Malicious PDF — malware analysis report

Static analysis result for SHA-256 00da71098a59ce48…

MALICIOUS

PDF

91.8 KB Created: 2021-09-04 22:56:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a9f4bce53fd0a2e1a09919c6a375a7fe SHA-1: c6bb0d59e7e85fdea5766f425f824053038c707b SHA-256: 00da71098a59ce48e903e463b93d2252331f170e898d7529e0b69a74e06f8738
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 directly extracted, the structure and URL patterns suggest an attempt to lure users to malicious or SEO-manipulated content, potentially as a phishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://cuatro-pr.org/sites/default/files/file/toroxomekujaxoroxubal.pdf In PDF document text
    • https://alamansyria.com/userfiles/file/31597441765.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/a5d5d59e5e25b3766b7db9035df5f0c7/nufeguzosuguwinolaw.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160768b450f8ab---63253631114.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/fugegipebot.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16104a37dcddd1---86489045635.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083a81837ebf---65386218010.pdfIn PDF document text
    • http://digilit.ir/basefile/digilitir/files/dikubasirudanakupuparas.pdfIn PDF document text
    • https://oxi-dental.ro/imagini_ws/tagozazi.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da8a0cb6acb---88706950660.pdfIn PDF document text
    • http://dakmoto.cz/obrazky/file/37070798628.pdfIn PDF document text
    • http://zeroseistudio.eu/userfiles/files/ritorozog.pdfIn PDF document text
    • https://uclerbaklava.com/resources/file/77994555307.pdfIn PDF document text
    • http://crm333.com/documentos/file/18233561792.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/nezedufewazigolitizupajox.pdfIn PDF document text
    • https://airxps.com/userfiles/files/15633507811.pdfIn PDF document text
    • http://www.texaco.bargiel.com.pl/ckfinder/userfiles/files/wumalozivego.pdfIn PDF document text
    • https://attackworkoutprogram.com/app/webroot/files/ckfinder/userfiles/files/26755613582.pdfIn PDF document text
    • https://posaonakosovu.com/ckfinder/userfiles/files/21919414837.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/31031670429.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/5e7c7caeb661a452682e0dfe69655972/97444713811.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/669c2012ba140b4511aebbc2746a59bb/godowuwuvifeta.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/161129c775c55b---valinopos.pdfIn PDF document text
    • http://nsfeed.com/_UploadFile/Images/file/62777036919.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=pdf+larousse+encyclop%C3%A9die+des+plantes+m%C3%A9dicinalesPDF 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_off0000f31a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF31A 22588 bytes
SHA-256: 0602b7a3e4dd52841ee79660d91499143753baf279fdd541267d407e250711fd
font_01_sfnt_off00012c7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C7A 11152 bytes
SHA-256: 91b2ca6ff0c109f29e0322ec6da4ee6b3f8574d2919d778383aed1e5a8eba5ce
font_02_sfnt_off00014646.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14646 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1