Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd519a5e0ba8fd72…

MALICIOUS

PDF

84.7 KB Created: 2021-07-14 01:16:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fbbc4b2ccfd91e7ed0399b7aa177a347 SHA-1: 5be85c543352ae46abec5dc0895b59839883e4c3 SHA-256: cd519a5e0ba8fd7270a8d06ce70705faff532f77a9f719551ffe1a5640c49c56
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1204.002 Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It contains numerous embedded URIs pointing to compromised WordPress sites and disposable domains, suggesting a phishing or malware distribution campaign. The presence of these links indicates the document's primary function is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://smidgel.ru/uplcv?utm_term=marvin+gaye+song+in+baby+boy PDF link annotation
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/fc6ba394b4096e421976122ddb8d4039/retavenanuxu.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a8a85a8af06---kikagebokakanalixivanapo.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/b08ed8ac02ad1be4a05f947f98f3f83e/lijosexotuwunotesa.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c998a4b7db---80461250795.pdfPDF link annotation
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/88f6adcc8fb664c9175fd6ff770e2c1b/zazoduwibobefebojafo.pdfIn PDF document text
    • http://seoulmenu.com/uploads/files/63514176943.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/7f6f9dfc138da982b06667537575af76/pozizitibepifol.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160841d747d37a---64336479374.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20210706074606117.pdfIn PDF document text
    • http://sequirk.ie/userfiles/file/jexiwinejedesafexabazage.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092475443afe---98046004694.pdfIn PDF document text
    • http://eraucheta.ru/uploads/file/23113948043.pdfIn PDF document text
    • https://travelstore.tn/userfiles/file/vumonezi.pdfIn PDF document text
    • http://morgancountyoh.com/userimages/31814132498.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bf7efb4bb70---86608860046.pdfIn PDF document text
    • https://eberli-medical-supply.ch/upload/file/nawafexewiveravivu.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/5biqg8kv2h6ao6k1aqin1snav6/87672583145.pdfIn PDF document text
    • http://alompar.hu/uploads/content_files/files/17275063775.pdfIn PDF document text
    • https://binarbaidtrading.com/public_html/userfiles/file/majaxam.pdfIn PDF document text
    • https://susta.vn/userfiles/file/6697941262.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160986d7c32cbd---duziraga.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/futenofufuf.pdfIn PDF document text
    • http://d4smontreal.com/clients/f/f5/f58105ca183540932673f5bf18e62671/File/83858349291.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_off0000e97d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE97D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010194.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10194 10452 bytes
SHA-256: 009f490f79364c913a6b9c75b9da516f294e86eb9782bede73d30aaf91af77bd
font_02_sfnt_off00011970.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11970 17016 bytes
SHA-256: 19b9831c8b0a96a75d446f410f9b4db3c385ac78a8af351e7e47284b6580d7c2

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