Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb996e38aed72d56…

MALICIOUS

PDF

98.0 KB Created: 2021-09-09 18:05:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 23c5ee60773e78b41e1ab9d1598343d7 SHA-1: 7cb5f81efdf1d55fc0188927eb64282bd65210f6 SHA-256: eb996e38aed72d5620fd5a05d2045162f0a3d1d63e54f9fa378a6ee650925a9c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload storage or disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted from this sample, but the presence of multiple external links and the overall heuristic profile points towards a phishing or downloader attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://crysiq.ru/uplcv?utm_term=lone+wolf+android PDF link annotation
    • http://abbeloosschinkels.be/userfiles/file/fazenuvutazubemufedodu.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136b6a73f68b---sazebikevi.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/duzitogakake.pdfIn PDF document text
    • https://skatrip.com/basefile/skatripcom/files/26691660748.pdfIn PDF document text
    • http://aallergy.netlovestories.com/upload/files/gamamedorodijewesewev.pdfIn PDF document text
    • http://dienlanhhuubinh.com/upload/files/suzapada.pdfIn PDF document text
    • https://iphone-odklep.si/vsebina/jukedorutekedulo.pdfIn PDF document text
    • http://mrcubezpieczenia.pl/app/webroot/media/files/gejixixamenavorakinaseb.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/16138f1c2b7200---resazivigataz.pdfIn PDF document text
    • http://sdv.sk/userfiles/articles/file/dewazikin.pdfIn PDF document text
    • https://cometgroupinternational.com/ckeditor/ckfinder/userfiles/files/siwuwekozolilovaga.pdfIn PDF document text
    • https://aneri12.eu/res/file/vofapewubivozajile.pdfIn PDF document text
    • http://truhlarstvisollner.cz/data/file/rokus.pdfIn PDF document text
    • http://emke.hu/uploads/ckfinder/userfiles/files/5660237091.pdfIn PDF document text
    • http://erisalaw-chicago.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/23325836572.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613593dc08ecb---meworuxawopotopomawane.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/tukurajumipew.pdfIn PDF document text
    • http://studiolorenzino.eu/userfiles/files/luvomer.pdfIn PDF document text
    • http://qbcar.ru/ckfinder/userfiles/files/tajuguji.pdfIn PDF document text
    • http://xn--80aguejfegacgj0ad.xn--p1ai/pict/file/gomewugelutufomeledi.pdfIn PDF document text
    • https://tgvl.in/uploads/fck/files/82990711843.pdfIn PDF document text
    • https://culturasiapamplona.com/guiarte_userfiles/files/99930896741.pdfIn PDF document text
    • 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_off00011ad4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AD4 10124 bytes
SHA-256: b459194516b1754f61be40ddf5c4cf8fae639006391beb11b5117b389e1998ca
font_01_sfnt_off00013184.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13184 18608 bytes
SHA-256: 8d739d822374c99b2297dbb6e6f62428e3fe8e66cfd1c54599f701bb6ee6361f
font_02_sfnt_off000162a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x162A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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