Malicious PDF — malware analysis report

Static analysis result for SHA-256 a703c7bf4363a8b1…

MALICIOUS

PDF

97.5 KB Created: 2021-07-04 13:25:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b5444ee96baa4f1d670d2ab6d9f58d37 SHA-1: bd0d2534eec604f12bdbce9165e24f5da18f0a33 SHA-256: a703c7bf4363a8b11db7df632b20bb6be5e1ba4bb26f099012dcb79dc1fbf696
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress upload directories, indicating it's part of a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce8dfd2a342---33508741725.pdf In PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb54d3b4fe---25370475825.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/474ee5b1fc5dfe3664bf68cfa95078b2/murexepabo.pdfIn PDF document text
    • https://hizlipin.com/calisma2/files/uploads/dimoleruzas.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7ab7c2198---98230465888.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd992bc0b7---17899678507.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/lonodulutojoxogave.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/1j05fpttrjvdfugjgiajqlsef2/jupekugutajoloje.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/t28ov7r0h3jcvh9pdt62qid1am/gorigokimetiwubekolowili.pdfIn PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/3f41123b3a682e6913ef5566548ac560/79569913899.pdfIn PDF document text
    • https://satybharat.com/ci/userfiles/files/jefevijot.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b437f984b49---dewawoxutowojewu.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/fhtguqab5qs4lvodnsqjgqunqi/75760249378.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b499d77f806---28181062913.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/76a5dafd5dc61e1987d39b83540e1533/navitod.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/2ca70bb29f9c8d68631f8b03875b1af2/vogavuvojelapuvum.pdfIn PDF document text
    • http://huile-de-nigelle.info/userfiles/file/96559212869.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/84sr46ad5huf1r8gsq5omt9jtg/nalumisiduxisepuzet.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d2a206798e0---gulenejaje.pdfIn PDF document text
    • http://envigest.cz/upload/file/mesufanopemerewasop.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/959f77ef8b2837eea6c6387906cd5ae9/lapijutujogiwewaj.pdfIn PDF document text
    • http://score1forspencer.com/clients/4/45/4587145e2679cb7673d0e21b436e5c25/File/19607225056.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=hippocampus+and+depressionPDF 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_off00011c15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013427.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13427 17124 bytes
SHA-256: 4d5e6b86d0827004ea787b98650928366333d2ce14ab76c9aaaf6df34a297e93
font_02_sfnt_off0001608e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1608E 10620 bytes
SHA-256: cd6beb9f91114acf876f9fbe8f34f01291eae9f152d70d5a4772c40d76e16266

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