Malicious PDF — malware analysis report

Static analysis result for SHA-256 0409893088506e8c…

MALICIOUS

PDF

90.1 KB Created: 2021-09-04 03:07:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e9efc30b87aeb57e2ac2785b8bfc9697 SHA-1: db9a357a6bf900f281f79479c4ddc9fe9d8f62ef SHA-256: 0409893088506e8c1759f030aec373b7e4e20b96b4e64eef8f7dfed8adda18a2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS uploads or are part of a link farm hosted on disposable domains. The presence of JavaScript actions within the PDF suggests it may be used to execute malicious code or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. 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://queure.ru/uplcv?utm_term=design+methodologies+in+software+engineering+pdf PDF link annotation
    • http://cana.vn/uploads/userfiles/file/jizewo.pdfIn PDF document text
    • http://www.psoealora.es/ckfinder/userfiles/files/75147696493.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/94ba7c1e393cda7f994a797759ddcf7f/dojuzufijoxawu.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/85596000972.pdfIn PDF document text
    • http://katachizu.com/img/news/files/mepafufagadimoxadesemub.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160873ed8c3bec---88600589799.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/18our7tq1d6r1ceqabqhaah8a9/filozifoduruzoragapi.pdfIn PDF document text
    • http://ixtvs.de/_upload_bilder/_filemanager/file/84695743276.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1611c6d402ff9c---tagemuremilumusixid.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160723e58c6c4c---88965489166.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/9e52894d2990ebfdd9e57d9fa0a58b16/notenotugoruvum.pdfIn PDF document text
    • http://grupopiscis.com/upload/files/watine.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0609e4b4f1---xusunuvegebeg.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9bcc3f29b4---wawekawebipebuzukon.pdfIn PDF document text
    • https://dalton-english.com/userfiles/file/52321590646.pdfIn PDF document text
    • http://rehahomecare.com/upload/editor/files/mavoda.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609277a1523ef---62965263626.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/92365891640.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/13468153584.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/guboriwaniduletupekixelen.pdfIn PDF document text
    • http://ekogamma.pl/javascript/ckfinder/userfiles/files/sibujezo.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb38faea581---80175024550.pdfIn PDF document text
    • http://studioego.cz/userfiles/file/41141718759.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/jokizilikepetijuwubigavas.pdfIn PDF document text
    • http://karat-dobremiasto.pl/userfiles/file/84760608576.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_off0000f913.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF913 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011125.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11125 18288 bytes
SHA-256: 863270a38f209c1b6677a4f9593809a096f5c30c81a1ac81c3b14792d6dab73a
font_02_sfnt_off000140cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140CF 11032 bytes
SHA-256: 3f105f402f46098bc90d9affca942b08e4eafc4003abfbd25d56433e27816b6b

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