Malicious PDF — malware analysis report

Static analysis result for SHA-256 26fdce5ad963c218…

MALICIOUS

PDF

99.8 KB Created: 2021-08-05 16:11:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 98ca0078adbf13bcf2e5c283ded244b3 SHA-1: b1c4fe9298239b498dc3b89f1efffcea56d7d8d1 SHA-256: 26fdce5ad963c218812f681aa4b8a0d798d593dc97c555df61b2c0ae80713a91
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous external URIs and links to compromised WordPress upload storage, suggesting it functions as a link farm. The primary purpose appears to be directing users to external sites, likely for phishing or to download further malicious content. No scripts were extracted, but the PDF structure itself is indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 https://pixomot.ru/uplcv?utm_term=caida+libre+y+lanzamiento+vertical+pdf PDF link annotation
    • https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/e088894981305d9dcd230c7575de5fd8/puvagixodulanira.pdfIn PDF document text
    • https://ilcaminodaugo.it/file/26842458169.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/pajunurapanoradeposiwok.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/maeuh5ns06um29rv0285u1m8f0/75237104594.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/bp5o1bm9ta0m8rdlv3fa92o28l/33920701966.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/6be7bf5301e528f1c583ccbd85c850f1/72039523359.pdfIn PDF document text
    • https://777mto.com/contents//files/wamodikamopepugugosidune.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160769ea4ac0c6---dajamosopido.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bf57b787ba8---wijugijogitalazixux.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5c008b554d---19869472104.pdfIn PDF document text
    • http://stinpo.com/ckfinder/userfiles/files/rukotujogimife.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1624656032.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/qfmfaubu33tsaf4k22qcpaubl0/3693086209.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8122ee232---16370871535.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/45542ca9f105bd34fd7a9fd1fd43c8e2/58949410050.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/79373881661.pdfIn PDF document text
    • https://relaxbotanika.cz/ckfinder/userfiles/files/darox.pdfIn PDF document text
    • https://etimes.mn/uploads/files/42701438267.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16072ba4acd90f---pulawesogukizibedule.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609493f9960f3---90636455844.pdfIn PDF document text
    • http://shop-cartuning.pl/userfiles/file/rasexofogizosipeseg.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f484909bfc1---modebogipezurudonad.pdfIn PDF document text
    • http://wabasnb.com/files/fckeditor/file/93293630260acb3f572644.pdfIn PDF document text
    • http://ltmetal.com/userfiles/files/vamepe.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_off0001183b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1183B 20344 bytes
SHA-256: 2426d5aa995e5831f4f2667ff9eac9f54ec75ea00cde0bfefce77607637ce204
font_01_sfnt_off00014db4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DB4 11024 bytes
SHA-256: 8c9da822d6eabc89a65b23134ae1f51bcebe725a6b9f45d94fe2bf1c3863b351
font_02_sfnt_off00016728.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16728 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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