Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b3be7b3727c9313…

MALICIOUS

PDF

92.3 KB Created: 2021-09-15 22:42:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 23c7929f6366672c7f09b4892a436193 SHA-1: a9adc3c99f9a9d4e9db2f5e502b9a53fbd27880d SHA-256: 4b3be7b3727c931317c80d27d2e876809121fdd0e91379636bbf71e0bae2be3d
156 Risk Score

Malware Insights

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

The sample was detected as a malicious PDF by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a link farm or phishing lure. The presence of these links and the overall structure point towards an attempt to redirect users to malicious content or facilitate further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://aranykoronakft.hu/userfiles/file/44119346922.pdf In PDF document text
    • http://nollve.com/img/editor/image/file/87278103162.pdfIn PDF document text
    • http://gestioniarmatoriali.it/bajetuxojenobopejig.pdfIn PDF document text
    • http://www.radanhorse.com/resource/files/mijemuge.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137f63a03692---ziwalaxafowuzonogolox.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131f5c1c3ebc---sobegimu.pdfIn PDF document text
    • http://jnejendomsdrift.dk/userfiles/file/2815693292.pdfIn PDF document text
    • http://hattingtoemrerogsnedker.dk/userfiles/file/gazuxobuguritele.pdfIn PDF document text
    • http://lctrading-gmbh.com/ckfinder/userfiles/files/dejurogabuwazavenon.pdfIn PDF document text
    • http://zzzwchem.com/upload/files/kezoviv.pdfIn PDF document text
    • https://soechi.com/userfiles/file/wujeresema.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/jobixuruwa.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/kekibuwetifosijiwazorelad.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/161369b1a3a0c6---37359164985.pdfIn PDF document text
    • http://mottaing.eu/userfiles/files/zuzezak.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/57881572685.pdfIn PDF document text
    • https://www.singaporemedicalclinic.com/ckfinder/userfiles/files/84796166783.pdfIn PDF document text
    • https://kidneystonetreatment.in/userfiles/files/4647784405.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16131a6592ec2e---fawadofibegutanu.pdfIn PDF document text
    • https://www.frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/tudimovar.pdfIn PDF document text
    • https://orcasproje.com/userfiles/file/13622290476.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/veovmjoda8grtfqtflhr734p43/xofapapixofemoretire.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=can+t+get+messages+on+androidPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA66 17276 bytes
SHA-256: d7afb698a2c9e370300a4c7bf296eb5fc3b1c58b91038bc1f9d88438a231f654
font_01_sfnt_off000116e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116E6 18200 bytes
SHA-256: 580f157a467bb42d8fef7648a5f4f8cb14979877fd5a5d64ffc202755c026ccb
font_02_sfnt_off000132f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00014b09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B09 10576 bytes
SHA-256: 5817de7db180ce00b80e46b6ea43bcd05c60c422dc490b4898d51dcce27ce3fc

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