Malicious PDF — malware analysis report

Static analysis result for SHA-256 17d3380c6d25c3a9…

MALICIOUS

PDF

82.8 KB Created: 2021-09-10 19:44:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 35e1b87e8d90102c9aff28ada0a30dda SHA-1: f83094896b754f43be6faf4c3d81175e45fce944 SHA-256: 17d3380c6d25c3a9c3a210a9bae02688bf480e6bfc40b47d4340f300bf0479b0
104 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://landonintergroup.com/ckfinder/userfiles/files/xojefaboxa.pdf In PDF document text
    • https://airflow-skateboards.com/upload/file/kakitoreloterituradig.pdfIn PDF document text
    • http://diadiemvui.com/upload/files/ranobasamorem.pdfIn PDF document text
    • https://www.meditech.cz/ckfinder/userfiles/files/rumejunijedafulinuluz.pdfIn PDF document text
    • http://pluimveebeurs.com/userfiles/file/wotoxipexerutipor.pdfIn PDF document text
    • https://songhong.info/userfiles/file/xijibudoxelefagaxono.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/14122221848.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/108214dfd8e45c902cc691e625c660eb/42692979558.pdfIn PDF document text
    • http://gdwtechnology.com/fckeditor/file/mipigugerakotimu.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613a424ac7978---putawulepijaruvotelamino.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/161398f9edb93a---62654063462.pdfIn PDF document text
    • http://mariopresto.pl/userfiles/file/jonodabiditomavugimapewu.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ace1df3fd6---11205771542.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/derowoka.pdfIn PDF document text
    • https://kiaavcilar.com/upload/ckfinder/files/kugerowuvumonufegomixifa.pdfIn PDF document text
    • https://euforbiabulgaria.gbinvest.net/uploads/pages/files/zulesilavemidik.pdfIn PDF document text
    • https://drhuanghair.com/uploads/files/202109042055388900.pdfIn PDF document text
    • http://homeopathyhongkong.cn/files/18750880633.pdfIn PDF document text
    • http://turbotechnik24.de/userfiles/file/bimil.pdfIn PDF document text
    • http://www.radio-kum.si/data/files/44981224541.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/ea518851bbca3a1ed175ef5a1cfe46e5/86726383719.pdfIn PDF document text
    • http://dawahcity.com/userfiles/file/nejimoweriwediwume.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/161348e95b16f2---mowuxutulo.pdfIn PDF document text
    • http://obraz-tlt.ru/userfiles/file/kotegirulegoloja.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=sd+card+use+as+internal+memoryPDF 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_off0000ddda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDDA 10820 bytes
SHA-256: b84084a1aafb5e016e79e67753dbf756003aeff08fb98ff70b3c8ef09b7d245b
font_01_sfnt_off0000f6cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010edd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EDD 17872 bytes
SHA-256: 046367b47dc1e1280dcd1d2aed353ce76ff63656ed820a3e6ced33d7c25a7097

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