Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef818a73d9a65bea…

MALICIOUS

PDF

94.8 KB Created: 2021-08-09 23:06:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: a9c857051707a32bc601b01cce28eedf SHA-1: 0c2c4c1ebd15f3c798f318c79ba61e5b4bd11f89 SHA-256: ef818a73d9a65bea21a33a40e634240ec5c3d2e50123dabb1e60103981cf91ef
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to lead users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://jagamimpi.com/contents//files/51529405431.pdf In PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/986a4933b740734fe3cb1df34eb0e9ca/28702656844.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160f05ac3e3c03---dokejuzi.pdfIn PDF document text
    • http://wagnerpc.com/userfiles/files/zibikupewisometiton.pdfIn PDF document text
    • http://thanuyentea.com/ckfinder/userfiles/files/gakejedutazetuzosudubim.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/ghcme84jnl8l5gpk0n3k400a24/rikefarimabadafumel.pdfIn PDF document text
    • http://prosquash.by/data/22026839352.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16104748568f40---xaranibedadetiwipeduvoful.pdfIn PDF document text
    • https://nidi.mk/ckfinder/userfiles/files/6970096428.pdfIn PDF document text
    • http://metafelix.it/userfiles/files/83244445403.pdfIn PDF document text
    • http://dorrstrechy.cz/UserFiles/File/sakogozixum.pdfIn PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/tebowavubamibisolosuw.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1609e9fe78c633---42095283737.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094c7ff5a5db---jetofus.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/4332ef7c3741eab50c45420e4a9aea78/51397383456.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/4cgu9jl51696bcq0qhfom8ioo7/38458794139.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/1k1suoqjodiv4pvnbup1ebkeq1/takuza.pdfIn PDF document text
    • http://www.pics4us.de/userfiles/file/volabowitesus.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/runimapuw.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/49970364364.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d61b9aca67---55580509534.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a44149e9494---28807423709.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085b48339072---94294154684.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=2021+harley+davidson+electra+glide+standard+accessoriesPDF link annotation
    • 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_off00010806.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10806 18672 bytes
SHA-256: 5e518b9e111d47a328029cc453dae7a9253ca624cc13d4b75c5abf8fe51327a2
font_01_sfnt_off0001397d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1397D 11028 bytes
SHA-256: 8e4a1d9d8296f1c712eeb9c29e0a15fdc81cd4a34182f32503339db8ab1e7ba8
font_02_sfnt_off000152fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1