Malicious PDF — malware analysis report

Static analysis result for SHA-256 9991614aabd683ea…

MALICIOUS

PDF

70.5 KB Created: 2021-10-02 13:49:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 94253e3b39b7e6811a6602ee8b39ecc4 SHA-1: d14acf4356bba8c878f2975ba2cc7ab9a3c23e07 SHA-256: 9991614aabd683ea88c81bcb41f447bea46a6dee804a90b483924f15b2cc5c02
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple external URLs, many of which are hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of numerous links on potentially untrusted hosting suggests an attempt to obscure the final destination or spread malicious content across various sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://doingthing.com/downloads/blog/geust/files/lexupotuke.pdf In PDF document text
    • https://siam-royal-view.ru/data/files/62277755265.pdfIn PDF document text
    • https://grnca.org/img/files/files/73408230504.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210906104442.pdfIn PDF document text
    • http://www.giuseppe.ru/ckfinder/userfiles/files/59814791673.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/01dd674f87c4f79951eb60f63c970969/98243161456.pdfIn PDF document text
    • https://sieuthigo.vn/upload/ck/files/60305121510.pdfIn PDF document text
    • https://springfordfarm.com/sites/default/files/uploads/file/dilupuguredo.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/101f189e08c52bf434b656e00cfb1ddc/55821965120.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/tujepiz.pdfIn PDF document text
    • https://we-plus.tw/ckfinder/userfiles/files/1395115500.pdfIn PDF document text
    • https://konteshamamotu.com/userfiles/file/23174883396.pdfIn PDF document text
    • http://eikenhorstgroep.nl/userfiles/file/vepewudasezewedefosawi.pdfIn PDF document text
    • https://swiz.eu/files/editor/bitisemikodapukifoguro.pdfIn PDF document text
    • https://zoomkish.com/basefile/zoomkishcom/files/46722182244.pdfIn PDF document text
    • http://mueblesdepladur.es/1/userfiles/file/31319324945.pdfIn PDF document text
    • https://www.pension-chevaux-haras-gabereau.fr/ckfinder/userfiles/files/tuzatez.pdfIn PDF document text
    • https://tonmathunglan.vn/upload/files/nobezugewaputetefu.pdfIn PDF document text
    • https://renebeumer.nl/userfiles/file/44519793941.pdfIn PDF document text
    • https://hostsolutions.ro/app/webroot/files/userfiles/files/duzewudurunikanuwipov.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0d0535cf5---88129469148.pdfIn PDF document text
    • http://bloodfaces.de/attachment/file/jezamejosadununevom.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146c47575f0c---nebumalowosipikaxa.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/81310004671.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=how+do+you+train+a+kitten+to+use+the+toiletPDF 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_off0000b338.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB338 10728 bytes
SHA-256: b03679f87550332781cf82244b232849b05239efd9a8146040e424a5d003b846
font_01_sfnt_off0000cbce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBCE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e3e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E0 15860 bytes
SHA-256: 8e91840f7989b7b7eae8c38076c4e8060908c3095c8291cae38392fa5ba335f3