Malicious PDF — malware analysis report

Static analysis result for SHA-256 88d0db0b90f6049b…

MALICIOUS

PDF

113.3 KB Created: 2021-06-25 16:07:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 22e46386fa5071ae1218ef59e1f4de5c SHA-1: ccb6e7ae5ad5b78a21d6c9d5668fe816842449b2 SHA-256: 88d0db0b90f6049b53b7ce1bec8830da788f1dbc9d9a7a0c6ba8f1498941d7b3
96 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to multiple compromised CMS upload directories, suggesting an attempt to distribute further malicious content. The ML classifier strongly indicated maliciousness, and the structure aligns with a spearphishing attachment used to lure victims to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1b712e89ee---82145680658.pdf
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/720d9d42aac42c0a3dc48f1ac2755651/siwubafiguwikewu.pdf
    • https://www.deuba.info/wp-content/plugins/super-forms/uploads/php/files/8dq68rt2p4710vmeghneu3m99m/dijaz.pdf
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079bb1b96ccf---fitos.pdf
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/aa4484566e45bf19243ca7674c8d8c0f/74123428117.pdf
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/kn5c37a1e002a7v5ec4tuu37g4/67585599355.pdf
    • https://cuisinescartier.ca/upload/editor/file/47055021242.pdf
    • https://cristalensi.com/public/File/mapan.pdf
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/c344c3ecc96a68b0054c90b030e86e3d/48406308035.pdf
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/e13bafccf04f64fe40ebaafb802a89f6/nolozutiku.pdf
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/7j8e7doevsutbo9geplhtcobj8/79262934922.pdf
    • http://canphantich.net/Images_upload/files/2059811590.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a7c739214---rekijosaxuzopaguze.pdf
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1609ddf0914f38---baxupigusidetaxo.pdf
    • http://abpaluso.com/upload/file/ferudurovimenug.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=at+one+altar
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000155de.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x155DE 16792 bytes
font_01_sfnt_off00016df4.bin
ce99ef497f263b3097259ce6957df7c6a596b64aed7a6a542e1745a955649681		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16DF4 9824 bytes
font_02_sfnt_off000183a8.bin
7803a773db1aa3e2cbc953c447411ad1a191d605fa3b4dd4eaf23b428c8b68a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x183A8 20424 bytes

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