Malicious PDF — malware analysis report

Static analysis result for SHA-256 b00a35a75f77dcaa…

MALICIOUS

PDF

104.3 KB Created: 2021-07-21 02:21:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 8a4d16c5f6f8aff5bb2ab599e7f69c64 SHA-1: 78559a1ec7e7ef28cee0049e0984c7046c034764 SHA-256: b00a35a75f77dcaafdeae9efd7437d6215a6a70e5be832e100d77040acf70ffb
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to external sites, some of which are hosted on compromised WordPress upload directories. The presence of these links suggests an attempt to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://soechi.net/userfiles/file/75488130588.pdf In PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/f6233b73d5d271e7bcd59d02858a0466/filew.pdfIn PDF document text
    • https://bdaudit.ro/userfiles/file/wuvagoxi.pdfIn PDF document text
    • http://francescofesta.it/userfiles/files/jowarabi.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160def179d6171---mofakavusi.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/56955692292.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da3849c6d50---tejevavob.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/4369b5678cfeef16577f5faa30c21495/17159139553.pdfIn PDF document text
    • http://bigdoughpizza.com/uploads/files/vowuwumaluseg.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/nijimujifefodifiwiraxa.pdfIn PDF document text
    • https://speeddating.lt/speeddating/ckfinder/userfiles/files/79824360814.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ab975c83ec8---90350231474.pdfIn PDF document text
    • http://valaptop.com/ImagesVA/file/nojogudaxebututifegufumuf.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/sasewusowubowonejo.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/67366f26bfa72598e74c140d0cb6c8e3/tulovisulev.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/9q48tnscpu80g15o1j6s89glv3/baroj.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/8942f5c8fef9c44c4e1d808c5c55d039/pememinelegadasam.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/r44r3s3r5ai1glpop2urahcf9j/69017362520.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c979b7b334---valumuxugerinubuse.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/1m6k23ekn4tv14136ojhqrjr5n/zadonopofominomegof.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/5adc86dae4725004d7149e4dd09779ff/vawedalarajavexadoguje.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0d5c1674e---rigafomu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=seventies+shade+font+freePDF 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_off00013707.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13707 17044 bytes
SHA-256: 33cc2fa7a6b0492c37f62faecc8a32f890da2bae57fe38a41e39c1c38156c9e6
font_01_sfnt_off000163de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017bf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17BF5 10544 bytes
SHA-256: ac8d9f31dc0d1677eda5cf26dd73fab6d52ec54cb298fa6f15a0929647b1822b

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