Malicious PDF — malware analysis report

Static analysis result for SHA-256 aaf6e2dbee79e9b2…

MALICIOUS

PDF

77.6 KB Created: 2021-09-19 00:13:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 267be23273ef7705d0a3a3e3654bb8c5 SHA-1: 5f70e4b6f0ea788730cb62cc3efcf8b4dd0b247a SHA-256: aaf6e2dbee79e9b231c04984987a673a3ee3cfbfd46ef348e05fc86666353c1b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' suggests links to compromised WordPress upload storage. These findings, combined with the ML classifier and ClamAV detection, strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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.
  • 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 https://oniceh.ru/uplcv?utm_term=how+to+transfer+my+phone+number+from+android+to+iphone PDF link annotation
    • http://patriabrno.cz/userfiles/files/92346162357.pdfIn PDF document text
    • https://meritumptt.pl/dokumenty/file/puvimakijini.pdfIn PDF document text
    • http://industrialsupplies.pk/userfiles/files/zuvazokenasirogutexobev.pdfIn PDF document text
    • http://weiken-rc.com/upload/files/90031022620.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/1fcf8da71cc3f511a9ae4fc63d8542f1/49324512908.pdfIn PDF document text
    • https://amgaa.org/temp/files/dodimalakubokozagat.pdfIn PDF document text
    • http://aiaato.com/FileData/ckfinder/files/20210919_996947485087C1FE.pdfIn PDF document text
    • http://sculecuacumulator.ro/app/webroot/files/userfiles/files/7893666282.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5e5f0eb45---13846637045.pdfIn PDF document text
    • https://www.nevjegykiraly.hu/userfiles/files/wonaxagukozasijekasodaxik.pdfIn PDF document text
    • http://fsgzb.com/upfolder/e/files/20210911135638.pdfIn PDF document text
    • http://casaledellasignora.it/userfiles/files/jiluvitinudipukuxejilafo.pdfIn PDF document text
    • http://fabriquetextil.com/js/new/fckeditor/userfiles/file/57960805434.pdfIn PDF document text
    • http://neoclassicalmansions.com/uplds/file/36282496704.pdfIn PDF document text
    • http://drcleancenter.com/uploads/files/202109041424439053.pdfIn PDF document text
    • http://avs-market.ru/admin/ckfinder/userfiles/files/76670063084.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614422fecbdf5---bupogajajejutag.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134877951e3a---65716428815.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/vobibugelelotak.pdfIn PDF document text
    • http://www.gpkoaee.ru/ckfinder/userfiles/files/42573489002.pdfIn PDF document text
    • http://hycxchina.com/filespath/files/20210902230725.pdfIn PDF document text
    • http://fotografieindex.nl/images/uploads/1972023947.pdfIn PDF document text
    • https://nedimgame.net/calisma2/files/uploads/36103312374.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_off0000ca0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA0B 17116 bytes
SHA-256: dfefdb02b9ca919af0d59c7e7aba237c1e0a67e3e99c13a830841d0d5766c412
font_01_sfnt_off0000f64e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF64E 11148 bytes
SHA-256: 05e8924a523e1b918266a206375180a76d5caa6a93628b7cd2cab4167cb27fd7
font_02_sfnt_off00010ff9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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