Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d18b46b8b73f6a3…

MALICIOUS

PDF

100.4 KB Created: 2021-09-05 03:09:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6d88896f78962a49c6a15451a99b31e7 SHA-1: 13ce2d76d7bfbf6359464310e901a1ef276b8c07 SHA-256: 9d18b46b8b73f6a3a8f035bf5930e32301da44b41b39d53e9ba3a7e8a57d19f5
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent. No scripts were extracted, so the primary attack vector appears to be the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://synerhu.ru/uplcv?utm_term=amnaya+mandaram+pdf PDF link annotation
    • https://yingzhaoliuart.com/upload/file/wedabiviraxuzijaritak.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a75f6d637ca---96289488133.pdfIn PDF document text
    • http://camberwelltaxi.com/survey/userfiles/files/sanogowagisumolijokeli.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/968151c6960ab5dc4cd1b4211e3f85e2/77507488546.pdfIn PDF document text
    • http://uk-finansist.ru/userfiles/file/20127828260.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/04328ac75618b3186f88191a3a9367db/divevupu.pdfIn PDF document text
    • http://i-harmonics.com/upload/files/98500651400.pdfIn PDF document text
    • http://bunny888.com/ckfinder/userfiles/files/26812650663.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/87cb2bbc3086fb08e8d90a41bf6d5836/99792238588.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/b4ed066bb0b58cf2ba2e3283296a0de0/80665158419.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609bf672813fb---wasafiwurodubitevegixes.pdfIn PDF document text
    • http://handinks.com/ckfinder/images_store/files/7537350897.pdfIn PDF document text
    • http://gamjagolla.com/uploads/files/69704163305.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/88239574030.pdfIn PDF document text
    • http://sonnenheizung.ch/fckeditor/editor/images/file/20163261466.pdfIn PDF document text
    • http://kiavysocina.cz/UserFiles/File/rorijubofaditolijo.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/rnr5i3fn9ag45f5hia3fcg27hp/sezur.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd9af35aa89---96724738734.pdfIn PDF document text
    • http://klinikoral.com/img/userfiles/files/97951718397.pdfIn PDF document text
    • http://driscollandgibson.com/images/edit_images/file/dofimotivaxigamikejagime.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16079dc3093a99---42734197358.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010a7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A7D 16564 bytes
SHA-256: 1edb39ea7f8c8b1c9d8062f59739a67966b4260a435c7796720d3d038c1f4215
font_01_sfnt_off000121c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121C2 19972 bytes
SHA-256: 046943453e05893cbeb5093e41c859d48f2061033bb735492e3b27867b77c095
font_02_sfnt_off000154e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00016d00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D00 10096 bytes
SHA-256: 0efb2e22e34ac382be607721f1b496d194db40ae5fa447767dc639473f4e1f42

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