Malicious PDF — malware analysis report

Static analysis result for SHA-256 17aac7d2ab143ef6…

MALICIOUS

PDF

68.6 KB Created: 2021-09-30 21:08:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e0537bd86b2a2b8605d9f92cb4617b98 SHA-1: 5e27dc9c6cac359c314750db66d1bd31c315495a SHA-256: 17aac7d2ab143ef69cbcc19fc7513b2950f676442f732108664d3b4b09e0942d
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. The file contains numerous links to compromised websites, including those hosted on disposable domains and WordPress upload directories, suggesting a phishing or malware distribution campaign. The presence of external URIs and link farms indicates an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 https://pistant.ru/uplcv?utm_term=download+ezcast+apk PDF link annotation
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/161351b07acb88---putavab.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16131d4c2eb407---25488473494.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145b4cd24532---22312524491.pdfIn PDF document text
    • https://creativetalentnetwork.com/ckfinder/userfiles/files/mubawobolavakad.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613f63daae762---56125388778.pdfIn PDF document text
    • http://www.psoealora.es/ckfinder/userfiles/files/pagaline.pdfIn PDF document text
    • http://debeight.net/UserFiles/File/jurimigove.pdfIn PDF document text
    • https://godahoian.com/app/webroot/upload/files/jovatinuzinitogorudewel.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613390a223ab5---38395150429.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16132563230ffb---65803574128.pdfIn PDF document text
    • http://indah-education.nl/userfiles/file/rojisiwe.pdfIn PDF document text
    • http://birdwatching.sk/media/file/94002562382.pdfIn PDF document text
    • http://kingkady.cn/uploadfile/files/vuriguba.pdfIn PDF document text
    • http://www.tecnobor.com/ckfinder/userfiles/files/nizojubonite.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/a7c51083f80c50f839103f5ead10c1d0/18639795405.pdfIn PDF document text
    • http://ksiclubcom.ksiclub.org/svnprojects/DHD/Source/images/files/kagewo.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/161415f0b9268d---gezilibaxedogimaxoniguxil.pdfIn PDF document text
    • http://idominjazz.com/fckeditor/userfiles/image/38545012636.pdfIn PDF document text
    • http://oprandi.it/userfiles/files/fobunujarevosuwotikudobu.pdfIn PDF document text
    • http://hy-sf.com/admin/upimg/file///71150890027.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/80308025115.pdfIn PDF document text
    • http://realcomfort.ru/content/upload/file/tutek.pdfIn PDF document text
    • http://sql110.com/pic/30412588926.pdfIn PDF document text
    • http://lj-group.cn/upload/files/teven.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_off0000b0c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0C9 10556 bytes
SHA-256: 941f5247d3989c9a1edf0db25f37225972f806205427df7ff8142e19aabfe38f
font_01_sfnt_off0000c91b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC91B 14368 bytes
SHA-256: a2e6bea9af4ee843656a6536a88de536a362075a39c08d08be1f4ff4b127daaf
font_02_sfnt_off0000ecfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECFB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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