Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d16aa6c9daa7e36…

MALICIOUS

PDF

79.1 KB Created: 2021-09-05 23:45:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: bcb500cd9f8baea5d3ef61424be70635 SHA-1: d44cae1c865de93d8b3c860ee983a1034fe9083e SHA-256: 5d16aa6c9daa7e364c2b027f0931085103842fdc677167453d90913f3365fd41
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for executing malicious code within PDFs.

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://catamma.ru/uplcv?utm_term=exercices+articles+definis+indefinis+pdf PDF link annotation
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080a717ce6e4---jiwafifomo.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160745959a8f38---litode.pdfIn PDF document text
    • https://siroyensao.com/upload/files/vuziruzexijigodono.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/a48auin30c1vjd0s32cat1onoo/zipaxuxip.pdfIn PDF document text
    • https://imahima.xyz/js/ckfinder/userfiles/files/mikipaferetebes.pdfIn PDF document text
    • http://hoteldarim.ir/basefile/hoteldarimir/files/nodagadatodux.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/f1b09f75a88a837cda2870be605a449b/gidirufonelijosixapu.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/13129443857.pdfIn PDF document text
    • http://maxtarget.by/ckfinder/userfiles/files/52592471375.pdfIn PDF document text
    • https://thinkhigh-tech.com/d/files/fidasaz.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/48024258064.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/45f3ea5dee4aae984e0fcc4d98011e06/20234594021.pdfIn PDF document text
    • https://robert-zauer.cz/userfiles/file/24459885926.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/fc56cc54d5247e1856fc3be9a8da1363/sexotipe.pdfIn PDF document text
    • https://porterbrothersltd.com/app/webroot/uploads/pegidabasefarixapijiloka.pdfIn PDF document text
    • https://fibaquitaine.fr/cebatrama/userfiles/files/28686851362.pdfIn PDF document text
    • https://kamarkosong.com/contents//files/18539347607.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/bozavepev.pdfIn PDF document text
    • https://muahohangnhat.com/app/webroot/uploads/files/66853055507.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee41dd9b58b---31799601323.pdfIn PDF document text
    • https://anup.bo/images/files/29956475786.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/667f785c937c74c72443f9874f45239f/91039840759.pdfIn PDF document text
    • http://ongnuocdenhat.com/upload/files/zixir.pdfIn PDF document text
    • https://yasacompany.com/upload/files/dipofulewarakilozaxuw.pdfIn PDF document text
    • http://www.pvvc.cz/files/4736284756.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/88540239695.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_off0000cb31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB31 19820 bytes
SHA-256: 997da466cb7374d0e64d150018a4001b8c4de8ed654bb98ac26c26919bced302
font_01_sfnt_off0000fdd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD0 10580 bytes
SHA-256: 84f2fe6ad6742b010ae5db36bfe915b41fae6b26a489b266b4b2aec076785527
font_02_sfnt_off00011612.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11612 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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