Malicious PDF — malware analysis report

Static analysis result for SHA-256 4eb991a1af69c9a0…

MALICIOUS

PDF

88.4 KB Created: 2021-08-16 23:44:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 41bb01db3132ff3cc4d8f727d4c6594a SHA-1: 96a6aa581d199ccaacb793b897a8cf4610f9c5c6 SHA-256: 4eb991a1af69c9a0a207bdc1ef6e3ff7f98aee14d6151d1117c92fa4d65dab04
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a significant number of external links, many hosted on compromised CMS uploads and disposable domains, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 6

  • 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.
  • 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://jandenzobv.com/image_uploads/file/63319970645.pdf In PDF document text
    • https://kaptenhoki.net/contents//files/dogabujodopabegudof.pdfIn PDF document text
    • https://esterkins.de/ckfinder/userfiles/files/13567630121.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/dad54524758908b425f9bea37b785d0d/55067625264.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/v62bktnnnclh9fu37kosh9nll0/66497895316.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070df4bee150---34009314941.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080fb20a9561---nafuragelesefelulore.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e463957ba---5859263270.pdfIn PDF document text
    • https://mttrasportisrl.it/dati/upload/file/kofak.pdfIn PDF document text
    • http://perseverance.cyou/updatefiles/file/749546438.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/gilotilere.pdfIn PDF document text
    • http://colorfulmedia.de/fotki/fotki/file/napijomawagerekedinagaku.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/f67d622bc62efb92d0b62bde72db1bd4/karajudojulavo.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160824012a71c1---davepa.pdfIn PDF document text
    • http://bobmeetin.com/media/galleries/files/60106021089.pdfIn PDF document text
    • https://satybharat.com/ci/userfiles/files/vorikafudaz.pdfIn PDF document text
    • https://pavillonwohlen.ch/userfiles/files/zetivefodi.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/mafalojijufajabujaw.pdfIn PDF document text
    • http://cmuniontravel.com/userfiles/files/45268971545.pdfIn PDF document text
    • https://windsbs.biz/files/file/fasidudavodota.pdfIn PDF document text
    • http://blackwingsexpress.com/upload/userfiles/files/livoru.pdfIn PDF document text
    • https://viessmannboilers.ca/fck_upload/file/tevebinujuwifinuzaf.pdfIn PDF document text
    • https://pmsp-me.com/userfiles/files/45717589661.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=que+pobres+tan+ricos+capitulo+158+completoPDF 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://goo.gl/1KQQbOIn PDF document text
    • http://goo.gl/l5HZkDIn PDF document text
    • http://goo.gl/3G9n18In 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_off0000edd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD1 19724 bytes
SHA-256: 3e76a65bca31a88301b957600ee649a342b8605d3004d464ee4b0bb183b6a288
font_01_sfnt_off00011ec7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000136de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136DE 11228 bytes
SHA-256: 9320f51ab1fb12f3c5cdd274a6e4610780b233b94fa6c2d535d548ce166f2112

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