Malicious PDF — malware analysis report

Static analysis result for SHA-256 076a8977eb18a34a…

MALICIOUS

PDF

80.4 KB Created: 2021-08-11 08:38:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 4e56baff7960d7d242e40646af509c7f SHA-1: c9faaa607dc3c418e4fbd8a3f551586d3c0e2db2 SHA-256: 076a8977eb18a34a7bb791fdb17cc6576bc0b8bdd5938702d3955e5407573fa3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features a large number of external links, many pointing to compromised websites or disposable hosting, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://turismo-galicia.es/ckfinder/userfiles/files/davojokuvazim.pdf In PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/i6kk3tmtpe9819etq6vlhgmvc8/35121241764.pdfIn PDF document text
    • http://arredamentoambienti.it/img/file/vedamadur.pdfIn PDF document text
    • http://yeosingol.com/FileData/ckfinder/files/20210624_7DD8A98CF6086873.pdfIn PDF document text
    • http://deepakbatteries.com/uploads/file/roxegoruridaniw.pdfIn PDF document text
    • http://aodaiminhhanh.com/app/webroot/uploads/files/21267184896.pdfIn PDF document text
    • http://hanasushipickup.com/uploads/files/vijiluwoka.pdfIn PDF document text
    • http://www.77ice.com/upload/files/bewasatizenovoviwez.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160af8667909b2---50016956844.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/78mm64nfm5uujvaj1f46ajgd5i/23033127577.pdfIn PDF document text
    • https://mangonebike.com/uploads/file/katekerekiranevoworalage.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/jadaku.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/fd79d1a5dbb8876369adccfed27e6fd1/51832924091.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/58f26cac7f39767f79e1479d88e43016/komikoxuba.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/u0pi30bg6c37dhd75sbrfdfno3/1192672922.pdfIn PDF document text
    • http://viacaosaopedro.com/www/js/ckfinder/userfiles/files/78344774570.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dbce43321d7---80779137033.pdfIn PDF document text
    • http://girc.ncue.edu.tw/ckfinder/ckfiles/files/majigozupijosanimuzo.pdfIn PDF document text
    • http://preserveproperties.com/userfiles/files/zonukuzapuwug.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/0b8873fc37222af3cc013d92a9fb05a8/vumad.pdfIn PDF document text
    • https://stopserv.ru/files/file/59074319556.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/eaa0220d8ed837076fb28df400225214/tululebaroduvuxokirifet.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160ac5e41e4698---19384621420.pdfIn PDF document text
    • http://fapannimario.it/userfiles/files/niroxezatiboko.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/16113000360f36---21734460475.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/nejue78ke8fslsmqso0elmlbrv/74935352029.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=texte+%C3%A0+copier+ce1+ce2PDF 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_off0000d4d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D0 10308 bytes
SHA-256: 36c90120d38520f266b596437f7904f7bbe571390aeae8fdffc28df657a564f5
font_01_sfnt_off0000ec51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010463.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10463 18212 bytes
SHA-256: fb34ac23036bbbb49672b66d0785e4e81253bfd4b480a524fc9c736de2f7df75