Malicious PDF — malware analysis report

Static analysis result for SHA-256 b27f6c6c5b04b2ba…

MALICIOUS

PDF

82.3 KB Created: 2021-09-21 00:53:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: cc8ae5a66a72dfbaa512e05feea44a69 SHA-1: 1d2ec0a6d490abc7767fa01fc1ec5f9ffa3c2b62 SHA-256: b27f6c6c5b04b2bae8e54c8f1c2aa62daa58ed146f3e0a48cdad6bfcbd6cf321
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites via these links. The embedded JavaScript may be used to further obfuscate the redirection or initiate a download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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.
  • 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://inwebjor.ru/uplcv?utm_term=web+development+or+android+development PDF link annotation
    • http://logopeda-empatia.pl/content/file/43005874584.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/934454bf0fde3197c205abaab833d3cc/63203739099.pdfIn PDF document text
    • https://k85shj16h-561lt.com/contents/files/87269705195.pdfIn PDF document text
    • http://www.dkmodels.net/ckfinder/userfiles/files/tusefeminifibi.pdfIn PDF document text
    • http://dalaichau.com/files/lutivoma.pdfIn PDF document text
    • http://eia-edu.com/userfiles/file/62981054464.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614828f20843a---lulinapelobana.pdfIn PDF document text
    • http://rklatex.com/userfiles/file/dekiwesu.pdfIn PDF document text
    • http://rootbeadmill.com/upload_fck/file/2021-9-19/20210919060941823075.pdfIn PDF document text
    • http://sensi-leszno.pl/userfiles/file/sekibumegamowadire.pdfIn PDF document text
    • http://tumakuruvoice.com/tumkurvoice/ckeditor/ckfinder/userfiles/files/gikisudinumudaxosu.pdfIn PDF document text
    • http://smartwealthhk.com/userfiles/nazaxixaririz.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-09-05/images/files/genaladimuzixujorubir.pdfIn PDF document text
    • http://isystem.hu/userfiles/file/78150324726.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/atl09h52olpficcvb6l6vgmu21/kuxanaruremurunujiwi.pdfIn PDF document text
    • http://dspec-car.com/js/upload/files/80477011468.pdfIn PDF document text
    • http://gyarmatilovastorna.hu/userfiles/file/72400986897.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144b95a23b84---juxumifamujete.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/uql1iv9bkli6e9jc4023noa376/90105986696.pdfIn PDF document text
    • https://netcsemege.elelmiszer-hazhozszallitas.hu/ckfinder/userfiles/files/difazazudavuxu.pdfIn PDF document text
    • http://megaprestige.ru/uploads/files/36347691976.pdfIn PDF document text
    • https://www.rt9.rspo.org/ckfinder/userfiles/files/61437320967.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_off0000ded7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6EE 10584 bytes
SHA-256: 70ff7285ae037ccb090d3f21a0fb3588c91b4704795d6fe9a32f9743056caba4
font_02_sfnt_off00010eca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ECA 17156 bytes
SHA-256: f0e6610ea87f98818ad51dc73cc4ced275442f79089467f979a90bee8c351e2b

Open this report in the interactive analyzer, or submit your own file for analysis.