Malicious PDF — malware analysis report

Static analysis result for SHA-256 10dfba98a30eecee…

MALICIOUS

PDF

71.0 KB Created: 2021-10-03 06:24:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6b51ba441429378ea3875c03d9935315 SHA-1: b43635a6448649d11fb41f6a037b47626e9405d9 SHA-256: 10dfba98a30eeceeebb84dd5b2f83bda6d639eff24ef680946c73b4b1527067d
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with multiple URLs pointing to compromised CMS uploads and disposable hosting. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure suggests an attempt to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://lexxyin.net/files/fckeditor/file/28585426479.pdf In PDF document text
    • https://zaindu.drogomedia.com/files/galeria/files/mojixim.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16141cf9f9a4ac---fekevepopikerureb.pdfIn PDF document text
    • http://bebaldebaran.eu/userfiles/files/96685652803.pdfIn PDF document text
    • http://crestviewshopping.abwingsmd.com/uploads/files/30415277795.pdfIn PDF document text
    • http://enricobarraco.com/files/16747037195.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/g21960afm0qdistcv64ipi30pg/lemapivazukalurogesol.pdfIn PDF document text
    • https://maychieuvinh.vn/upload/files/bedenirarulapuxajoka.pdfIn PDF document text
    • http://bigyikesmedia.com/home/xtremweb/public_html/consultinstitute/web/upload/files/59856169762.pdfIn PDF document text
    • http://poketomecam.com/uploads/files/54603221464.pdfIn PDF document text
    • http://pmrs.ps/userfiles/file/98437298176.pdfIn PDF document text
    • https://singhaniabrothersltd.com/ckeditor/ckfinder/userfiles/files/rimojofipezolobopo.pdfIn PDF document text
    • http://afinamebel.ukrkarta.ua/fckeditor/userfiles/file/ridagetazar.pdfIn PDF document text
    • https://lee-trading.tw/archive/upload/files/92801378776.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/5i73ic9imtjkt81gek1tnd077b/vezubukegazewim.pdfIn PDF document text
    • http://antansconstructions.com/ckfinder/userfiles/files/56886506383.pdfIn PDF document text
    • http://seasonsblinds.com/uploads/ckfinder/userfiles/files/vufatezutulewupapusa.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9d6aecada3b827d12a132a675d7e5fae/vibejiwuregaremek.pdfIn PDF document text
    • https://deycaterers.com/ckfinder/userfiles/files/vexejek.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/binuxolibifawerawek.pdfIn PDF document text
    • https://cs168.tw/upfiles/editor/files/84300519378.pdfIn PDF document text
    • https://studiovizia.com/webroot/img/content/files/tobazogog.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/ipfbovb2kuqflcturq1qjh5on5/59890247929.pdfIn PDF document text
    • https://gemwares.com/userfiles/file/83562369642.pdfIn PDF document text
    • http://ingegnasrl.com/userfiles/files/vogazotujusiroratix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=multinational+strategy+examplePDF 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_off0000b4e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ccfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCFD 10904 bytes
SHA-256: 885a12ef6d9fb01da3a3587d95b7b8546e671be6dd7f2d7ab0991fa20d42a03c
font_02_sfnt_off0000e643.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE643 15756 bytes
SHA-256: 8cdb2d235164327d9770b741e7d21107a2e0094566d1be044a0869665fa89091