Malicious PDF — malware analysis report

Static analysis result for SHA-256 37f4377f6fcf5e58…

MALICIOUS

PDF

87.5 KB Created: 2021-07-21 00:30:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 8d2aa02316b47f37364e51ab92056c06 SHA-1: 3f173af7b8ba4c50a678e8d504f78d855eaa6152 SHA-256: 37f4377f6fcf5e582b1e976be7a6c167ad9221c8a4099d7cb42bfbab38828546
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The ML classifier strongly indicates maliciousness, and the presence of these links suggests an attempt to redirect users to malicious content or phishing sites. No scripts were extracted, but the link farm structure is a common lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/d76ef4fb52db923ee39ffa61bd301805/podaxen.pdf In PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/18582708ff55a673f2ae0fe5a5571cf8/78749462703.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/1f1c6dfa82f45b26f8e23714bfdea8a5/dovexolumuvurupazume.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/1nreliu1qnvusjph1atlo7c8u4/kufexoxesuwezasajujite.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/rarezabepato.pdfIn PDF document text
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/14478044879.pdfIn PDF document text
    • https://alubiasdetolosa.com/files/galeria/files/70610404442.pdfIn PDF document text
    • http://caf-ljubljana.si/docs/72403925203.pdfIn PDF document text
    • http://struttur-arch.it/userfiles/files/65653800750.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/14b9b43f37641583605d0252397a6a99/3332161952.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac4fe747902---40521004506.pdfIn PDF document text
    • https://bczenekar.hu/files/file/movilokulinisikubezuwabi.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/5911745030b5674359723d7b7405d7df/36842405461.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1607c38bc4304a---52703621843.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/5aa32100f30fb90c1da83ab475986f54/55269408679.pdfIn PDF document text
    • https://organicfertilizerproduction.com/d/files/divipezefaxode.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609c0ff3d12e7---zelutomufajowejigutimuw.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/88066880349.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1607a46123e7c6---sosozatuwododokokag.pdfIn PDF document text
    • http://toddfamilyreunion.com/clients/4/48/482e924d5a052aa4a0c13eb8a30e0bc8/File/masikavuvowepugaroziv.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/qf3ukacqul53cl0kqjrhk0btg5/dozowarovesadinuw.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/37284858146.pdfIn PDF document text
    • http://zimmerei-possert.at/futefuxojup.pdfIn PDF document text
    • http://ivankotov.ru/img/lib/file/28617309350.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606ceecd287ce---72674983952.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=watch+no+strings+attached+online+free+putlockersPDF 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_off0000f015.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF015 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010827.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10827 17888 bytes
SHA-256: f2017aa88bdde19c1497638a95ddafb94b2807214f1597c3124be3dbce8b1236
font_02_sfnt_off00013702.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13702 11084 bytes
SHA-256: 7128ae01e67e94389b0b12c4a79a269d252f8ea9fdf528b8793c7cbd3aa05cbb

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