Malicious PDF — malware analysis report

Static analysis result for SHA-256 72e1b1565e9a1e73…

MALICIOUS

PDF

82.4 KB Created: 2021-09-13 16:56:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 72610eb12097e606d300b84d8953892a SHA-1: bdbdb45390750521606a1ed271379d03d28d3fd3 SHA-256: 72e1b1565e9a1e736090f236c429ec3d35fe87857223fc9de8db55cf93344d3e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to disposable hosting or compromised CMS uploads, forming a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution by redirecting users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • 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.
  • 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://gencshoworganizasyon.com/upload/ckfinder/files/xoxagajokejadaguneku.pdf In PDF document text
    • http://stsmcc.org/www/js/ckfinder/userfiles/files/movupizororozimit.pdfIn PDF document text
    • http://gzmzwl.com/Uploadfiles/files/26783197145.pdfIn PDF document text
    • http://nanouklid.cz/upload/file/58617836778.pdfIn PDF document text
    • http://templeton.sk/userfiles/file/45793732279.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/54ce6c667129f7f748d06e3551790f14/tufezal.pdfIn PDF document text
    • http://dongkoo.com/uploads/editor/files/bibebifodevubosobixe.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/94557256878.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/161329b40e4964---91742030639.pdfIn PDF document text
    • http://humidorio.de/ckfinder/userfiles/files/wefilirabelogadu.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/tp8ur6a46r2273q31ld2qlh4n0/81660655221.pdfIn PDF document text
    • https://zegaoyun.com/calisma2/files/uploads/39179962704.pdfIn PDF document text
    • http://awarelaxcentrum.cz/user_files/file/nomiwezuvij.pdfIn PDF document text
    • http://goldstecq.com/userfiles/file/pixijosozezuboguge.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/ddf51aafd083c70ccbfa9e22686262d0/99485616095.pdfIn PDF document text
    • http://konditsionery-reutov.ru/upload_picture/file/sebixujepawub.pdfIn PDF document text
    • https://xn--z4qq44i.tw/upload/actfiles/zezusikezukez.pdfIn PDF document text
    • https://autopsrus.com/ckfinder/userfiles/files/jawimigonavopesakuzunoj.pdfIn PDF document text
    • http://haiphongcontest.com/images/files/34251950377.pdfIn PDF document text
    • http://bradhelferlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xukibimobakolon.pdfIn PDF document text
    • http://szzxwx.com/Upload/Upload/file/2021921151224775.pdfIn PDF document text
    • http://jiehuist.com/userfiles/files/dinosexe.pdfIn PDF document text
    • http://ipmarketing.net/FCKeditor/editor/filemanager/connectors/userfiles/file/pexuxawi.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/sibuzo.pdfIn PDF document text
    • http://cuacuonnhanh.vn/Images_upload/files/faboxikesekivu.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/vubatekumekidowute.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=super+parental+guardians+full+movie+123moviesPDF 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_off0000db04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB04 17684 bytes
SHA-256: 3204bbcd1bd7f8975004c2ed86fa04b6ea7a50ccbd5353d55d1e31dabf332176
font_01_sfnt_off000108f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F1 11428 bytes
SHA-256: daa4cbc261520770a3107ef8276129aba2c5a9224649eecee420b64bd19cfac5
font_02_sfnt_off000123ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1