Malicious PDF — malware analysis report

Static analysis result for SHA-256 a56fd443b4fce688…

MALICIOUS

PDF

80.9 KB Created: 2021-09-19 05:32:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4b56596c2e01ddbcf7511f5184e51f4a SHA-1: 9463aebcedbaa63f5e5439a7020699b957aaf9aa SHA-256: a56fd443b4fce688d02e734720d3c4a0bcbbbdae2bc49810254d2961a9ce5286
164 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the presence of a link farm hosted on a compromised WordPress site, likely intended to trick users into downloading a payload. The document body is unreadable, but the presence of multiple unknown URLs and the 'download button' heuristic further support a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614683a734039---25730702739.pdf In PDF document text
    • http://jingluo.net/uploadfiles/files/6152474932.pdfIn PDF document text
    • http://snuhonors.com/userfiles/file/koresesosofunowazababexeb.pdfIn PDF document text
    • http://yalcinsezer.com/upload/ckfinder/files/55170756578.pdfIn PDF document text
    • http://autoscuolemontagna.it/userfiles/files/wikig.pdfIn PDF document text
    • http://kythuatviet.vn/uploads/userfiles/file/85033078248.pdfIn PDF document text
    • http://interstyle.org/content/xuploadimages/file/93278983378.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/161350498412db---nipegemofekaxuzalevoka.pdfIn PDF document text
    • http://cmrivestimenti.com/userfiles/files/vozelopukesi.pdfIn PDF document text
    • http://quangcaosmsgiare.com/media/ftp/file/kodudizadogu.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/dmelt2rgq8d5ialjpdmhq92ju1/nozopinedifexerifig.pdfIn PDF document text
    • http://unstitchedfootwear.net/files/file/tajexizusulapeta.pdfIn PDF document text
    • http://isotech.si/uporabnik/file/fofubibepajewe.pdfIn PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/xuvekebivukojoxubik.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021091908000213.pdfIn PDF document text
    • http://rotarybrescello.it/userfiles/files/6044635343.pdfIn PDF document text
    • https://ccskin.com/geektic/files/22635522377.pdfIn PDF document text
    • http://riverside-plaza.com/upload/userfile/files/57384787894.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/18402306698.pdfIn PDF document text
    • http://webmba.fr/client/logo/file/funadopiwawu.pdfIn PDF document text
    • http://jinshi66.com/uploadfiles/files/51637447141.pdfIn PDF document text
    • http://siamsankyo.com/Uploads/file/sopuvumuz.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/o6ovde0htf0p1uonei96sf9sb6/napewun.pdfIn PDF document text
    • http://westernmaki.com/uploads/files/13427485825.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=smart+view+apk+downloadPDF 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_off0000d67e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD67E 18132 bytes
SHA-256: f0e6a6ca60541b7553977daf3e6c8caa88730af5092dd9ddb836498a51070938
font_01_sfnt_off00010583.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10583 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D9A 10704 bytes
SHA-256: ddbe175e65341001419be85bd58503234a2a5fe29f3e67d1c612a112f4dc8f76

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