Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a478dc81f3fc654…

MALICIOUS

PDF

82.7 KB Created: 2021-09-03 16:32:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 244d383578e812c3f15bf273dcad2d08 SHA-1: 450839f0618f6a6a8428b2b21ae80c254815c122 SHA-256: 0a478dc81f3fc65429b84eb8b0bde3d406f3c2375ead9f23a9622340806b99b5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection

The PDF file contains a link farm with numerous URLs pointing to various domains, many of which are hosted on compromised CMS upload directories. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The presence of multiple external URIs and link farm characteristics suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ee468513b42---94398725462.pdf In PDF document text
    • http://thepnguyentran.vn/media/ftp/file/tekazezoginisowoturo.pdfIn PDF document text
    • https://kocarbonag.com/luutru/files/rutivigatog.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/k6svb3h0h7b4nm6f7jgbs8vrb4/35188931690.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/c44939a42ab7014438b1d7fadbd78c69/nirazeginiwanugevalobe.pdfIn PDF document text
    • http://apvn.info/userfiles/file/23704840914.pdfIn PDF document text
    • http://modamoda.nl/uploads/pic_lib/file/32623759048.pdfIn PDF document text
    • http://cy2hand.com/userfiles/39089546908.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610600b2d0d19---43218723052.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/99517492661.pdfIn PDF document text
    • https://castilloexterior.org/ckfinder/userfiles/files/28919363566.pdfIn PDF document text
    • https://aventura-agence.lu/userfiles/files/47845105995.pdfIn PDF document text
    • https://losungversorger.com/product/file/bajewuromemakijumemu.pdfIn PDF document text
    • http://mathrainbow.com/userfiles/file/57023239050.pdfIn PDF document text
    • http://taxplus.in/images/contentimages/files/jezefosobobukowaxoroxetav.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b49c0601761---xezuzisedogaw.pdfIn PDF document text
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/zajokimorotis.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/24fca80110551d054fc701549259c5b3/25084107084.pdfIn PDF document text
    • https://ltanimalpark.com/wp-content/plugins/super-forms/uploads/php/files/d8bc5ba7633f9a9b89f4d9ba5dfdeb34/linanilatisebutipebiwe.pdfIn PDF document text
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/xanumozowutorukojopa.pdfIn PDF document text
    • https://scavilecis.it/userfiles/file/87206386436.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160929f30d504f---gekolepudibemunavawanid.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/16112fffdd4bdb---41610462519.pdfIn PDF document text
    • http://bnblspecialities.com/userfiles/files/67367268434.pdfIn PDF document text
    • http://pajurioverslas.lt/ckfinder/userfiles/files/derarumufib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=parisina+manualidades+leon+gtoPDF 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_off0000d7b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B5 19340 bytes
SHA-256: d6089efe6325cfde38d59a84eeb1e0d4966a3e3a3013281df63c2fdb1bf24fd1
font_01_sfnt_off00010b28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B28 10692 bytes
SHA-256: 77f40f8b1cfb2b8c8af4c3d0c105be304d1c7b1198f829143f109e892230cd7c
font_02_sfnt_off0001236a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1236A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1