Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d4e3b6f258c2287…

MALICIOUS

PDF

81.7 KB Created: 2021-09-20 09:02:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 268073f216aa17cdbfda7437a97fc1c7 SHA-1: c54e78d5e11a1924d94df70ce0292efef607a5ca SHA-256: 6d4e3b6f258c2287cb06e80e2d029fffbeaca38a90a6a5c0e4a705168e4c3dd6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on potentially compromised WordPress sites or disposable domains. The presence of JavaScript suggests an attempt to execute malicious code or redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://jadeite.ru/images/file/88659696809.pdf In PDF document text
    • http://asv-solnice.cz/_files/file/mabizatamitigivizogutiv.pdfIn PDF document text
    • http://vo23.ru/upload/file/fisufatetep.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/161382c358f902---guxoxirijokara.pdfIn PDF document text
    • http://architetturaurbanistica.it/userfiles/files/70558273229.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/41546a8986a686ea793417091df4937e/29355338135.pdfIn PDF document text
    • http://mediasingrid.com/js/new/fckeditor/userfiles/file/21099803803.pdfIn PDF document text
    • http://chinawin-consult.com/userfiles/5622526827.pdfIn PDF document text
    • http://kirakuramenandsushi.com/uploads/files/85593677001.pdfIn PDF document text
    • http://csc0898.com/userfiles/file/20210903081707_vfl3m6.pdfIn PDF document text
    • https://www.gico.ge/ckfinder/userfiles/files/xelabukavumu.pdfIn PDF document text
    • https://hrmconsulting.biz/upload/files/39242791489.pdfIn PDF document text
    • http://www.vandiestbrandstoffen.be/uploads/files/31044502706.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/7ab6d8e63d2a5a216ebb065c3100b088/jitoxudobeti.pdfIn PDF document text
    • http://eastendmediation.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/64981054858.pdfIn PDF document text
    • https://ingatlansos.hu/images/userfiles/file/4729217185.pdfIn PDF document text
    • http://uk-finansist.ru/userfiles/file/55204570362.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16146b20d1e4bb---16384056894.pdfIn PDF document text
    • https://all-stage-meditation.tw/uploads/files/613fa7dfcec34.pdfIn PDF document text
    • https://sankaibearing.com/userfiles/files/52005900548.pdfIn PDF document text
    • http://srs-budapest.hu/uploads/files/fupenetug.pdfIn PDF document text
    • http://www.sloepverhuur-debiesbosch.nl/upload/files/purotigexoxasetitaworifa.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143b4a668b41---sanufukasemikexifebe.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/20546739949.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=swype+keyboard+for+iphone+6PDF 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_off0000dbca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBCA 17284 bytes
SHA-256: 932fdd465af46e3a89e9022a81ea9fe5d274c508b4b933008a7cd32e084ce215
font_01_sfnt_off00010851.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10851 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012068.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12068 10960 bytes
SHA-256: 35917693e5972e25b7bf616fa4f6697791e4e83d6b3184e37886d73931a795db

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