Malicious PDF — malware analysis report

Static analysis result for SHA-256 dda5d5423c374e7f…

MALICIOUS

PDF

81.5 KB Created: 2021-09-17 07:00:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4ee1bdaa3dfcb976882ef78cf5ff3f6b SHA-1: 47f4ec7e96bb8f7042f3d64ec90e980f17c906fe SHA-256: dda5d5423c374e7fdfcaea1a0368900ff249459d821311e30354a1f65f6044b9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external URIs and is identified as a link farm, with many pointing to compromised WordPress uploads and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of multiple suspicious URLs suggests an attempt to redirect users to malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://synerhu.ru/uplcv?utm_term=docs+app+download+for+android PDF link annotation
    • https://senesi-sklad.cz/userfiles/file/51190918726.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/70456009450.pdfIn PDF document text
    • https://anzhero-sudzhensk.verlauf-ekb.ru/admin/ckfinder/userfiles/files/26849970627.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614003c96aa81---63578453080.pdfIn PDF document text
    • https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/33179363532.pdfIn PDF document text
    • http://styrexon.cz/userfiles/file/fejazibomupopelavenof.pdfIn PDF document text
    • http://i-dron.cz/data/file/34390777925.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f26dc7f91a---zuxawoxirixixalafirosu.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb4d5d52fb---paxisi.pdfIn PDF document text
    • http://gulfcoastlist.com/userfiles/file/wojijew.pdfIn PDF document text
    • http://planao.com/ckfinder/userfiles/files/2656080891.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/7c8f9557614e4e2488460c500fc15a41/37342305061.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/7b58d17df3814bbff9f4752653d1d45e/tutur.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/betusirufezubunev.pdfIn PDF document text
    • http://portaldeaquidauana.com.br/ckfinder/userfiles/files/xanunavinipit.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/f0090fde7c7fe298f95739697e974649/suwenujogeramax.pdfIn PDF document text
    • http://hertzlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/borugiten.pdfIn PDF document text
    • https://mannoorpally.com/uploads/file/56931197574.pdfIn PDF document text
    • https://mmrh.myagenda.cz/pictures/editor/files/80995643827.pdfIn PDF document text
    • https://ww150002.linebot.net/upfile/files/20210913152830.pdfIn PDF document text
    • http://huerural.com/uploads/image/files/14738200916.pdfIn PDF document text
    • http://cuathepvangohaiduong.com/images/ckeditor/files/72963059681.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/2ehiipru13v2mqs0pqu24ce5r1/22979839766.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_off0000d9e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E7 10468 bytes
SHA-256: 60f1e06c0fddad38dbcc5bbd63b0ba249117f1f127b5300fdca7804ed126e264
font_01_sfnt_off0000f1c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C4 18060 bytes
SHA-256: 2906c6c6abfdbf1806863cd7ec62b2b717d695155c35692a816fbeeec0e34246
font_02_sfnt_off0001205d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1205D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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