Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0b5661b34562841…

MALICIOUS

PDF

76.9 KB Created: 2021-09-03 23:46:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9638d8bedc77fb923380fdbda87db251 SHA-1: eb29c54ba95bf2ed24a90e6e807b909c10bde607 SHA-256: a0b5661b34562841b18d5301b9284a611485f68ddefcadd22c6873ee49c62890
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The primary attack pattern involves luring users through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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.
  • 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://synerhu.ru/uplcv?utm_term=rog+maximus+xi+hero+wifi+manual PDF link annotation
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16071d38998f7d---xotonetunidajaferaxov.pdfIn PDF document text
    • http://panyuchen.com/ckfinder/userfiles/site_eachfun_com/files/37195095142.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/e37f68c84bf0464f963f2fb02a380714/sarozolasatiwi.pdfIn PDF document text
    • http://paulabenveniste.com/UserFiles/file/tebinubupivosepivurodog.pdfIn PDF document text
    • https://portugaliaimagyarok.com/ckfinder/userfiles/files/nadubuwipu.pdfIn PDF document text
    • http://maybaobidinhdinh.com/upload/files/vozebaraporek.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/1691958173f7aef8fd07b30831553ed6/kikuwuvasebujizowezumo.pdfIn PDF document text
    • http://j1medical.com/uploaded/file/47773421477.pdfIn PDF document text
    • https://whiteplacard.com/UserFiles/file/pazejevijikiniwopef.pdfIn PDF document text
    • https://giga-tronics.com/userfiles/files/liwasuxobakori.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160b3f4c197aab---livezaronifarob.pdfIn PDF document text
    • http://vrtaspol.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/wafexiwa.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a1be461ec36---woxumetemifaseviviweroriw.pdfIn PDF document text
    • http://daedukgs.com/admin/fckeditor/data/file/20210831080919.pdfIn PDF document text
    • https://www.theknowledgeonline.com/files/lib/ckfinder/userfiles/files/27374269347.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b309bcec91---56885273210.pdfIn PDF document text
    • http://akcompany.vn/uploads/userfiles/file/28794905788.pdfIn PDF document text
    • http://dataction.org/demo/dataction/media/88200267588.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad2329b426a---71060288597.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a8cb50a0819---xugasigavej.pdfIn PDF document text
    • http://vaynhe.com/upload/files/4462928886.pdfIn PDF document text
    • https://happycolaborativo.com/uploads/files/tanebararom.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_off0000c2a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2A8 19368 bytes
SHA-256: 6ce0005900d634b0209bba318909d320165a3bc9f4c4d691bf95d013e2188154
font_01_sfnt_off0000f486.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF486 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C9D 10896 bytes
SHA-256: 758fbefacc551faecb7882f48f618040bac95ff120c22254c42d75b21b319dea

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