Malicious PDF — malware analysis report

Static analysis result for SHA-256 88f90df998006729…

MALICIOUS

PDF

76.7 KB Created: 2021-10-01 09:52:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: ef27deedc28956b7b5c2e0341800540b SHA-1: 34d9123048b2784cef7f602368a4a43c3d5148f3 SHA-256: 88f90df9980067296c4ca9668f8412e04e88a928175711e0eb40770ceddc0331
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also features a large number of links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://motoren-adachi.com/js/upload/files/50592183316.pdf In PDF document text
    • https://hv2barrier.com/application/third_party/ckfinder/userfiles/files/99875312126.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615571cf98c0e---najafitojewet.pdfIn PDF document text
    • http://presssimayeshahr.ir/pic/file/9290958761.pdfIn PDF document text
    • http://pune-india.info/userfiles/file/vakunajepifaxaruminififap.pdfIn PDF document text
    • https://kitapkaplama.com/upload/ckfinder/files/45091238865.pdfIn PDF document text
    • http://highspiritsmusic.com/ckfinder/userfiles/files/16269577562.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/161567419b953e---wotaninil.pdfIn PDF document text
    • https://soalmatematik.com/userfiles/file/dironawuzedim.pdfIn PDF document text
    • https://autoradiator.mn/uploads/ckfinder/files/5889768818.pdfIn PDF document text
    • http://zimmerei-possert.at/91423271620.pdfIn PDF document text
    • http://robvancampen.nl/userfiles/file/libanez.pdfIn PDF document text
    • http://halaljones.com/uploads/files/tijiguzi.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/l935r2d7o37vuj8kg186a738e7/notavutojokifulobowu.pdfIn PDF document text
    • https://cfi-registration.amyhalter.com/buzzboxgift/img/userfiles/files/pasilujofuduzozur.pdfIn PDF document text
    • https://client-sms.com/ckfinder/userfiles/files/wubugisejuronominibituno.pdfIn PDF document text
    • https://fishboat.hr/files/donuzelezajata.pdfIn PDF document text
    • https://kaemsp.org/upload/editor/file/jizudoriboxipenolozeraw.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/83356168402.pdfIn PDF document text
    • http://alltechsro.cz/files/36801899130.pdfIn PDF document text
    • https://cliniquemyo.com/userfiles/file/pixulupubotowisadebu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=ems+no+tracking+indiaPDF 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_off0000bea3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d6b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B5 20224 bytes
SHA-256: 52dfd89d8a0049f34653e14bb3812871be314274ee8c10aad89b1f9702bd9a8d
font_02_sfnt_off00010bcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BCD 10608 bytes
SHA-256: 8b7bfbb6a02e47a871de249de3e1a8217be7d890800391c5169cd7a607652251