Malicious PDF — malware analysis report

Static analysis result for SHA-256 de1f060a17f53306…

MALICIOUS

PDF

82.1 KB Created: 2021-08-23 10:23:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7e41a038670c8daf685f89aa7839bdb1 SHA-1: 1f591fdb84c7571f4e61bc5e9b5ffd6ebdfae062 SHA-256: de1f060a17f533068c98458154d939f90ecf9d0ef55d23903e5d796e4fff2553
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm with numerous URLs pointing to compromised CMS upload storage, indicating a likely attempt to redirect users to malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious link farm. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/01b3f7c2aa11d8060630dd3c90354d76/funokegapugi.pdf In PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16116884328683---ranolujeduluwopasulotad.pdfIn PDF document text
    • http://shahnawazonline.com/uploads/files/rizukakozepem.pdfIn PDF document text
    • http://eastendmediation.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pugipurunogudaxiz.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16092bf917a243---povuzadetine.pdfIn PDF document text
    • http://instant-image.net/UserFiles/Site/File/91882951748.pdfIn PDF document text
    • http://yesilderecine.com/admin/editor_resim/file/lirebefume.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/sapiruzorovofe.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/70703267864.pdfIn PDF document text
    • http://mariopresto.pl/userfiles/file/86506510702.pdfIn PDF document text
    • http://fruhmann-elektrotechnik.at/tiziwezidaj.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c546b98a7b0---wakagavexenita.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/44994813792.pdfIn PDF document text
    • https://hideab.se/tc/Mediagalleri/file/lumelenudurobig.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160816d80053a2---8748122774.pdfIn PDF document text
    • http://av-jet.ru/userfiles/file/komakaj.pdfIn PDF document text
    • http://adamslakeband.org/userfiles/file/43304952927.pdfIn PDF document text
    • http://coeb.eu/userfiles/files/42246412115.pdfIn PDF document text
    • http://randoquad72.fr/userfiles/file/20856473636.pdfIn PDF document text
    • http://ambvetfanini.eu/userfiles/files/zeluxeporosu.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/1fe8955419774c6282dc4b9c33b2a963/sifasegib.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/27613046892.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/godozunoniruwafup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=types+of+research+pptPDF 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_off0000df49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f760.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF760 10412 bytes
SHA-256: e84bbfab2c6407916c637adef4da1fe9b9143eced3b4246876524964f7fe88ab
font_02_sfnt_off00010f32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F32 16244 bytes
SHA-256: d863a1f69fb4f60fb7ed11983ba7636ee52a6835a33ff72d33a83615c4fe555b