Malicious PDF — malware analysis report

Static analysis result for SHA-256 40023007f40c405f…

MALICIOUS

PDF

85.8 KB Created: 2021-08-24 18:24:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4d6dc5d98b16cf200cfd43535659ed0e SHA-1: 839dcfee7d0328c5fa91b4fd115996a2b01d5b1a SHA-256: 40023007f40c405f34ffc9159678f70b5bd04566c35cd02ef7340c05037549e1
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple domains, some of which are hosted on compromised CMS platforms or appear to be disposable. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure suggests an attempt to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 6

  • 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.
  • 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://ip-golubev.ru/ckfinder/userfiles/files/wufaxax.pdf In PDF document text
    • http://bernardthevenet.fr/ckfinder/userfiles/files/buzedas.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/f7b7011fdde216de84837cd34655a104/47671700205.pdfIn PDF document text
    • http://pietroquatriniarchitetto.eu/userfiles/files/daxivulitigufipo.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160fd00a199d35---13093972997.pdfIn PDF document text
    • https://cqc-material.com/app/webroot/userfiles/files/sokoxojizivixujaji.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/161234c75627d4---kosewelelikizufixogit.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/g452g8gmij4c8e2pdai9h34hd2/47433429600.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/16105806a8843c---vedawalezifiwofiwede.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/77517750318.pdfIn PDF document text
    • http://bhs1966maui.com/clients/64750/File/99177232306.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7fcbb4ab4f---38279719209.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c03d5af2108---julefukim.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/af44ece81f00c30b2c15f21efaa061b1/duvafejanapeguzu.pdfIn PDF document text
    • http://nuitsdartistes.eu/images/file/nigemerenekoxikem.pdfIn PDF document text
    • http://designbeginnings.com/upload/file/85896561183.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1c14199f08---6073489806.pdfIn PDF document text
    • http://urjabatteries.in/userfiles/file/kivugugaba.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160742331aa1f0---xoxirafuzosisik.pdfIn PDF document text
    • http://fertilityupdates.com/userfiles/files/15369537956.pdfIn PDF document text
    • https://supermagnum-bg.com/userfiles/file/ziravozu.pdfIn PDF document text
    • http://koreaseals.com/ckfinder/userfiles/files/73253603530.pdfIn PDF document text
    • https://ndmoyun.com/calisma2/files/uploads/sizakuwoxuzusifujolapi.pdfIn PDF document text
    • http://gtlmarinefuel.com/userfiles/file/5746473566.pdfIn PDF document text
    • http://luckdidea.com/ckfinder/images_store/files/jikoxomonewovaxagakizojux.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f49390e125---roxukagovitubojiredowuri.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=retail+industry+in+india+2019+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_off0000e8de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8DE 11092 bytes
SHA-256: 8f9f3bea929d637caa235c44271d438118401b9603d7a69506d281a88fb8ce69
font_01_sfnt_off000102f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F0 17604 bytes
SHA-256: 59831e9d31e3b639dcbe57c0e516cdf867dafc1a77492aa170f2992b0fc9313e
font_02_sfnt_off00013164.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13164 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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