Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e8136bcc32db655…

MALICIOUS

PDF

85.6 KB Created: 2021-09-17 12:11:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 52d06c39bab5ce0ba968530cac984fb8 SHA-1: 37e1ba9bf87dc3ce0e552db2452fe60838af2da9 SHA-256: 6e8136bcc32db655ac78fc3b05068a61270c1b24aed5efacdd227809150789d9
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous URLs, many of which are part of link farms hosted on compromised or disposable domains, suggesting an attempt to redirect users to malicious content or phishing sites. The presence of multiple external URIs and link farm structures indicates a high likelihood of this document being used to distribute malware or facilitate phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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.
  • 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://huntic.ru/uplcv?utm_term=star+walk+2+free+download PDF link annotation
    • http://nollve.com/img/editor/image/file/wezorejadeson.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/035fd2ee84fa701365deeb3bd851f87f/97107815770.pdfIn PDF document text
    • http://kaizenlife.com/ckfinder/userfiles/files/ganasewirilifazibo.pdfIn PDF document text
    • http://net-work.cz/data/file/miwemepudediwisetaruzu.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/161405ec6a3488---mazavewavar.pdfIn PDF document text
    • http://diskacme.dk/images/upload/file/17434274544.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/71991636078.pdfIn PDF document text
    • http://www.kymenhome-etsinta.net/tiedostot/files/rogez.pdfIn PDF document text
    • http://studiochiodo.eu/userfiles/files/dozaxozonexezakiwekeju.pdfIn PDF document text
    • https://drnanemilk.com/tctt/sites/aaa/file/74449493182.pdfIn PDF document text
    • http://pc580.cn/upload_fck/file/2021-9-12/20210912191631111497.pdfIn PDF document text
    • https://thebillionbottom.com/business_school/uploads/file/68787145754.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/1af70f4fd4b6395ef408b4b4e8002c77/totojuxonulateba.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143da8b9ac4b---80597573863.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/9edec69ab554aab2310f3b7f837bab4b/61413118381.pdfIn PDF document text
    • http://wadsoda.com/UserFiles/File/92691042974.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614420b714610---nudigereluremurofo.pdfIn PDF document text
    • https://ntct.dz/ckfinder/userfiles/files/veliwanujorigamijujoxis.pdfIn PDF document text
    • http://www.injamal.es/nueva/ckfinder/userfiles/files/20493961343.pdfIn PDF document text
    • http://bakersfield.thepokeluau.com/uploads/files/nubamutoda.pdfIn PDF document text
    • https://www.rougeindigo.com/ckfinder/userfiles/files/ladaxoleb.pdfIn PDF document text
    • https://konzolstudio.ro/uploaded_files/file/momajubeguwovutepidaxa.pdfIn PDF document text
    • http://yangpupark.com/uploadfile/files/24842022943.pdfIn PDF document text
    • 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_off0000ea6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA6E 10460 bytes
SHA-256: ce362c657dc71cdecd327882726b142156351e63e5bb17a54ca34b0e7a7ed352
font_01_sfnt_off0001026e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1026E 17764 bytes
SHA-256: f78e3da122a016adc3df68f1df9f8d920735bbe19565e23da806def5c410fc0a
font_02_sfnt_off000130a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1