Malicious PDF — malware analysis report

Static analysis result for SHA-256 631a129ff2777259…

MALICIOUS

PDF

87.8 KB Created: 2021-08-05 00:31:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 82475c7e807f44722741b3719baef710 SHA-1: b982165d90c76aba7d28adccd012d0605c13ce62 SHA-256: 631a129ff277725959c16c9adeebd0353b69c1b7117c2ca50ca2808b78b8ddb3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely responsible for initiating the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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 http://jtour.vn/userfiles/file/piwaxadamegivemet.pdf
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e77ca324094---logerobazisapezi.pdf
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/387c3c7bed4cd21943e3e8e157b80166/4985748066.pdf
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16074ffa5ab128---96363904415.pdf
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/varewiboxomevisakorez.pdf
    • http://highendschmiede.de/highendfiles/file/94930649946.pdf
    • https://advance-pack.com/editor_upload/file/fapaxiwemuta.pdf
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/4mvdoehui1h7uk9phu9nk5ih67/12924746734.pdf
    • http://xn----itbbfrdrdbd4bgy6gi.xn--p1ai/webroot/files/files/61044422577.pdf
    • http://to-kajihan.net/js/upload/files/ditasarevo.pdf
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b27f3f0e444---dapeter.pdf
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610a4affe24b5---80747387455.pdf
    • https://annjulieskarpmo.com/userfiles/file/kimalufozemurifizoxilaxo.pdf
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/64504f05cccb53b6985ec4ebb86b51dc/juzosinozizapiwefevalil.pdf
    • https://resonanceacteurs.nl/userfiles/file/jinikofetekuriwamawoturu.pdf
    • http://movietek.vn/hinh-anh/files/molowufekobarimije.pdf
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f95cec756f9---79628311020.pdf
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/qq12hc6pijsj4ptn5frg0bi92a/64763608255.pdf
    • http://dmscsmartlifeblog.com/userfiles/files/42415693677.pdf
    • http://qlinairnv.be/userfiles/file/libivanowawuz.pdf
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075bace92036---46233690589.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=jack+the+giant+slayer+movie+in+hindi+dubbed+watch+online
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0c6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C6 16792 bytes
font_01_sfnt_off000108dd.bin
04cb8cc7d9b32d4d12f594c470d09f9223e1acca412afdab5d2cc3966d925791
pdf-font-stream PDF embedded font (sfnt) at offset 0x108DD 11404 bytes
font_02_sfnt_off00012382.bin
802793127d58b91fc2e044ccf64984c24da9082732c6c2dee2c37b71fa526259
pdf-font-stream PDF embedded font (sfnt) at offset 0x12382 17596 bytes