Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbb031a258e236cb…

MALICIOUS

PDF

75.1 KB Created: 2021-06-27 07:33:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 51bce9d167281a5d51c805b3a4f7e973 SHA-1: e8e051a7302cac8cd930ff1980d074027d499680 SHA-256: bbb031a258e236cb2adb2ccf7911a66ec1a11e5b27b50d3618dd3e66911528a0
96 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content or phish users. The ML classifier strongly indicated maliciousness, and the structure aligns with a common technique for hosting malicious files on compromised infrastructure.

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 http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16081f9b3a929a---guwemitow.pdf In PDF document text
    • https://cuisinescartier.ca/upload/editor/file/lowoxuzuronofonijiwire.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1607e829867b2e---85833889906.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/gomovivumibava.pdfIn PDF document text
    • http://ncabhsa.com/clients/875427/File/72231576127.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/88103837263.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-1/20210501142440676053.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091d13318f05---57112091695.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/8e5bf0a16c1135fd51c973a73512c99f/84124820700.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/l73jh2voqdb8ee0lljmu79ukqb/wasitixodasadewogos.pdfIn PDF document text
    • http://velkoobchod-man.eu/ckfinder/userfiles/files/kizefutezosi.pdfIn PDF document text
    • https://guijek.com/userfiles/file/mojixixebiluvevixezo.pdfIn PDF document text
    • http://goddesshair.net/upload/users/files/67777889114.pdfIn PDF document text
    • http://dogninja.com/userfiles/files/55411007963.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/l6l9k1ocn3ela3b2t7c03141u5/nutedefer.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/9462b0001cfe1711af0c6158235aab5c/relosewexolojabor.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c54237bc8---bavolumebibojem.pdfIn PDF document text
    • https://traonguoc.vn/wp-content/plugins/super-forms/uploads/php/files/205lj5p0d1k3vl8httt4vi6g0i/1411929015.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/a360b5d177a107a6aec34bc6496d04cb/futepoduludexotavozodinar.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/3r71rmvkorf26acrkjtrgm3tgc/dorudafefokiwozo.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/8e97a7e8b49658745750fabdbef03f49/20206779017.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/9ul3le728fc0m9noo6vq3off3p/zekafetopudowojadarem.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086958d482a5---letamarisisubajamoze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=side+lunges+workoutPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070ff6d54764---83732887257.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_off0000c31e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC31E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB30 16940 bytes
SHA-256: 6890cb54c882a71e97102c5b7f08d116ba2d450ebbf8e57c4fae3d83aac05e8d
font_02_sfnt_off0001074e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1074E 10616 bytes
SHA-256: 25de185d74a17ec226f73bbb69bb633cb5a466a0f50e0126ff309d38d0f36dd1

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