Malicious PDF — malware analysis report

Static analysis result for SHA-256 690d0cf83df8fd6c…

MALICIOUS

PDF

79.6 KB Created: 2021-09-05 20:33:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2a4d4da4f7e00c26087947b3dfbfa57a SHA-1: 6068a5feb79c9c65ae9f28c27ec04c3ccc281807 SHA-256: 690d0cf83df8fd6c3f16ef49c4a057a5ebe93c053b6fa458f1fa96384e1c3d07
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm pointing to numerous websites, many of which are hosted on compromised CMS uploads or disposable domains. The ML classifier strongly indicates maliciousness. While no scripts were directly extracted, the structure and URL patterns suggest an attempt to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://btcauction.vn/hinhanh/file/56409977899.pdf In PDF document text
    • http://myphamnanyno.com/luutru/files/tumizuvu.pdfIn PDF document text
    • http://primehorseproperty.com/userfiles/files/20356403368.pdfIn PDF document text
    • http://aj-logistics.com/stock/userfiles/file/59812310490.pdfIn PDF document text
    • https://52fantasies.com/home/holly/public_html/ckfinder/userfiles/files/49547972266.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca40640ffe---femalukuxefarizelukat.pdfIn PDF document text
    • http://muaah.ca/userfiles/files/tutamimejupuzeludoj.pdfIn PDF document text
    • http://ash-graphy.com/userfiles/file/biniduvuxeli.pdfIn PDF document text
    • http://pphjako.pl/userfiles/file/xugizufozo.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/91afcaa661be1769cafc62b80a948a5d/vasadagox.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16080ca1eabeb2---74091761776.pdfIn PDF document text
    • http://abwcoliseum.com/uploads/files/tiziz.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4759c82fe---nogilovabeduwekuzafazo.pdfIn PDF document text
    • http://oceanstatevolleyball.org/clients/879495/File/raziranaxasewoza.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4538d81004---wipuvuwavavetiko.pdfIn PDF document text
    • https://saksisan.com/upload/ckfinder/files/31067907263.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/16080f1ca02ba5---ritujizikuzewimapid.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160736e912ec69---desufononifudi.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076abe875cc3---jisoxelej.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/magumebewadesipapirufak.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607bacf078ca9---zefuzekezetorilasupewabup.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/4k2orf5vvq6u8ca9mq8ep452a5/52579860189.pdfIn PDF document text
    • http://cy2hand.com/userfiles/suxawukobijiwutadokede.pdfIn PDF document text
    • http://hatowo.com/app/webroot/uploads/files/pugizemat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=plotting+points+on+a+coordinate+plane+picture+worksheetPDF 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_off0000cb45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB45 11072 bytes
SHA-256: 3f771548a48a03ca161c75e18984e27f564d47ef773e09662befc8d2014d622f
font_01_sfnt_off0000e4e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E7 18844 bytes
SHA-256: fac2f50528ad0447adb245f2d92ffb8138293e05d5c66106b26e73197d3e33fe
font_02_sfnt_off00011661.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11661 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.