Malicious PDF — malware analysis report

Static analysis result for SHA-256 818981c842bed7b2…

MALICIOUS

PDF

84.3 KB Created: 2021-09-03 20:59:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f073fb8a2cf0e32664c04cfd95b0c5a2 SHA-1: 5dcd274b942f505bae50aecc2ba83947d512c97b SHA-256: 818981c842bed7b24c7ca74629ad17f249e7c05f8b6d52a1e837912e7d3825c3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by a ClamAV signature and an ML classifier. It contains numerous links to external websites, many of which are hosted on compromised WordPress installations or appear to be part of a link farm. The PDF's structure and embedded links suggest it is designed to redirect users to potentially malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/e9f366f74bdba8254c32770bf95496f8/wibaluxibitapu.pdf In PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160da5ec44a85a---geguvugalanoxutuzibukare.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16126b04573ce5---surenimir.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dedc8985843---16495660563.pdfIn PDF document text
    • http://szjwwj.com/userfiles/file///8155443477.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a176471305e---97663680493.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/19599448925.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/81589947216.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/3e5c461732b288c59ef87b0a9ba1a71c/78236286484.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161269dce9d368---69774152875.pdfIn PDF document text
    • http://www.moyekolodin.com/files/rusadapotemopixoj.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612d6a39eab30---vewebozomiladufo.pdfIn PDF document text
    • http://cokhihoaiduc.com/uploads/files/97086990262.pdfIn PDF document text
    • https://marikakozmetika.hu/editor_up/xanulamumunofewajutajojov.pdfIn PDF document text
    • http://songhakbbq.com/uploads/files/13079748431.pdfIn PDF document text
    • http://lateonsettay-sachs.org/userfiles/file/10795693487.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160aa97be09ac4---3147638164.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/7bvnjb62enno3k4dknf2cqgaof/sasure.pdfIn PDF document text
    • https://forssh.com/userfiles/file/53704089472.pdfIn PDF document text
    • http://julianina.de/upload/file/mujurok.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/a4dd91488a0bfffe68a02d7bd56cc5e0/99586498179.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fa92da3584e---pafelobarolodiwefutituvuj.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/eeb77a9930cb652db25ecfa95e0c62cf/jedejojosap.pdfIn PDF document text
    • http://bonsite.nl/phpcmsys/file/26677931609.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=money+word+problems+2nd+grade+pdfPDF 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_off0000e599.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE599 16988 bytes
SHA-256: 90eac7935ad542e6b2c8cd4ef90fba62e1ce19ded30e5169ae972c8b64695d59
font_01_sfnt_off000111a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111A2 11104 bytes
SHA-256: 42e7e0ed304dd74d17b49dab6bf67510bae780b0be5552aa158eed3ff52b5c30
font_02_sfnt_off00012b3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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