Malicious PDF — malware analysis report

Static analysis result for SHA-256 c412854bbc6c3145…

MALICIOUS

PDF

71.6 KB Created: 2021-09-26 14:44:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: b0f65b47f48f189cfbb53f61fc282669 SHA-1: c0e8850672813baac489ec1d4885df0298578151 SHA-256: c412854bbc6c3145a16ea046398071b4c12617718cdf79a4a060a6f328a860d6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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 https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/2f4bdc188285cec5056299efde9751ad/jikonuxosonusumamireweti.pdf In PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c364b21723---52198169076.pdfIn PDF document text
    • https://yuanfuconstruction.com/ckfinder/upload/files/86047178812.pdfIn PDF document text
    • http://grotech.in/userfiles/file/gajapijeze.pdfIn PDF document text
    • http://bnblspecialities.com/userfiles/files/20616214116.pdfIn PDF document text
    • http://autofactory-jin.com/js/upload/files/zatorodakobamiwifijinirox.pdfIn PDF document text
    • http://ever-pioneer.com/upload/files/56025567473.pdfIn PDF document text
    • http://www.web-globus.de/ckfinder/userfiles/files/zibebonixegedidelokumol.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/jofazelozo.pdfIn PDF document text
    • http://itemclinicchina.com/ckupload/files/baguxomuruwiwamuxilugow.pdfIn PDF document text
    • http://fosterfreezesantarosa.com/uploads/files/59339528919.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/44023085580.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614988c5dffd6---49939174272.pdfIn PDF document text
    • http://autosvilar.com/uploads/ckfinder/files/difasaderenetes.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/zoboled.pdfIn PDF document text
    • https://cafemocion.com/userfiles/file/68751175782.pdfIn PDF document text
    • https://rubenferro.com/userfiles/file/28326560151.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/sinix.pdfIn PDF document text
    • http://gewald.ru/content/Files/sabuwifigonuwumosoxumez.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/161353ec57db54---98116812990.pdfIn PDF document text
    • http://tverzhilservis.ru/foktver.ru/ckfinder/userfiles/files/91184694368.pdfIn PDF document text
    • https://faktxeber.ru/resimler/files/vibugaxalemojasuwitosifej.pdfIn PDF document text
    • http://northmarking.com/userfiles/files/jopolonusili.pdfIn PDF document text
    • http://cicm2015.mist.ac.bd/app/webroot/ckfinder/userfiles/files/84518421852.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=root+android+car+head+unitPDF 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_off0000b215.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB215 17728 bytes
SHA-256: 7a3a88b7bc22b6f63d296028316ac18dc0c0f8fb15e908bd80eda504c541c90b
font_01_sfnt_off0000e002.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE002 10400 bytes
SHA-256: 41a48fae62c7b732d2042aee0c8696bde78a744d7ddf695fb95ba0c0882194f3
font_02_sfnt_off0000f780.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF780 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1