Malicious PDF — malware analysis report

Static analysis result for SHA-256 c190929f1495d0dd…

MALICIOUS

PDF

95.0 KB Created: 2021-07-17 16:34:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: c761ce2c2859d82ca08e6c1dc66bc49a SHA-1: b79e845275db57935d00084cfb28b96d9c79c39b SHA-256: c190929f1495d0dd6eab58cec8ed9881b53a634dff74ec6d294eba9e6108e819
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also exhibits characteristics of a link farm, with numerous URLs pointing to potentially compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/c87b66bf6612afd9464f43c82d3b96ca/sisudozavilama.pdf In PDF document text
    • http://dralituncer.net/userfiles/file/ximevojenokisumatugab.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/cc9eb10fa39dc09c93ed53bacd7dee68/75499652443.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/l5ajrnqoshecjhvnt24ai4sqj2/vovixotesokokapegewow.pdfIn PDF document text
    • http://kaztelcom.kz/ckfinder/userfiles/files/60105676560.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/54e6198021d371c834ebc0670f552e02/jirogujelizubure.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdaf22014cf---rimimasepegikuxovalineb.pdfIn PDF document text
    • http://mywayrtk.info/userfiles/file/93108131883.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/wekivasuru.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/25892763643.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8099d6aef---kekofozizowapub.pdfIn PDF document text
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/222a569b079e8560e329cdb130683d66/godobumiwatekipu.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16084c9a484d60---xizuwono.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/ejo0akisebrf09hfrn5grnk1ie/lorubaj.pdfIn PDF document text
    • http://qytbearing.com/upfile/file/23860112911.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/41673679050.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/jsi02bg9oivfllso6c3nj5josd/46950653515.pdfIn PDF document text
    • http://ashioke.com/images/library/File/8259811214.pdfIn PDF document text
    • https://celebicatering.com/upload/ckfinder/files/kuleruzekal.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/fe7tg5i2klsnrjgpnttn7oolv5/sozatoraleminepev.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f86937d6ce---falexanujus.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/loluto.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/870e1fd81ed0628ed7cabcf1e0466678/begudikimejotuk.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/bf4dde74157dbafba654ffa4ccc58aad/60289697830.pdfIn PDF document text
    • http://arserwood.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210619050133876506k72t1h.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=exercise+to+reduce+arm+fatPDF 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_off00011226.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11226 10672 bytes
SHA-256: 07b83061f2f85e000f12a8c3ef18cc649c194035848ee3c9fbdf1893c881da8f
font_01_sfnt_off00012ab0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AB0 16852 bytes
SHA-256: 863b3bb1584941648701bc503e9b70034f7198700303d682c042bf800980d4df
font_02_sfnt_off000156a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1