Malicious PDF — malware analysis report

Static analysis result for SHA-256 0358a0e3bea30cc4…

MALICIOUS

PDF

124.5 KB Created: 2021-06-26 09:15:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 43896967bea49668b0ec4c45317863e2 SHA-1: 9b594a3d9833e036592934a2e824e41bcdbc3684 SHA-256: 0358a0e3bea30cc462c9a18b13cdb6ab8944febafa38b4deb92f27c2d52a7a3d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the PDF structure itself point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9921

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://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a590bdb7f1a---sewixaxanimigotivufajizik.pdf In PDF document text
    • https://visionbrindes.com/admin/fckeditor/userfiles/file/garamusipovejufufaxokuz.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/571b6fa699595d0ce915f57432f9eeb7/pifusatazizaxofekafa.pdfIn PDF document text
    • http://exmar.it/foto_fck/file/bemeditesodipadu.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/iqi3a57m7fmp04jhmcls6dufb0/mebafera.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/16079445272c03---58365218449.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8f6f8adc1---16737238700.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8eaa17f4c---4916653576.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c394cec4c1d---wixitidolopifetigemojinor.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b78eb9a37fe---44534361582.pdfIn PDF document text
    • http://bsbcarpet.com/userfiles/file/mobesonapuguwikajozewolop.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/17039176107.pdfIn PDF document text
    • http://omni-links-europe.com/soxokixaneborarukuloluf.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f92350d507---39921591512.pdfIn PDF document text
    • http://eltonltd.ru/sites/default/files/uploads/99027528048.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/16090febaac582---xilebotirijesarur.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/e240f9ccea58371874e0d4c3e707d88d/13513815487.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a171cc4b10c---zukokolenebidepetewir.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7428bd078c---befojanekowitedefel.pdfIn PDF document text
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16086f29952abf---pomexujigerewa.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/j28s9st17j6uj9qbga5kv4pdo0/21955951188.pdfIn PDF document text
    • http://posekatzahradu.cz/files/file/kesigirafibidogavik.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16082215e9c768---24891635601.pdfIn PDF document text
    • http://cameragiaminh.com/upload/files/rudosuxijedo.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a69ea090338---35485752288.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=old+pen+featherPDF 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_off00018653.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18653 10240 bytes
SHA-256: e9bfeebd154395b23e546c4527072a759dc4afdc34fc82cf5360b4f3f56e9e9e
font_01_sfnt_off00019d48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19D48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001b55a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B55A 18504 bytes
SHA-256: 2c507e05ec57fd4f7f080a47018b68055e1affbcced114e36c0812f6a02baaf1

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