Malicious PDF — malware analysis report

Static analysis result for SHA-256 acd9272ff1dbe3c0…

MALICIOUS

PDF

160.1 KB Created: 2021-06-28 22:46:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c284aa193c94c91779c06608523bd609 SHA-1: 56269e7871741c8f5caf05ee4f26379ddd549e64 SHA-256: acd9272ff1dbe3c0c646b96063fa88627c10beeeb11ea365a673b216a65d983e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm with numerous URLs pointing to potentially compromised websites, indicated by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the presence of many external links is the primary indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9903

Heuristics 6

  • 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.
  • 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://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/abf7030047affb29cd90831d9db2c61e/51917958151.pdf
    • http://robalton.es/Albums/images/file///jikodewovifegiporo.pdf
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/ugua3eta2c563mk3kihrajenkd/50944744388.pdf
    • http://www.deopendeur.org/imgUser/file/pavusu.pdf
    • https://campermagazine.tv/public/file/tukuvalowawemetimunu.pdf
    • http://skonasystems.com/userfiles/file/2280673214.pdf
    • https://xn--faades-mtal-n9a6a.ch/ckfinder/userfiles/files/fosanu.pdf
    • http://rollfactorytogo.com/uploads/files/49996637500.pdf
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/4a8528c2f7f34515af1b37a332faa207/rokeditavewujirewonalulos.pdf
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608431b4cbd21---didazufazategovodatetogis.pdf
    • http://goldmustang.com/files/files/tojodawidubiv.pdf
    • http://littlepearlspublishing.in/data/eimages/file/34270678179.pdf
    • https://mattress-leader.com/media/44825955157.pdf
    • http://planetamama.ru/files/file/8301154056.pdf
    • https://cambodiaangkorhomestay.com/userfiles/file/jetaseravujite.pdf
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/7f5e135ef973f88fb9ed458023724661/legikapi.pdf
    • https://dagvandearchitectuur.be/_files/file/firanuposesudodom.pdf
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da1f8d63056---tuwadexababupememipatol.pdf
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cccbfea4a50---gefexuxodejow.pdf
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/0e7700bb2003ddb616fa3ae5826366ef/13498758252.pdf
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d89fd5f1cd3---72555995213.pdf
    • https://jokerprod.net/userfiles/file/vimote.pdf
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/d9054064f011382fb8f5d6a525d45662/39679147380.pdf
    • https://an-professional.ru/img/files/file/54589275087.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=west+and+east+egg+great+gatsby
    • 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_off00021309.bin
19130cc208f5729d31d02cbe0edbef05982cdc7e0fb4e938f6064e40f4daae88
pdf-font-stream PDF embedded font (sfnt) at offset 0x21309 10412 bytes
font_01_sfnt_off00022a98.bin
300ab219e9e05c462cf5fa8442670b06242380e966115bc0d3bd64e2b9cd8ca0
pdf-font-stream PDF embedded font (sfnt) at offset 0x22A98 17948 bytes
font_02_sfnt_off000258f8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x258F8 16792 bytes