Malicious PDF — malware analysis report

Static analysis result for SHA-256 35a855c149d08644…

MALICIOUS

PDF

82.7 KB Created: 2021-09-15 14:59:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bd1ea87e5dca853bfc038face757c227 SHA-1: f1aadb87ec47ff6c70cafc90799f284bb24ec7aa SHA-256: 35a855c149d08644ce6a1334cb0b4cbd536a2fdfcfc78233ecc96505c7f2e9aa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • 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.
  • 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://synerhu.ru/uplcv?utm_term=todoroki+live+wallpaper+pc
    • https://dunakanyarfesto.hu/ckfinder/userfiles/files/munijoneniminerojozirad.pdf
    • http://www.shjkyq.com/up_files/FCK/file/jevixuk.pdf
    • http://ylphs.com/ckfinder/userfiles/files/55063550074.pdf
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/edaf2c2188183739cbcd28984ae2501f/22255957397.pdf
    • http://www.polni.si/Images/files/jerikopuku.pdf
    • http://studio-rivetti.it/userfiles/files/18928598941.pdf
    • http://rhondachem.com/d/files/85051834916.pdf
    • http://studiospazioambiente.it/userfiles/files/32836905193.pdf
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/92d1407c108c153b3bf81b3085f6c357/rafepola.pdf
    • http://vladjurnalist.ru/archive/file/55365961092.pdf
    • http://mottaing.eu/userfiles/files/jugawije.pdf
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff0ac31aa5---lelatinalavena.pdf
    • http://spy-military-labs.com/userfiles/file/43723590347.pdf
    • http://sluchatka-shop.cz/files/upload/files/32489359324.pdf
    • https://keluargamimpi2.com/contents/files/93441321558.pdf
    • http://lightningriskassessment.com/ci/userfiles/files/betaguzo.pdf
    • https://tsydesign.com/userfiles/jws/files/12027638889.pdf
    • http://zhfangyuan.com/uploadfiles/files/sinelonela.pdf
    • https://leuphuotcamap.com/uploads/image/files/viwixazununajole.pdf
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16139774f5d321---63258655389.pdf
    • http://thuduchouse.vn/pics/file/bipidafodova.pdf
    • http://feynburg-uhren.de/uploads/mudokugeropi.pdf
    • 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_off0000dc21.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC21 16792 bytes
font_01_sfnt_off0000f438.bin
f40fe1f6d93b3bab75e1de202aabcc439c6ea6a3b034b1664e3f76331bd778e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF438 10344 bytes
font_02_sfnt_off00010bae.bin
7c9eeaa33cca2a5206fc92b4eb20e2c4d70c84e2c8008d173f01921371655210		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10BAE 18888 bytes

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