Malicious PDF — malware analysis report

Static analysis result for SHA-256 f65cefbc473a2fd1…

MALICIOUS

PDF

70.4 KB Created: 2021-09-29 12:21:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2407f8c7886dd53173b138db5e3fa6b5 SHA-1: 97e180a4bebf067d53872b0bfbefbc8b1adbd8cf SHA-256: f65cefbc473a2fd1121b2a8224c210fa6bf31ea15495882cac3d4b94428b9eff
164 Risk Score

Malware Insights

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

The sample contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities and delivering malicious content. The PDF also includes numerous links to compromised WordPress sites, suggesting a phishing or credential harvesting campaign. ClamAV detection and ML classification strongly indicate malicious intent, likely involving the execution of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/a9a9tuql49lr2vimhv2jq4gn23/doxurexidizido.pdf In PDF document text
    • http://teusz.pl/UserFiles/file/77479956427.pdfIn PDF document text
    • https://shriramsteels.in/public/ckfinder/userfiles/files/95791241721.pdfIn PDF document text
    • http://muntepa.com/userfiles/files/metiwigukojobed.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/0be90fa596d9367cddb9ee6614178b9c/faworaxurevavegivuna.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/malomegolekinoxenudofimo.pdfIn PDF document text
    • https://www.vek-bg.com/app/templates/js/ckfinder/userfiles/files/57668003217.pdfIn PDF document text
    • https://tonymusic.se/UserFiles/files/temovososebinemisiwufi.pdfIn PDF document text
    • http://myapartment.de/web/editor/files/tozepogewamas.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/lavorewegasunugitag.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/4v8o1qh8hg1f7o2lkharmgbdcg/90528438043.pdfIn PDF document text
    • https://mavachhaiphong.com/upload/files/ridoz.pdfIn PDF document text
    • http://tele-fonika.pl/upload/file/30726675553.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/4v5niaarqsqu2f21v4fib6smm6/purutofisugu.pdfIn PDF document text
    • http://stroyvodservice.ru/upload/File/rinadiwuw.pdfIn PDF document text
    • http://xmzhj.com/UserFiles/file/pikozezirufijitufuvazugog.pdfIn PDF document text
    • https://pmms-online.com/assets/file/43487716684.pdfIn PDF document text
    • http://alumcity.ru/userfiles/file/notajivevaxeveluwaxew.pdfIn PDF document text
    • https://www.sibirprokat.ru/ckfinder/userfiles/files/vinokufutukinodal.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/f74744337591b755414cbff358ab78c1/95855741851.pdfIn PDF document text
    • http://abbuffalowings.com/uploads/files/89335234901.pdfIn PDF document text
    • https://indianhairtransplant.com/ckfinder/userfiles/files/sujidixuluduwogazet.pdfIn PDF document text
    • http://studioego.cz/userfiles/file/zifezegom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=airplay+2+on+android+tvPDF 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_off0000b2ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2FF 10364 bytes
SHA-256: 4bef3be8d80b98e94d743fafaf53b6cd4d0fcee585779ec8889928bbeb98b7e1
font_01_sfnt_off0000ca93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e2a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A5 16180 bytes
SHA-256: 795dcf307bb336a722899175ef5df84e68a789c14bee6a7c86d8a44fd806b3c0

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