Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbd1200bfe503d34…

MALICIOUS

PDF

81.6 KB Created: 2021-09-02 05:53:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4269e22e96aebca60b3cf028c58c55df SHA-1: 68f8801e4cd0cbf349b2382cf7e1e6f7ac1cdb8a SHA-256: fbd1200bfe503d34a98f713c73d0c051d482ba10648557ba13746c9be2051812
96 Risk Score

Malware Insights

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

The ML classifier strongly indicated maliciousness, and multiple heuristics identified the PDF as a link farm. It contains numerous URLs pointing to compromised WordPress sites and other domains, likely intended to manipulate search engine results or lead users to malicious content. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://grandegroup.net/files/gazoseb.pdf In PDF document text
    • http://lowry-averyreunion.com/clients/c/c0/c0e4e7922159a76f956c19110b7bfeb7/File/vojutawojidaluvedixogiso.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4f8abd314---tifididafozilewumeje.pdfIn PDF document text
    • http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/69445696972.pdfIn PDF document text
    • https://esportenerd.com/app/webroot/ckfinder/userfiles/files/1006274421.pdfIn PDF document text
    • http://jcon-aps.dk/userfiles/file/kosebexovugeka.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/rnoevsl20f1epg6tte0c36k8fo/64222152744.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbd1a52c76---zopukugugorifavileteb.pdfIn PDF document text
    • https://kasihjp.com/contents//files/13176456065.pdfIn PDF document text
    • http://gabortech.com/admin/file/falamomig.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/pilaze.pdfIn PDF document text
    • http://sy-smile.com/upload/files/poxano.pdfIn PDF document text
    • http://www.siscbolivia.com/admin/uploaded/fck/file/defefujakaseme.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cf67316adf8---jatetigudebuxo.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/e5b77577edcc6caa60fe362375958297/53878012940.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6a6894df0b---99951987366.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091abd378f4b---jizijukifupulibupe.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071f6a8182c6---moxovipefigofiwerujup.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f976ecdbe93---talep.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/lewamitidesu.pdfIn PDF document text
    • http://kimbuunguyen.com/uploads/userfiles/file/kefuregudexivuv.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/319420142d86e65f6f2ab533c164dbaf/66198746211.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=convert+pdf+to+another+formatPDF 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_off0000d9d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1EB 10552 bytes
SHA-256: 56165ddd45bd0c2f06faede5ce257d666d6b9265c2abf1799ff8e826f9815b89
font_02_sfnt_off000109ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109CE 17988 bytes
SHA-256: c74907e7f3dd01d8feeae73251e5b257ef77d1ddd0398416d6c6f4e65b418e31

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