Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5d8bf4fdf1c7734…

MALICIOUS

PDF

82.3 KB Created: 2021-09-02 12:06:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 429c2897ca05d513601bd7aa76fc0cb3 SHA-1: f34f04c126038968c2d9462b39a66a757411f2aa SHA-256: f5d8bf4fdf1c7734ba072320bddd080dbd163918ee83c08d34e5ef4b4a0bd18b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous embedded URLs that function as a link farm, directing users to potentially malicious websites. Several of these URLs point to compromised WordPress installations, indicating a tactic to leverage legitimate but compromised infrastructure for distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://drafthe.ru/uplcv?utm_term=manualidades+con+material+reciclado+para+ni%C3%B1os+de+kinder PDF link annotation
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/710590aeb65274bbd0a91f9c1a1a6b47/74037781899.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/9231a5358fbf6dd0088002b6e4951596/nixenivo.pdfIn PDF document text
    • http://thermocomfort.ca/userfiles/file/nalosagixafuted.pdfIn PDF document text
    • http://szwygs.com/upload/58027881714.pdfIn PDF document text
    • https://akilanews.com/ckfinder/userfiles/files/saniduxiwejasulizufamo.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/f2e5b55897515cad5653a0c7a1b285e2/divumurixezafu.pdfIn PDF document text
    • http://agriturismocorteerbatici.it/userfiles/files/janofomiroxofog.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/tafijafuvelaloronere.pdfIn PDF document text
    • https://savitravel.ro/ckfinder/userfiles/files/vilixipagowaleto.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/fe3f9st0csr7h60g5mpr3ltc8s/92225338689.pdfIn PDF document text
    • https://gymlesgeants.com/upload/editor/file/23870227029.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160906c1844dab---21455139326.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b50a973939---nomaxupatilixadejabed.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/f0dae0e608f394dddfd460b4f6a48437/22610678794.pdfIn PDF document text
    • http://svarovani-tig.cz/userfiles/file/46290641836.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/37608055380.pdfIn PDF document text
    • https://francois-daulte.com/ckfinder/userfiles/files/81846655488.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e023a333b---41658428718.pdfIn PDF document text
    • http://www.swaving-stalinrichting.nl/ckfinder/userfiles/files/9430702466.pdfIn PDF document text
    • https://fengshan-zhennangong.org/upload/ckfinder/files/weboluporikeve.pdfIn PDF document text
    • https://betenagro.com/sites/default/files/file/rakujovisemijiwajekomi.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/05c97e8be41231c3336514cb3b9af966/tifugenakirabiku.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/22662344692.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/vozulenavolejejat.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_off0000d85a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD85A 11064 bytes
SHA-256: 8a8c5d8dde2596516d183d22ff9d7ec2c9c23610c0ae25c74389d61728f6a9ec
font_01_sfnt_off0000f1ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1CE 18324 bytes
SHA-256: 3bc11737cb2982c219daf71f524d05278185d359f78e1bb5fa03598a8cf5be85
font_02_sfnt_off0001205e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1205E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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