Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbe26e2610e13783…

MALICIOUS

PDF

80.4 KB Created: 2021-09-14 17:22:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ed773aa8a6d06944fa3dfa685a4a85ab SHA-1: 0a700d97247684c37665a4ca37b9956bbfb59e84 SHA-256: bbe26e2610e1378354d60b801ad02e6f4932682e015602e6f7313f4d4a592026
96 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious, and the presence of external URIs and link farm heuristics confirms a high likelihood of phishing or malware distribution. No scripts were extracted, but the document's structure and embedded links are sufficient to infer its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://ketchas.ru/uplcv?utm_term=change+phone+password+android PDF link annotation
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613789c0c4cb3---97778653461.pdfIn PDF document text
    • http://simonhoirup.dk/userfiles/file/87238281459.pdfIn PDF document text
    • http://webbyshoe.com/fckeditor/userfiles/file/dalavusoxuxasajewiv.pdfIn PDF document text
    • http://boracayg.com/FileData/ckfinder/files/20210904_12838C0EC417B450.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/b9caac836b3bdccb5146af17ceca699d/80831643175.pdfIn PDF document text
    • http://ukonlinedirect.com/userfiles/files/daxikuxom.pdfIn PDF document text
    • http://filippodelvita.com/demo/userfiles/file/lasopo.pdfIn PDF document text
    • http://licausi.it/userfiles/files/31021961708.pdfIn PDF document text
    • http://hauptlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/remixenakebevuvavine.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613035611914a---fuvatelifawazepega.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/fenawitojivusakededi.pdfIn PDF document text
    • https://ubitanduk.com/contents/files/42254112144.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613274eb043f2---volaxujanali.pdfIn PDF document text
    • https://easypayindia.in/userfiles/file/raxokapunilediwopopuw.pdfIn PDF document text
    • http://hidramaco.com/files/files/verazirisupupa.pdfIn PDF document text
    • https://ensegun2.com/ckfinder/userfiles/files/kadoxojobusadobitux.pdfIn PDF document text
    • http://pokwuttibut.com/file_media/file_image/file/lutuzomeligenusuzosik.pdfIn PDF document text
    • http://computergramm.com/userfiles/file/83877992379.pdfIn PDF document text
    • http://dighakanchaninternational.com/FCKeditor/file/43133583302.pdfIn PDF document text
    • http://blackhorsesc.pl/userfiles/file/naxapugapalurekodid.pdfIn PDF document text
    • http://vicc.huh.hu/UserFiles/File/92238830924.pdfIn PDF document text
    • http://boxshop.mn/userfiles/files/kedugomom.pdfIn PDF document text
    • 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_off0000d5c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5C0 10644 bytes
SHA-256: 10089381216463f225844f500d35baddd81389b0333ff0aa60a608565f55dc30
font_01_sfnt_off0000ede9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000105fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105FB 17976 bytes
SHA-256: 42e27651f4014222e026dde74abae42171325784b9c422eed25419ca9a1d0adf