Malicious PDF — malware analysis report

Static analysis result for SHA-256 348f68b90534f0df…

MALICIOUS

PDF

97.4 KB Created: 2021-08-20 10:20:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: acefd9e3e44de2b75943b1aaa14836ad SHA-1: dac42bfc1f4f3967563b6bfc3d2eef651e74cf52 SHA-256: 348f68b90534f0df0c4f7699dad99735107a8b2c2025f5bd5d49fef8262f8f5a
96 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm or SEO spamming operation. The ML classifier also strongly indicated maliciousness. The document body was unreadable, but the heuristic firings and extensive URL list are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://archism.ru/uplcv?utm_term=sony+xplod+best+equalizer+settings PDF link annotation
    • https://somogyplusz.hu/files/kuzazolidepajosexejudis.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/sn4i6mf7p2lh4s6gtjbuc1vn3u/rajagosovarupap.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/98127139845.pdfIn PDF document text
    • http://quaretti.it/userfiles/files/61392184058.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/320ebca10b2db2657520e36d314ff6c1/tefaf.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1853284d0---jukexilolutuna.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c7a5d7b06af---tofuwubob.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f470ced7cdd---25744099213.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae14035a591---takimenusujiwujefebiri.pdfIn PDF document text
    • http://thelonerangerfanclub.com/ckfinder/userfiles/files/98459530955.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16079cdc8b1e4e---moxixat.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/7b9922a25897455d726d9b290241eee8/71439855904.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/3f421c70e66da3d64005e1ac9f2f50ef/nizunisaxedirowefawo.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/uos2rd7iho4rpp677ikn8023i3/55487027597.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/fsbbf1e533nhvime8lkvbn1lc4/rimutelomikirek.pdfIn PDF document text
    • https://anitacalderon.com/ckfinder/userfiles/files/selisulabevevepisiwofide.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/jizudubipigajaluneref.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/6tdoqos9ctc01rba19trjn6ol7/laxikijo.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/e4ab824331acc6dde6e557b535430f82/nelasupo.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/20217291534443997.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/52daa74910f9d1d5b3b4f107c80c77b4/vurid.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/49a80a4d6bc77f8a9adaa142bc571925/11976922052.pdfIn PDF document text
    • http://veterina-hrib.cz/user-uploads/files/nowadugumigub.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/kgjeb8059nqtreb33dkbfpugmn/kiritoferebozutaf.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_off00011762.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11762 17136 bytes
SHA-256: d34212ddf78dc3bcf579a43297b8314e94013be84c8fba27cd22671b77fb78e8
font_01_sfnt_off00014434.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14434 11304 bytes
SHA-256: 486b7a8758eedec1bfdca9dce806d7f578da02dc8a4292efe517b968607bfc56
font_02_sfnt_off00015e3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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