Malicious PDF — malware analysis report

Static analysis result for SHA-256 6002972cdd8cb555…

MALICIOUS

PDF

78.7 KB Created: 2021-09-08 01:24:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6bb877ec630b177a7d9304ce724a52a7 SHA-1: 5c0e9e32861f4f10c1b95796096bd9c090fcbf8d SHA-256: 6002972cdd8cb555b3a471d4387000783718e0f44f3610f7faac24aac07af58e
96 Risk Score

Malware Insights

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

The ML classifier strongly indicated maliciousness, supported by heuristics identifying the PDF as a link farm hosted on compromised WordPress sites and disposable domains. The document body is heavily obfuscated and unreadable, but the presence of numerous external URIs, many pointing to potentially compromised infrastructure, suggests a malicious intent to redirect users. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 5

  • 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://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608f025914c4d---vanabogiruku.pdf In PDF document text
    • https://ville-saintleonard.fr/pdf/denijabazodimuxinokerej.pdfIn PDF document text
    • http://visit-pune.com/userfiles/file/86167079363.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610efec1307ee---1804588354.pdfIn PDF document text
    • http://nattuvaartha.com/assets/ckfinder/core/connector/php/uploads/files/vomojopivajofavamusa.pdfIn PDF document text
    • http://cz-synergy.cz/data/file/11827821769.pdfIn PDF document text
    • http://www.drivingschool-brno.cz/files/files/35409540765.pdfIn PDF document text
    • http://maplewoodmachine.com/clients/1/17/17f0ea2532424b9b8bf99baf53cd3763/File/rawogalefikipovajatokuful.pdfIn PDF document text
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/53510316752.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609c999a0ab3b---votatonis.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160945ccbc0b3b---miruditetotazo.pdfIn PDF document text
    • https://prcomponents.com/ckfinder/userfiles/files/76520417115.pdfIn PDF document text
    • http://gloria-eurex.com/54062686624.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/wovepasuforukosono.pdfIn PDF document text
    • http://maekuangudomthara.com/ckfinder/userfiles/files/81142605476.pdfIn PDF document text
    • https://uleshuzataruhaz.hu/files/file/56393602675.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/vonosebilu.pdfIn PDF document text
    • https://dunaweb.co/bg_image/files/runapolatogibava.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/qv48sm9me8dbe3rk9ke6pmc9e4/7019755771.pdfIn PDF document text
    • https://best-label.com/upload/files/81800742232.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160bf0e89b650b---viwudariva.pdfIn PDF document text
    • http://inncredel.com/uploads/firexekon.pdfIn PDF document text
    • http://www.aluvascientific.com/UserFiles/file/93551517833.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=gnostic+luciferianism+pdfPDF link annotation
    • 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_off0000cf09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF09 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e720.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE720 10920 bytes
SHA-256: f5beab5d8791f6732e1d96a11188fa7b259a22364cb1bc901c03c345aebb30c3
font_02_sfnt_off0001006d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1006D 17640 bytes
SHA-256: 8591381c3c285be0102a2e36d6b1da059ccbfef1a1022792e4b12882cf3a7e96