Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecb0b9b66b4a929c…

MALICIOUS

PDF

101.5 KB Created: 2021-08-09 16:48:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 945444348f1e073032b0121f685cf7b7 SHA-1: 474976a373f069b94cd588978a113390d2d9be87 SHA-256: ecb0b9b66b4a929c477fa897bd2454e1950cb0acf2390ed11f89830722d6fa9a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, providing no further context on the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9878

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 http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160877a831266a---lokejuwomeli.pdf In PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bf02078f2fc---90243387566.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/18082601166.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/161092a81de361---jofapuxeluma.pdfIn PDF document text
    • https://ultralloy.net/upload/files/besutosasiburow.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/cmkap5jqhljf587mc0ogrh6a2h/3229643513.pdfIn PDF document text
    • http://klefmarken.se/upload/file/58185811793.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae893ac360---46574631993.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c12336cca---kujevuzozibesop.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160f8f8619609e---86992058928.pdfIn PDF document text
    • https://brod-plovdiv.com/images/84689578263.pdfIn PDF document text
    • https://stijsr.com/userfiles/file/80334093672.pdfIn PDF document text
    • https://apinero.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072207b7d02f---57883320684.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608703c1e8a01---24170772034.pdfIn PDF document text
    • http://xn--rssx31a7tec6p.com/upload/userfiles/files/20210706185810.pdfIn PDF document text
    • http://bradzo-ep.com/uploads/files/durabejubun.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e971b302c8---xabefamunodiparozi.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607ecec3db24d---77288188213.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/88965543449.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c0b03b6ddf75e80d58fc6c5edce121dc/pivedalufijoso.pdfIn PDF document text
    • https://campermagazine.tv/public/file/81294086737.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607af85bacb77---pesisun.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16080e782abb2f---6411447362.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/6eomo9dshqp5fhe2pqm32afhm4/96617131483.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/c7963cfce7aa53082c24d3208902fe7d/26993897110.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b1de9e5c6c0---19941170691.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/cqn1ceqrbi7r394iro08pggl22/jufimaxu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=chiffre+espagnol+en+lettre+1+%C3%A0+1000PDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/fe2111a4fee778658e2ba4834caba697/8418435953.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://etablissements.ac-amiens.fr/0601178e/quadriphonie/IMG/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_off00012248.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12248 11024 bytes
SHA-256: 67888af74d7f89fa2955c0f35a1820afd5d1d5aa81dac95198eb840185dcd2e7
font_01_sfnt_off00013b8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001539e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1539E 20164 bytes
SHA-256: 803295b97923cb07ed470deca2659cdb80c8e97cb47f71706c82aa4cc0e6987a

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