Malicious PDF — malware analysis report

Static analysis result for SHA-256 93037d35c7d96a53…

MALICIOUS

PDF

79.6 KB Created: 2021-09-09 23:09:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: db18e36673688553c7649cc4fd6ff65b SHA-1: 5d761d9d6a98c7813d5e2a401bfde94b2a752f9f SHA-256: 93037d35c7d96a538e2581ac2719d1f6a687441060262aea9e57c643d3e5c324
96 Risk Score

Malware Insights

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

The PDF file was flagged by an ML classifier with high confidence. Static analysis revealed it functions as a link farm, with numerous URLs pointing to compromised WordPress upload directories. These links are likely designed to redirect users to malicious websites or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://cructi.ru/uplcv?utm_term=x96+mini+rom+android+9 PDF link annotation
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/161378f042c36a---gogoroxugulitaxerixu.pdfIn PDF document text
    • https://nabijdefossa.nl/upload/files/tuzarejulazuj.pdfIn PDF document text
    • http://nage-z.com/ckfinder/userfiles/files/85610257388.pdfIn PDF document text
    • https://officialbacknumber.org/editor_up/84484427799.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd9d199aaf---7864839099.pdfIn PDF document text
    • http://wolfroccatiassociati.it/userfiles/files/75468617181.pdfIn PDF document text
    • http://studiogiamberardino.it/userfiles/files/repabixiv.pdfIn PDF document text
    • http://ventima.ru/userfiles/file/59215443176.pdfIn PDF document text
    • https://obermeyer-modemarkt.de/upload/file/babaralikenupupij.pdfIn PDF document text
    • https://beta.nhatthiengroup.com/files/uploaded/files/likobiwizefevenimotatumag.pdfIn PDF document text
    • http://cokhiminhhien.com/media/ftp/file/19957263017.pdfIn PDF document text
    • https://hotelite.in/userfiles/file/54850882541.pdfIn PDF document text
    • https://locktactyuma.com/ckfinder/userfiles/files/85390544064.pdfIn PDF document text
    • http://coffee33.ru/archive/file/tutabipowagarelat.pdfIn PDF document text
    • https://nordiskvillaventilation.dk/userfiles/file/91418273967.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/lusatetes.pdfIn PDF document text
    • https://digireg.pl/upload/kokodumemopetami.pdfIn PDF document text
    • http://zanethompson.com/userfiles/file/30732548701.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/c6e6055b48b1585ca51deef64959a3cb/17072370652.pdfIn PDF document text
    • http://archbot.pl/files/file/jaselobagefatudisidizelof.pdfIn PDF document text
    • https://dakhoathienhoa.net/images/files/38026136091.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/a689d0ef37e7ed0875deaa63246949ca/gikakodupok.pdfIn PDF document text
    • http://podhoru.cz/userfiles/file/16220713117.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_off0000c9a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e1b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B4 21196 bytes
SHA-256: 0ebb231065d2b7d5bc586c8f482c0963ae36f1382e47519096246c3d45b005a1
font_02_sfnt_off00011a18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A18 10308 bytes
SHA-256: 3a3e44c6362b5696f63d535323cc97e8ab7754136ff61948acabd94694a55b3b