Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfc865d8fed6e859…

MALICIOUS

PDF

192.8 KB Created: 2021-09-04 18:19:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6b1be00a682856c4158b51f953865147 SHA-1: a6ab707611fd210b46d51a8dea3d8064cedcdd3b SHA-256: dfc865d8fed6e859545804b431a132217b724a0e65d24f31da8abb57d158b841
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to numerous URLs, many hosted on compromised WordPress sites, suggesting an attempt to distribute malware or conduct phishing. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 6

  • 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://zulaikhatextile.com/userfiles/files/panevoledut.pdf In PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160831f8553b58---jezujapugabumulokofa.pdfIn PDF document text
    • http://emons-verlag.net/testarea/cwsCMSlight/media/files/38590880287.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/68fa860aa37f5cb74afbfa5625a6057b/madeseletez.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/135974c2fb06818564a8f3f9ddbf89df/95291121539.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/76e259b5ccd260ea553e8103169551c3/82355220087.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/68e8a9afce150d5bdad47e7e63317d88/51730390023.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/navitaviwu.pdfIn PDF document text
    • http://www.ville-civaux.fr/admin/js/ckfinder/userfiles/files/36359738457.pdfIn PDF document text
    • http://ticaproduce.com/ckfinder/userfiles/files/poxokororizefuxojujusasej.pdfIn PDF document text
    • http://orosweb.hu/userfiles/file/54899228173.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/bpdkvsnp4qdhn46v52keigq3m0/90873655022.pdfIn PDF document text
    • http://aliguoriarchitetto.eu/userfiles/files/32466348659.pdfIn PDF document text
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/93192137444.pdfIn PDF document text
    • http://mastera-mix.ru/ckfinder/userfiles/files/fukole.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160f29f54cf873---ruwunib.pdfIn PDF document text
    • http://suphammamnon.org/uploads/files/gexikowalipam.pdfIn PDF document text
    • http://www.como-grup.ro/fisiere/file/zariruzededamiv.pdfIn PDF document text
    • http://studionegrelli.it/userfiles/files/terepisamuzudukup.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/4c693da214f4a3c49dcc63c171b1eeb0/lanizarokedovuvemejewow.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/pejenovojedepimex.pdfIn PDF document text
    • http://backyardreleaf.ca/clients/6/6a/6a4eaaf8452764cb6fc14c9064ed0c71/File/suwasik.pdfIn PDF document text
    • https://ensegun2.com/ckfinder/userfiles/files/97437816729.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/60561882329.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=plan+kont+jednostek+bud%C5%BCetowych+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_off000292ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x292ED 11296 bytes
SHA-256: 3abab5fe9c6ea115ba6d22d938b3b68fec0cf0bcceba169bf97608ec2d4dc27a
font_01_sfnt_off0002ad68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2AD68 17932 bytes
SHA-256: 1633ff4450bdbbbcd8eac921e6c99b9ca9249c41f717e48e1733c1d48039477b
font_02_sfnt_off0002da88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2DA88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1