Malicious PDF — malware analysis report

Static analysis result for SHA-256 25db2632a36a41f3…

MALICIOUS

PDF

91.5 KB Created: 2021-07-13 21:27:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 22dba301fbf06cee3631f39f10417d7b SHA-1: df8a4f7bfedcd95cc5456eb0e58a04f1ac39c04b SHA-256: 25db2632a36a41f3698a7d18b1ef77d94f0c824e7941a6ae19991484f1547a3c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress sites, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://garglob.ru/uplcv?utm_term=colourful+periodic+table+pdf+download PDF link annotation
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/4584610270c3730480755b5a81695991/nasimadevale.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ce23cf5be83---rukakitovisepuwi.pdfIn PDF document text
    • http://sbnjl.com/userfiles/files/27915720242.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/86osje0k19hkutttqf53hjo2kh/mijavabolijufunujezexejon.pdfIn PDF document text
    • https://aulacvn.com/upload/fck/file/liroxigada.pdfIn PDF document text
    • https://rubyyadav.com/nbloom/fckuploads/file/85044980996.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/o5ute3b0835v8lhr5ic9pveudv/fupupob.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cde1e5ead0---wuwerutumop.pdfIn PDF document text
    • http://fruitvita.com/files/files/92345989536.pdfIn PDF document text
    • http://1utilaje.ro/mm/file/98140057163.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c73288cadef---jipajawosuxipuba.pdfIn PDF document text
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/rajajarafafemokovovivoxib.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160baa9c0ebc1e---51519573721.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b0fd19a0337---89396345727.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bc876ef3d64---68629575777.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608b153aab5f2---panefuneju.pdfIn PDF document text
    • https://marbellamohali.com/wp-content/plugins/super-forms/uploads/php/files/39fcb0432e769617444e46ad1ecc4df4/jujedufadanutopafenafez.pdfIn PDF document text
    • http://broeinest.org/ckfinder/userfiles/files/xedasupe.pdfIn PDF document text
    • https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/6d2510a7797dd6ac6f3825299d8617ad/zilabokutibomidojadozaziv.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160971b615a7b3---suvigobofufawasujeduveb.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/7f886b7d40a431411ba83c23fae23c13/jopaxajub.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/cc02db5133055a05231aa9a6261e4709/kataripotabisuxuj.pdfIn PDF document text
    • https://wegofa.com/userfiles/file/xememadofegefoxojo.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/c3d679cd703c5b00fc57a3419e3759c1/nozamopanodedilarife.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_off0000fd73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001158a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1158A 10804 bytes
SHA-256: 7ee57be24cd017466c32578ed8927db84b5ff65813984412ac93066ac8ea9b32
font_02_sfnt_off00012e5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E5F 19008 bytes
SHA-256: d12da70defaf0a6f014dda63f0dfb5a5c3aad2e2fd54a26db4e04ba4a1a3d851