Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ed98a861828f12d…

MALICIOUS

PDF

71.1 KB Created: 2021-09-28 03:38:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: cd046eee69695935e8959f0d65ba4750 SHA-1: 138559651b59eece1665cb4773f15bce5a7a8f67 SHA-256: 1ed98a861828f12d78255e7f49fb34945c268901f1c2f92196cc10edac723706
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, pointing to numerous URLs hosted on compromised CMS uploads and disposable domains. These links are likely intended to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://gdlianyu.com/uploadfiles/file/64985109333.pdf In PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16143eadc08585---62062278505.pdfIn PDF document text
    • http://digivideos.net/ckfinder/userfiles/files/85653173083.pdfIn PDF document text
    • http://wxmx.cn/upload/ckimg/files/202109270342339660.pdfIn PDF document text
    • https://hotelangela.hu/userfiles/file/tonufexeluxepagel.pdfIn PDF document text
    • http://mrpokedb.com/uploads/files/winanebalowuvuwujugak.pdfIn PDF document text
    • http://bsinteriordesigner.com/userfiles/files/nogetusifogupoti.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613979fc7e637---44723542410.pdfIn PDF document text
    • http://hemeringen.de/ckeditor_ablage/userfiles/files/33343478546.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613987bc815ee---libukefepamugokel.pdfIn PDF document text
    • http://rorolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/52979382764.pdfIn PDF document text
    • http://yonezawanet.jp/units/24250/zcycom/files/54272991999.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/torexexalaxuramuxim.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613817b3261b7---vizasidejufopupa.pdfIn PDF document text
    • http://hoangminhphatkorea.com/webroot/img/files/3227231470.pdfIn PDF document text
    • http://mybed.tw/uploads/files/202109140251178235.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132cf3c5a981---74945376090.pdfIn PDF document text
    • http://bortran.com/upload/image/file/20210908124513.pdfIn PDF document text
    • http://cokhilegia.com/upload/files/dalubabiju.pdfIn PDF document text
    • http://ck-buhgalter.ru/userfiles/file/4073968884.pdfIn PDF document text
    • https://currenwatch.myhost360.cn/file/upload/files/09-12-21-57-07-44.pdfIn PDF document text
    • http://grabnerestriche.at/44197754301.pdfIn PDF document text
    • http://bivalyracing.hu/files/file/87026071718.pdfIn PDF document text
    • https://z87992961.com/upload/files/20210919181813.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=hbo+justice+leaguePDF 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_off0000b499.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB499 16296 bytes
SHA-256: 16ae05cb02a9ecb5166008252a1f3fd8bd801573988a12ae2b433331e1ab8186
font_01_sfnt_off0000de3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f655.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF655 10560 bytes
SHA-256: 58faeed7a90eaede16a7557f0d639f9994f76fcdb72b1ed6614e98a8a303da4f

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