Malicious PDF — malware analysis report

Static analysis result for SHA-256 f14105fd0bd5b195…

MALICIOUS

PDF

110.6 KB Created: 2021-07-26 08:31:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4120a6b34abcb58470da497d633a6936 SHA-1: e63af5f39ef9def4f2dab88135f360d3e5b15b74 SHA-256: f14105fd0bd5b1958f6b67c0f761f581c05cdd5b7409fd45345010c47a13ea99
156 Risk Score

Malware Insights

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

The PDF file contains a large number of links, many of which point to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The primary attack pattern observed is the use of a link farm to redirect users to potentially compromised sites.

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://ailani.org/wp-content/plugins/super-forms/uploads/php/files/ab204c6a74ee00a93984cf208a21f51c/46435938074.pdf In PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/6399fe29a50800f09fc0ea3b050f6961/11059042923.pdfIn PDF document text
    • http://studiosaletta.it/userfiles/files/xexuboviza.pdfIn PDF document text
    • http://xn--80aamdqpfpr.xn--p1ai/upload_picture/53799063710.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/60655094350.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/377e9616beb085b3dcee70179443e30d/zitagepegoziwekevepixori.pdfIn PDF document text
    • http://firanywiktoria.pl/uploads/editor/file/tuxubudagamuluv.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/85538048055.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/77702191dba88f1c762775c5a2b8a518/gupusanakixatajisa.pdfIn PDF document text
    • http://euro520.net/userfiles/file/1622401257790932613.pdfIn PDF document text
    • https://www.nitdgp.ac.in/uploads/userfiles/files/13103561659.pdfIn PDF document text
    • http://svsteinfurth.de/radsportfiles/file/31996373303.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16088c3ec92ba1---23254119887.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb78b6c13c---1001027430.pdfIn PDF document text
    • http://bukharasuwanee.com/sites/default/files/file/fagimiligiwemikodira.pdfIn PDF document text
    • http://araonline.hu/uploads/file/dodurezomagixi.pdfIn PDF document text
    • http://raffaelecavazzoni.com/userfiles/files/79757438919.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/1fcf922b0e3b8004b54003dc4dada675/gikufapewatefigi.pdfIn PDF document text
    • http://www.kymenhome-etsinta.net/tiedostot/files/fadenerexiga.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/dixebaxokawafipilexolasi.pdfIn PDF document text
    • https://tnmkor.com/FileData/ckfinder/files/20210710_88AA6C65A199D39A.pdfIn PDF document text
    • http://yangpupark.com/uploadfile/files/viwegefisorulonu.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/pofamovajobexepukisobi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=qual+a+diferen%C3%A7a+existente+entre+ra%C3%A7a+e+etniaPDF 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_off00014545.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14545 20796 bytes
SHA-256: 7f5f0786ebbb5230928e82b77f985f89409bd2fad53de9a4029d00edcd84df02
font_01_sfnt_off000178fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x178FE 10688 bytes
SHA-256: 5f035c12fa45c0a5bc75ba3ac35245a47cc07ff20c7d8172ee61f4d8185c71ed
font_02_sfnt_off000191b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x191B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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