Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e24e273eef7fed2…

MALICIOUS

PDF

78.2 KB Created: 2021-09-17 10:09:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: ff0c0e7dd31f760b6e90cb422bc815d8 SHA-1: 5d9ff8581bacb345e187fe23926db74eac3bc889 SHA-256: 4e24e273eef7fed28cd36e84a436b4bb51a693a6196718b33570eedf0ae1842d
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as a phishing trojan. It functions as a link farm, containing numerous URLs that point to various websites, some of which are hosted on compromised CMS uploads. The primary purpose appears to be directing users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://avenue102.com/uploads/file/guzisekanugetasugakos.pdf In PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/161309489cd83c---36377907525.pdfIn PDF document text
    • http://pascalparrot.com/uploads/assets/file/roxatulokovolo.pdfIn PDF document text
    • http://shippingengineering.com/files/ckeditorothers/vuxakijuzasorabititivunid.pdfIn PDF document text
    • http://bestpokeya.com/uploads/files/lexerotub.pdfIn PDF document text
    • http://chuabenhxuongkhop24h.com/images/files/vapisini.pdfIn PDF document text
    • http://videocycling.info/files/file/41062692726.pdfIn PDF document text
    • http://33podarka.ru/pictures/files/zinikopipikisetivesawela.pdfIn PDF document text
    • https://mmtours.si/uploads/zuverok.pdfIn PDF document text
    • http://lepal.sk/ckfinder/userfiles/files/73231050499.pdfIn PDF document text
    • http://mitchelllawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/59849356877.pdfIn PDF document text
    • https://markiza-trade.ru/admin/ckfinder/userfiles/files/voretedijiwixudisuviside.pdfIn PDF document text
    • https://livredart.com/ckfinder/userfiles/files/85306538046.pdfIn PDF document text
    • http://fruitvita.com/files/files/luwesov.pdfIn PDF document text
    • http://mundialimportweb.com/userfiles/file/41173723886.pdfIn PDF document text
    • https://gruppopolidori.com/upload/image/file/18953606709.pdfIn PDF document text
    • http://yibetter.com/data/files/65141278131.pdfIn PDF document text
    • https://europartner2.pl/uploads/jixamo.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140bbdc469c8---82680921158.pdfIn PDF document text
    • http://www.bongbansaigon.com/uploads/files/gavan.pdfIn PDF document text
    • https://auto826.vnpec.xyz/uploads/files/naniru.pdfIn PDF document text
    • http://palmdale.thepokeluau.com/uploads/files/96706144671.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/36682dd7f99ba873e6eb145b9a9b67d8/kapiwavuginu.pdfIn PDF document text
    • http://zjgjqmr.com/v15/Upload/file/202196426155116.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=mathematics+d3+7th+edition+textbook+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_off0000cc6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e484.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE484 11288 bytes
SHA-256: d894b57afd94f34efaa3ace0293f66468e1dde52d53a05ca8a20f8381eb507c6
font_02_sfnt_off0000fec1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC1 16960 bytes
SHA-256: 277a522367de485d0dba0e918b1c45b7bf01e60625d394a38f9beea83c275c6d