Malicious PDF — malware analysis report

Static analysis result for SHA-256 20fa048a35bbfe63…

MALICIOUS

PDF

85.4 KB Created: 2021-06-29 21:15:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 63f6be535718172a714c15115ad6fb5b SHA-1: 63b4f288eb50ae01cf559a9830c3b48e9af922eb SHA-256: 20fa048a35bbfe634ccaebd06292276af7cf0a8e3ab7539c1040502e062020ba
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The sample is identified as a malicious PDF by ClamAV and an ML classifier, exhibiting characteristics of a browser extension installation lure. It contains numerous links to external sites, many hosted on compromised WordPress installations, suggesting a phishing or malware distribution campaign. Although no scripts were explicitly extracted, the PDF structure and the nature of the lures indicate potential for JavaScript execution or exploitation to deliver a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://philabc.ru/uplcv?utm_term=by+the+beautiful+blue+danube PDF link annotation
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9f9c5d94b8d476223b8a1a919ece4336/jasejekibiso.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/68433738700.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/k6d948vttrqed85qblfhn62drv/detitukinar.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fdec256b32---laruru.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/433d5bf867cc2ffba134d843bd1f9893/kudetajabofuw.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bba8fb6425---65890738066.pdfIn PDF document text
    • http://infinity-pro.ru/userfiles/file/bidodiradam.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1608d5606e680a---93826460715.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bea1c33b1ad---gekuzatub.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/e55b96f7e67be89639174c8319699043/46112028784.pdfIn PDF document text
    • http://pension-erlkoenig.de/img/editor/file/18379436218.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb514e8bcbd---75007277782.pdfIn PDF document text
    • http://saokienviet.com/uploads/image/files/65032971303.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f09eeb0126---88145189227.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16082b73d4c330---vigurezigoje.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/0khlopjjmeghn0514s3sfao95g/bewupakekalero.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/19514964795.pdfIn PDF document text
    • http://fruitvita.com/files/files/64924800604.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1913b906a0---7929988738.pdfIn PDF document text
    • http://unicorn-furnitures.com/d/files/lumanizewikufesonanevevur.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8fb014d38---45033900411.pdfIn PDF document text
    • http://ridendo.cz/files/file/58757679136.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/a94a157e1f01ca501816af5c8119a49f/gigalipopubegosuno.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_off0000e901.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE901 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010118.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10118 10468 bytes
SHA-256: 5b0decec51720a538301c862a3113e7d454ba4fa4a62431defc97ef18a93ac01
font_02_sfnt_off000118ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118CA 17992 bytes
SHA-256: 5f5d09f11fb6a93529e5bf976b88c1d393aa19958f56479d9dbfae5ea7b4d835

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