalujus.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/botepijazubiz.pdfIn PDF document text
    • https://fa-vietnam.com/webroot/img/files/lawivovavaf.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160981523eb86f---3183555784.pdfIn PDF document text
    • https://imagebuzz.net/ckfinder/userfiles/files/53142543351.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bfea5539a3c---66322632547.pdfIn PDF document text
    • https://xn----7sbbjg7ctfs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8d0bdbddd55af7710daf0819bcacb1d9/59190669891.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f2521b3069d---77225617887.pdfIn PDF document text
    • http://cablexconsulting.com/Upload/file/tupofovitebuvafeg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=my+cat+meowing+at+mePDF 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_off0000ea44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010256.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10256 17600 bytes
SHA-256: 978e48262e514c3a0b203fa88c973fa2bf7629b2be21e8125732e5c9849ca88a
font_02_sfnt_off00013009.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13009 10452 bytes
SHA-256: cc1f694fbaaa4a7287fc0097d744aef81ecdbf3111bcbf996ca035a86e0a4e35