Malicious PDF — malware analysis report

Static analysis result for SHA-256 085616fa90a78014…

MALICIOUS

PDF

94.8 KB Created: 2021-07-16 19:05:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 015cbab58c811ca7d698e967942a5cda SHA-1: a9f795273a682fdb9467f354ffc295edf6ad5131 SHA-256: 085616fa90a78014b0e0accc635231a61b2b18450f0bc76ade8c679486ca8786
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The ML classifier and PDF heuristics strongly indicate maliciousness. The document functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, likely intended to redirect users to malicious content. The presence of multiple PDF link farm indicators suggests a coordinated effort to distribute malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

Heuristics 5

  • 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://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/b04e0d9d6846bc2df40c5583e030a251/dabiguxatopaboluwef.pdf In PDF document text
    • http://studiodispirito.it/userfiles/file/67826012315.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/5ef2bdbf40e22c0773ef9c98e994b7cb/96503048181.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/97c0f6847a537e962c42f5a9ea08e2d3/sekilefubuve.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/m9gg8cq5eerdha1s9jvni9ko2p/rosopeti.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/dc386eacaef3e7f81d23badcf6e7ca43/98804678269.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/zolifilope.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/norin.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/pu3g3bo29jqc3f2t1skunjpehs/29196558360.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/66482705788.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5d6eb3474a---bimalenunosusa.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16078286117bcd---98770414050.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607608bade2af---zunaboloweganoxexevej.pdfIn PDF document text
    • http://azseal.net/uploads/userfiles/file/55616964998.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa9c75729b---tiwinadiji.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16089ddfdf0504---37449985472.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072593c53d6b---26548905104.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/kusarurovituvudijus.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/b4ci1o49476musirvvrnkgqg71/43252008379.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160867f9aeed7e---vakomexitamoduwoso.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16093e6b28413f---jakeweromawewani.pdfIn PDF document text
    • https://ebooksweb.net/files/file/3988073881.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082de6d3a1b8---53165837577.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607e012cc0740---befajapelefapufuze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=what+is+the+use+of+boiler+in+shipPDF 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_off00011058.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11058 17320 bytes
SHA-256: 948a72f1644be405e7f40b81363c6f086c476bf17b038694f2b0b4e677470931
font_01_sfnt_off00013db4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000155cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155CB 10688 bytes
SHA-256: 4575ed994c6aceec715fc9887f0ddeb37fca935bc416e214cbcbfcb19a4282b1

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