Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dd743c740bc2f8d…

MALICIOUS

PDF

78.3 KB Created: 2021-09-16 02:29:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 80314d4767fe63565e45d3909d30a4be SHA-1: ff9fc773d3d43a7449ab4a4be258d7cc6c554539 SHA-256: 5dd743c740bc2f8d1d8b29d00c6b5d64248d451db7d5916d435e26ed1a421159
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains or compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of embedded JavaScript points to potential exploitation or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://pu-sk.com/app/templates/js/ckfinder/userfiles/files/15082854935.pdf In PDF document text
    • http://codienlanhminhquang.com/upload/files/79102054757.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161416dbb5c275---mewisub.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/56d7ef1f89bfb22542816d22ea439645/73348172884.pdfIn PDF document text
    • http://stigstudiotecnico.it/userfiles/files/jivuxesasafim.pdfIn PDF document text
    • http://www.mostenpo.jp/userfiles/files/larobagesedez.pdfIn PDF document text
    • http://evola.it/userfiles/files/votugebiliwawafikakumexew.pdfIn PDF document text
    • https://abzesolar.com/uploads/files/76161436097.pdfIn PDF document text
    • http://naso10.com/userData/board/file/65247835264.pdfIn PDF document text
    • http://shengyaweb.com/uploadfile/file/2021091010510411.pdfIn PDF document text
    • http://www.madiran-cruduparadis.fr/ckfinder/userfiles/files/totofezenuxefute.pdfIn PDF document text
    • http://backkwang.com/userData/board/file/musajazepigaritojipogoda.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/d3744368cec252dfa9848a06972f5bf2/86212826150.pdfIn PDF document text
    • http://parvazyab.net/basefile/api203/files/80013210041.pdfIn PDF document text
    • http://tnslib.tools/userfiles/files/lowemoboxe.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/fv72v8abugmkj3kdmegb14bl83/86813240440.pdfIn PDF document text
    • http://gccde.com/downloads/blog/geust/files/7216599656.pdfIn PDF document text
    • http://hangnhatbanonline.com/upload/files/23784337265.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/35934633181.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/tojadaxukaridejijufumeru.pdfIn PDF document text
    • https://www.abandassociates.com/ckfinder/userfiles/files/galixigawunesoxudap.pdfIn PDF document text
    • https://rarahil.org.np/ckfinder/userfiles/files/85442019932.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-9-13/20210913225403115797.pdfIn PDF document text
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/neserakobip.pdfIn PDF document text
    • https://szabobuszrendeles.hu/files/files/mobenadetirajep.pdfIn PDF document text
    • http://imosa.asia/uploads/files/202109011150569131.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=fake+notifications+apkPDF 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_off0000cba5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBA5 18424 bytes
SHA-256: bb77a04e51e4de7730a7c2f2c1fe1873b2a207a35236d44251b4b1837b0545f8
font_01_sfnt_off0000fbd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD9 10396 bytes
SHA-256: 7c1699967b9a40873bedb0ee4fbc3180e61161b7db8e4892fb8f4a19c2647ce9
font_02_sfnt_off0001138b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1138B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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