Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cce0b5cf2974dbd…

MALICIOUS

PDF

88.4 KB Created: 2021-10-19 07:10:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 03e9515574dbe9dc2d25d51003d9db0d SHA-1: c7335877e5f050be0048df3361e0d1cd6530bdfa SHA-256: 3cce0b5cf2974dbdb366c8eb01a806dbfecdc2f9d6fbb7fa761251a4cac48129
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript and a large number of external URIs, many of which point to compromised websites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious URLs, which are designed to deceive users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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
  • 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://archism.ru/uplcv?utm_term=how+to+use+huawei+fitness+watch PDF link annotation
    • https://laurallo.com/ckfinder/userfiles/files/sodoxoxita.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1616cefab10e4c---zijufawiwogafuwif.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/ocima78i1tg00525r3k2681k4o/7943559689.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/161638b0875b71---25718942946.pdfIn PDF document text
    • http://ocean-ex.com/images/blog/file/pepalulobamaboxe.pdfIn PDF document text
    • https://baoyi-chuck.com/ckfinder/userfiles/files/69534805794.pdfIn PDF document text
    • http://dongshengcable.com/images/upload/File/rodufus.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/hvmqse4figf22o460aikusf6n3/89359013814.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/18988857484.pdfIn PDF document text
    • https://studioconcept-stand.com/fck_userfiles/file/4019095002.pdfIn PDF document text
    • https://harteron.ee/userfiles/file/zodukafebavejupipasokil.pdfIn PDF document text
    • http://master-stroi76.ru/userfiles/file/robedoxudesiwisowefaj.pdfIn PDF document text
    • http://xn--9i1b14l32gg2dsybq3b.com/upload/fckeditor/file/6239495991.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/e4cc6ea8f0f48926d7bb2c1edfe96196/45562460630.pdfIn PDF document text
    • https://arrayamed.com/userfiles/file/kolufewimivujelidezug.pdfIn PDF document text
    • http://viacaosaopedro.com/www/js/ckfinder/userfiles/files/67412416108.pdfIn PDF document text
    • https://sportuna.be/ckfinder/userfiles/files/sidiwabesalazufa.pdfIn PDF document text
    • http://infypos.cncmonitors.com/infyposcms/media/kugurugarisirenemem.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/vojim.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c1e79574e6---28851172893.pdfIn PDF document text
    • http://pitchdecor-construction.com/user_img/files/papafotisinotiva.pdfIn PDF document text
    • https://odlingfamily.com/userfiles/file/43326948607.pdfIn PDF document text
    • http://yogo110.com/userfiles/file/98959760489.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_off0000f264.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF264 19360 bytes
SHA-256: 5f7b3f5682cf2df43c8ebcd9ab0d628123320f3640904e00bb1acf252a83ad51
font_01_sfnt_off000123cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123CF 10464 bytes
SHA-256: b7b991a00d9965b6966e459d33ba58b2dee1e4476829efefc6000d85da97e020
font_02_sfnt_off00013b9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1