Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f5b29a4dd09662b…

MALICIOUS

PDF

68.6 KB Created: 2021-09-25 17:15:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7a39de2e6d8247db217e4677283165c9 SHA-1: 9793f29ea88ae9b6f4084c2e26a0e77be40e19a8 SHA-256: 8f5b29a4dd09662b10e1dc6b97ff55b98dc5ff244ad4dcb10ca4659ad6dbb589
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its small size and image-only content, typical of a screenshot designed to hide clickable elements. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm used to distribute malicious content or redirect users. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate malicious intent, likely to lead users to a phishing page or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132ca687a799---65139714122.pdf
    • http://zeroseistudio.eu/userfiles/files/kefunukowuwumudezubaso.pdf
    • https://autonoleggioassereto.com/file/mimogufefag.pdf
    • https://cincia.ro/ckfinder/userfiles/files/82715065899.pdf
    • http://labsshop.com/d/files/71243529206.pdf
    • https://pezenasenchantee.fr/userfiles/file/matodigajiba.pdf
    • https://www.mnogotrop.com/ckfinder/userfiles/files/49849807848.pdf
    • https://audreyheselmans.com/_files/file/puduwotaber.pdf
    • http://rassadaspb.com/new/files/file/20992759119.pdf
    • http://halongbaycruises.org/upload/files/businewi.pdf
    • https://mimpidia2.com/contents/files/ditemog.pdf
    • http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/48969917368.pdf
    • http://tungalag.mn/userfiles/files/zutix.pdf
    • http://pol2-simf.ru/userfiles/file/5123383287.pdf
    • http://toanthinh.vn/webroot/img/files/xunajere.pdf
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143a9a1a6cba---wetixutisazafawepagul.pdf
    • http://iehyun.com/editorupload/file/pezew.pdf
    • http://libron.pl/fckupload/assets/file/48018835888.pdf
    • http://ippinnudon.com/uploads/files/fovopanelowozezujutere.pdf
    • http://wakesup.org/userfiles/file/28741826729.pdf
    • http://psn-monolit.ru/img_file/files/kirozelalatogis.pdf
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/bb02c72599055f9fc4bb8139872305ea/bazikepibedokodomepajoji.pdf
    • https://vientangluc.com/upload/files/5424853081.pdf
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143d96578edd---39394244182.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=manglish+keyboard+apk+for+pc
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000aeaa.bin
f33ab86acca11b15ffd3e13e0d5c07efd422b4e6ab650ca224e14884f125b9a8
pdf-font-stream PDF embedded font (sfnt) at offset 0xAEAA 11140 bytes
font_01_sfnt_off0000c82b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC82B 16792 bytes
font_02_sfnt_off0000e03d.bin
16fa7d08875a77a65210d33b7c328d75a81441e02a218412b25cf19dfb5457ff
pdf-font-stream PDF embedded font (sfnt) at offset 0xE03D 14152 bytes