Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c7308c5e5de5547…

MALICIOUS

PDF

97.8 KB Created: 2021-09-05 17:25:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 989051cbfc1adad43e0844075d6c938e SHA-1: 91d2cdedf3f653050925c8c722bf36335277bd88 SHA-256: 4c7308c5e5de5547e4a90062f6fe8917db3d545eebc4e3cafec58bc20250374d
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the structure and URL distribution suggest the document's primary purpose is to redirect users to potentially malicious or SEO-manipulated content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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 http://chaitraglaze.com/uploads/20867278724.pdf In PDF document text
    • http://it-hair.com/userfiles/keruripezazu.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/3765a35dbab8a8cd6d4e38327ae1c01c/51490423929.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/57232269719.pdfIn PDF document text
    • http://hkwwta.org/userfiles/19537368882.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d77b99af98---ximiwadabofalowoxe.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/kokozuxitamuxed.pdfIn PDF document text
    • https://blv.by/upload/editor/files/77244745109.pdfIn PDF document text
    • http://apartamentosalbatros.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8802cc54da---26014523135.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160d5e7fa76f40---6119562546.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/se2dj3hrupuqv5g1cf3rte3l15/5828271244.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/8242a991df59d1194cbd9a6a7aacf182/63527702178.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608bce3bb6ba6---lufukebidadeno.pdfIn PDF document text
    • http://immodraft.de/images/architekten_agentur_images_/file/49481645996.pdfIn PDF document text
    • http://fatename.com/uploads/files/202108250248192587.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/98525683047.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/sixamutupilisexigewipunis.pdfIn PDF document text
    • http://holzbau-napetschnig.at/zegaguzulowasu.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/4ug6n1ho62f8tprqasn783lm20/loxoxodegelufanaworako.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079dfeae06a9---vetazutedetigumugugi.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a71f63a5efa---ninubusudufafomukuvedu.pdfIn PDF document text
    • http://abogadosaguilar.com/ckfinder/userfiles/files/pokimazojenunizoxevi.pdfIn PDF document text
    • http://bbhshipyard.com/userfiles/file/64184308473.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/mt4cmu5kbjvfj64t2qqnp5vge3/73031166017.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=andhra+pradesh+ministers+list+in+telugu+pdf+2019PDF 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_off000117b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117B6 18384 bytes
SHA-256: 6a4d1e19db22b4221a5653900d6693012cb9a37550d2cc9081a05a240f997ad5
font_01_sfnt_off000146ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146CA 11368 bytes
SHA-256: 02397257da93e3a8e8307e731b09442527c0e96039068fa4c3a2a7ca4403d7b3
font_02_sfnt_off00016143.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16143 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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