Malicious PDF — malware analysis report

Static analysis result for SHA-256 619b3d28bcbed703…

MALICIOUS

PDF

82.1 KB Created: 2021-09-05 06:06:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ddad288e56accae20ad6c89cde60941f SHA-1: eaea2c2645924e8f25891e970ac0c95aa6e22f3f SHA-256: 619b3d28bcbed7033f8a1f9022df1e2a056bfb838e1c497849bf53c86297fc69
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and a significant number of external links, many pointing to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 https://nomylo.ru/uplcv?utm_term=2018+jeep+wrangler+unlimited+sport+owners+manual PDF link annotation
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a6905134f72---babomodemukuzitasofilu.pdfIn PDF document text
    • http://greenld.com/userfiles/rifazekobarekozefuzusur.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/86806b2764bd8a5a00fd63e0ecf78f20/taneji.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0846bfd1c---xixedekitodabarureseriko.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/pg5hf9f95ar6hkcoaeo475amk7/gexezuvorexedebonisokowoz.pdfIn PDF document text
    • http://celcg.pl/uploaded/file/36108994293.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161132ae7dc9a2---65488649561.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/ziwefuworagobub.pdfIn PDF document text
    • https://minervatech.work/js/ckfinder/userfiles/files/81325217614.pdfIn PDF document text
    • http://balone.net/_upload/file///gisixakenigemabufaguref.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608b5b2fa7193---46632416072.pdfIn PDF document text
    • http://kosmonautika.ee/ckfinder/userfiles/files/tufukaravaxuforexuvupu.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/35e31bedab3926f1c900340daf8ae7b6/rorukasidaxefodelixufos.pdfIn PDF document text
    • http://rencontres-icare.org/userfiles/file/79223592552.pdfIn PDF document text
    • http://studiotecnicomancini.eu/userfiles/files/43798631396.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/nulukixigijusidofekinoxu.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dba656e9782---12621076602.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/o99gn65lh7j3l3c55l2plis711/dedixukuxex.pdfIn PDF document text
    • http://beiks.info/public/file/58101896263.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/49f698de853eb31399d1fe9b7843d1d4/55737440935.pdfIn PDF document text
    • https://rugsinc.in/UserFiles/files/siwinuluboxebotere.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078c9cc2a52a---48099890329.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608a10d25c79b---97273598110.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a802106091b---21290453682.pdfIn PDF document text
    • http://autoscuolavalerio.it/userfiles/files/xizeresirawo.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/bf5045416d5230cc27c327f791a38ed9/57003259574.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_off0000da54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA54 11456 bytes
SHA-256: 3f600b2f2caf53a44281e2059c20fa5955e9058896452f53da08dc2e84b128fc
font_01_sfnt_off0000f549.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF549 17288 bytes
SHA-256: 1317f31b355cbfd26762ed67b72a36882a55746dc82fde17ac7830fa7d105f3c
font_02_sfnt_off000121cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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