Malicious PDF — malware analysis report

Static analysis result for SHA-256 a52d2d193a58374a…

MALICIOUS

PDF

60.9 KB Created: 2021-09-01 09:09:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 7127baf34a457c98a027eb97df42c960 SHA-1: a6ff0e2e9e00f0e0fa6ad57e31acf3a4ba871392 SHA-256: a52d2d193a58374ab9b0dfe77d3f015155cd0a6aa97d49bce904452403770549
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan. It contains embedded JavaScript and a significant number of external URIs, many of which point to compromised CMS uploads or are part of a link farm hosted on disposable domains. These elements suggest the PDF is intended to redirect users to malicious websites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7965

Heuristics 6

  • 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
  • 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://drafthe.ru/uplcv?utm_term=annual+maintenance+contract+format+for+cctv PDF link annotation
    • http://phongthuyphatloc.com/luutru/files/xexekozopozopodojijila.pdfIn PDF document text
    • http://interfacetravels.com/app/webroot/js/ckfinder/userfiles/files/kugama.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160cc1c6d72318---47166086624.pdfIn PDF document text
    • http://gewoongroen.eu/app/webroot/files/userfiles/files/mukabiwudik.pdfIn PDF document text
    • http://www.texaco.bargiel.com.pl/ckfinder/userfiles/files/31492944832.pdfIn PDF document text
    • http://dworbieland.pl/userfiles/file/digujut.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c11b4929a78---xevepafuzonujaboxinot.pdfIn PDF document text
    • http://studiomarcheluzzo.it/userfiles/files/morurodir.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c69c130eed0---55564523560.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/fnij4irmf8gi6klt70579v3nk1/59123082606.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f4dc7f27ac---gavedijogado.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/f8m1horqdvlk9j5asvvooa7cf1/61825466711.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/ogato.pdfIn PDF document text
    • http://abwpetersburg.com/uploads/files/rebavamanafixuwas.pdfIn PDF document text
    • http://heldermusic.nl/ckfinder/userfiles/files/dazape.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/rezifumonewamowifozos.pdfIn PDF document text
    • http://zakuskymoser.cz/www/ckfinder/userfiles/files/15329286396.pdfIn PDF document text
    • http://goref.ru/files/file/66065443043.pdfIn PDF document text
    • http://chinalabware.es/d/files/69617814973.pdfIn PDF document text
    • http://anthonyellisonfamilyreunion.com/clients/f/ff/ff850d76676c1858bf5e443b7a907d3b/File/81014055027.pdfIn PDF document text
    • http://plnjl.com/userfiles/files/kujotuxiba.pdfIn PDF document text
    • http://ghibms.com/userfiles/files/6718435264.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bb88cc9b012---worigokosopiwawuke.pdfIn PDF document text
    • https://pui-vital.ro/msg_media/file/numetonekulor.pdfIn PDF document text
    • http://ghgunclub.com/clients/f/f3/f3036db30fa8ed97f94f648fc77c1040/File/77062504180.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c3df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3DF 10476 bytes
SHA-256: a3686b05630ee9935c3723cc973436eb9f2733eb3659e14dc9aaa675775be5fe
font_01_sfnt_off0000dbb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1