Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ac9e03bc8a034fe…

MALICIOUS

PDF

92.3 KB Created: 2021-07-28 13:37:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 77e301289795db6d343c75decaa640b4 SHA-1: 380fd224677a0b3ed76ca610557630e4cb7d611a SHA-256: 1ac9e03bc8a034fe4bf39cc261967e2eeb9a6f54ae1cbd7e841d4f9b78e705cc
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. Heuristics identified it as a link farm hosted on compromised CMS uploads and disposable hosting, likely designed to redirect users to malicious sites. The embedded URLs, such as http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160834608267f1---93628070328.pdf, are strong indicators of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/a5m85r020e3n02lsq9vku67eh2/558602595.pdf In PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099dfee7f350---59720460083.pdfIn PDF document text
    • http://fabtur.ru/upload/files/wepukitimunanuzazadexon.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160834608267f1---93628070328.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab9218ab7cc---jewafuzove.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/luturotetelakexo.pdfIn PDF document text
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/58584929167.pdfIn PDF document text
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc344e7496---bugijixolewemefurib.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/safj8q56usojb7u0gj0qiffr1a/puvinarugutib.pdfIn PDF document text
    • https://textolinguisticsolutions.com/upload/editor/file/girevaforojiro.pdfIn PDF document text
    • http://pokewaveanaheim.com/uploads/files/rujerurokadaxogokozokem.pdfIn PDF document text
    • https://armenia4d.com/contents//files/86641181163.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/t86lnruo9j0kk9248uvoi0upv3/21194750699.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9459e8bacdf386c6d2b40190f19b13e3/gebuninarobiripodug.pdfIn PDF document text
    • http://lhs75aa.org/clients/0/08/08eb77d093c5251d787cf05842b4a73c/File/sedelipimuzizebad.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ffd765a9bf---tovajipo.pdfIn PDF document text
    • http://kalikraft.com/images/file/11578793836.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ff1be2b2ba2---wamonesarekazadijekukopi.pdfIn PDF document text
    • http://cathugo.de/res/wysiwyg/file/wulabunixekuxavipo.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/mivuribu.pdfIn PDF document text
    • http://jaatkinson.com/userimages/kogonogajebo.pdfIn PDF document text
    • http://pwmtqatar.net/userfiles/file/nuniduvesapowisane.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=keto+lose+weight+fast+meal+planPDF 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_off000104bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104BD 10780 bytes
SHA-256: 1d16acdff4cb43913bb8fe77c9328edaf161f4ecdca89d66bf2a4e0e2a35e81b
font_01_sfnt_off00011d78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D78 17116 bytes
SHA-256: af41be69d07a3b87aced62a7fdf8df2a8b7f54e64c2e926d0ef3f11d95585e9d
font_02_sfnt_off000149f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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