Malicious PDF — malware analysis report

Static analysis result for SHA-256 8aa402e7ee930ff6…

MALICIOUS

PDF

73.6 KB Created: 2021-09-12 02:10:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8fa8a1f17e3d13ac5085f53e84510b63 SHA-1: 174844d2cbfb3d61b2e6392a93e242afbb5ebf40 SHA-256: 8aa402e7ee930ff651254df710518b4b41ea450e5dab09018569fdfb58703eb5
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to disposable hosting or compromised WordPress sites, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is a common method for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

Heuristics 8

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://synerhu.ru/uplcv?utm_term=android+vector+drawable+animation PDF link annotation
    • https://lotte-ppta.net/beta/assets/file/3977102393.pdfIn PDF document text
    • http://studiotecnicomartani.eu/userfiles/files/15656250770.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef7cd5f219---41753589165.pdfIn PDF document text
    • http://de.ruben.pl/ckfinder/userfiles/files/wizezumexuma.pdfIn PDF document text
    • http://sinproval.it/userfiles/files/ditotopabadawaz.pdfIn PDF document text
    • https://abouelhoulgroup.com/userfiles/files/rovopovamimepasap.pdfIn PDF document text
    • https://mygoaltv.com/ipp/images/uploads/files/mututizomujuzatekuvux.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/08bd5d475f2cb7b0818a83346d65c752/kimaravigogosegejazawoko.pdfIn PDF document text
    • https://globalcareerclub.com/FCKeditor/userfiles/file/guwimepufuzufasub.pdfIn PDF document text
    • http://yenidenyuzlendirme.com/ckfinder/userfiles/files/95756284688.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-9-11/20210911010504520031.pdfIn PDF document text
    • http://akekaluck.com/ckfinder/userfiles/files/vagoxat.pdfIn PDF document text
    • http://randygordonlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xujalegotogetu.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/dutebiri.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/pj5tjqke2ge3t6uqv5fbohlmk4/24839302660.pdfIn PDF document text
    • https://vitanov.rs/files/48985952833.pdfIn PDF document text
    • https://ka-base.no/images_students/files/kupuwimufedenemefokid.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/jowuboze.pdfIn PDF document text
    • https://buyafranchise.org/files/files/24666804542.pdfIn PDF document text
    • https://asiapharma.la/files/files/13509522204.pdfIn PDF document text
    • http://hotelpenza58.ru/ckfinder/userfiles/files/gifagadejijovarefulibez.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/66688640594.pdfIn PDF document text
    • https://linhngapt.vn/upload/files/vezulizaderizim.pdfIn PDF document text
    • https://trinityautorepairs.com/uploads/files/86330292040.pdfIn PDF document text
    • http://palazzodiaz.com/userfiles/files/99070866269.pdfIn PDF document text
    • https://uetty.xyz/js/ckfinder/userfiles/files/domir.pdfIn PDF document text
    • http://www.pes.edu.mn/ckfinder/userfiles/files/jesabasopaje.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_off0000bf8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d79d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD79D 15856 bytes
SHA-256: 0deaa60fd2bad8da3af1259d03a68d33e491532f1969b223ac514f2172ea158a
font_02_sfnt_off0001001b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1001B 10636 bytes
SHA-256: 5460eb0cb6d213ad59433b115e185aa98c15ad50bd1aef30a6522d6451882226