Malicious PDF — malware analysis report

Static analysis result for SHA-256 b50c1efa5cdeff1f…

MALICIOUS

PDF

80.3 KB Created: 2021-09-03 08:01:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 26abdf4f225e28acc1ebbbbe1bd888d3 SHA-1: 5cc241c61abdef716e8438fd33b564eb8de603cf SHA-256: b50c1efa5cdeff1f082083143f05a583bac2e4cfb42a46f4273efc8f87337554
96 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to compromised WordPress sites or disposable hosting. The ML classifier strongly indicated maliciousness. The presence of these links suggests the document is designed to redirect users to potentially harmful websites, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://krisoc.ru/uplcv?utm_term=social+skills+worksheets+for+autism+pdf PDF link annotation
    • http://3xlove.com/uploadfile/file/37233148908.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adb94674cec---sifunokababuxusubus.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dca3e8a0214---dezekusuwilodufagavanulem.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/fivixevawamegodewejugan.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/80014973972.pdfIn PDF document text
    • https://jamurgoreng.net/contents//files/48642412396.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/vitobokinoranogovifenup.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/93890712001.pdfIn PDF document text
    • http://gfhs1978reunion.com/clients/56625/File/43978354993.pdfIn PDF document text
    • http://dmkert.hu/files/file/dodemag.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/081256509188.pdfIn PDF document text
    • http://colleges-in-tamilnadu.com/FCKeditor/userfiles/file/52413179899.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/89812359805.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/16087fa1cd624e---xaninonabu.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/d9cc54107e819f7e22fd8af89c49c78a/91730107203.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/73507909948.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/2021062511052733097.pdfIn PDF document text
    • http://versobrokers.eu/userfiles/files/tobusasagikuxigudigipo.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/90129594171.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/lt8ndfg5ev1rmhn47h5bfbn7d3/befutowuwojizozavepiguru.pdfIn PDF document text
    • http://bankerz.in/qpic/files/sipiwor.pdfIn PDF document text
    • http://lapempi.nl/ckfinder/userfiles/files/32854894786.pdfIn PDF document text
    • http://aotwresort.info/ckfinder/userfiles/files/suxusuguxevo.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/47393150604.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/3752444234.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://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_off0000d3e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3E0 11136 bytes
SHA-256: d8f25f3140a846a5e7acc2424e9dc964ad5ddf06c32d5d71979d31550c4a7b70
font_01_sfnt_off0000ede8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE8 17516 bytes
SHA-256: 4864d1e879ed568c0fe14bc25583da69638251b46c21f4e70fd0be62cf946591
font_02_sfnt_off00011b2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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