Malicious PDF — malware analysis report

Static analysis result for SHA-256 daedeec62aeea6d1…

MALICIOUS

PDF

74.2 KB Created: 2021-09-06 08:55:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 29d0287c201aea827fdd92e2c7e2c0c8 SHA-1: f148000defcf3c47319b94a04181778fbb621362 SHA-256: daedeec62aeea6d18da2aa13233cde10d070b28b82dd9f7385636f1f79966bc3
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a PDF link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs, while numerous, do not appear to be directly executable but likely lead to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • 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.
  • 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://unicaconsultoriarh.com/images/files/xokusanemuliwapuleguv.pdf In PDF document text
    • https://dp-engineers.com/admin/userfiles/file/81132311958.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160deb72403c85---fepuziluverifulawupuwoti.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/13043847977.pdfIn PDF document text
    • http://weingut-suppan.at/files/belelufajom.pdfIn PDF document text
    • http://7166867.ru/ckfinder/userfiles/files/maburapexazebufobewabixij.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160e4607c44c4d---jemuk.pdfIn PDF document text
    • http://sam-global.info/files/file/15737927489.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/guvit.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160db81379d93f---sumupuxaw.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bf2339b3ca---zujadexibomufif.pdfIn PDF document text
    • http://ktcyy.com/ckfinder/userfiles/files/gosekivuzixasa.pdfIn PDF document text
    • http://reguitti-engineering.it/userfiles/files/70303603629.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3ce88fdc3---vuterasujatefadow.pdfIn PDF document text
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wodolinunisew.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161043619d6377---53126208483.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/161290034ae4ba---fajatiduvevifutevutuz.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/0792a3aa87579469b1fa95adf9744b9b/gegifirezikiwanijukeva.pdfIn PDF document text
    • http://omeofest.eu/userfiles/files/pirumidopum.pdfIn PDF document text
    • http://soles2walk.cz/data/file/89419053998.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/bf06756b542dbf5f47917b4dfcb2fc95/dorijuterujofas.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///38607515708.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/nolerasaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=joie+every+stages+car+seat+manualPDF 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_off0000bfa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFA8 10844 bytes
SHA-256: f6b989082e88b58e6008df6c6ea05f6439be75f74b781f4c833fa0fc59f8e329
font_01_sfnt_off0000d8c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C7 16520 bytes
SHA-256: a1b26e241bb43881ef7abae684ba2109186029632fb8330579b118c7dd94022b
font_02_sfnt_off00010370.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10370 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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