Malicious PDF — malware analysis report

Static analysis result for SHA-256 11d75b419402a24f…

MALICIOUS

PDF

91.6 KB Created: 2021-08-09 12:31:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f66736621334166259618042c5b1a48b SHA-1: 7dfb44c9fa9ff21019a48ed53efba19b55a806c9 SHA-256: 11d75b419402a24fdbdc25fda2e87935847491702fa3bb91c6ed7915a2fe86f3
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by an ML classifier as malicious and contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting. These URLs likely serve as a link farm to redirect users to malicious content, potentially for phishing or malware distribution. The presence of these links and the ML detection strongly suggest a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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=telemundo+novelas+cennet+capitulo+51
    • http://fsgpj.com/upfolder/e/files/20210624100239.pdf
    • http://onestep-tokyo.com/userfiles/file/24594691938.pdf
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/67666b78bd539d59746857f85a1874b8/bumesisudokutazemi.pdf
    • https://dlt-nkp.com/fileupload//file/59223065944.pdf
    • http://travellerisland.com/files/66858942085.pdf
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f94d29daf49---76706284014.pdf
    • https://davaocarrental.com/images/file/39208285136.pdf
    • https://sgpropertylawyers.com/wp-content/plugins/super-forms/uploads/php/files/4ae2b0674e92455c81bad2fd8a3209e5/gugesofop.pdf
    • http://accessprecision.com/userfiles/file/mupimolupetigupesabu.pdf
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/dc7118fbb9094a8c2c4f9d048b698b7b/gunovakavilubupomelezoke.pdf
    • http://kpdb.org/userfiles/files/zenigifiteromazoz.pdf
    • http://abwpetersburg.com/uploads/files/venerofox.pdf
    • https://coolingrealestate.com/your-home-cleaner/FCKuploads/file/temebe.pdf
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16104a2d75be27---19612611501.pdf
    • http://haniltm.kr/upfiles/editor/files/vujod.pdf
    • http://gospel-pour-100-voix.com/fichiers/newsletter/file/85878414838.pdf
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/1382tupjo5ke9q2jgc7s5t1f38/26610439263.pdf
    • http://skogsformedling.se/bilder_umeny/File/riguwemosepiwira.pdf
    • https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd190283dd---9708757231.pdf
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081a265367e6---76849953044.pdf
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f7fcc87a41b---vifuviwisosogupefi.pdf
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/40e9ed3b1b753c66918dfee7a6c66900/97681572636.pdf
    • http://elturo.ru/img/upload/files/kasiriponorerabunoxifagaz.pdf
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe9e62bc7d---34604793906.pdf
    • 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_off0000fa4f.bin
a47db8011298d1794f29e8473de4334f850fac2b4353a903fa9e96f7f67f2ef3
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA4F 20512 bytes
font_01_sfnt_off00012d67.bin
e77f4d9cc02a51a7671c85bf0079dc74d4fce4bd292fb61d2e0ec2634663fe52
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D67 10888 bytes
font_02_sfnt_off000146b0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x146B0 16792 bytes