Malicious PDF — malware analysis report

Static analysis result for SHA-256 01128dae1da03610…

MALICIOUS

PDF

70.2 KB Created: 2021-09-30 22:38:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 82bca02ef3df2f08ed44ff032263233e SHA-1: fe00421c59bb4445f9d10e1ebc514a3396cb7b6e SHA-256: 01128dae1da036107b5255596508ee0dfcb21648c8dbae85d0ba1f091d6e85cb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many of which point to compromised WordPress sites or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • 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://simbotour.ro/ckfinder/userfiles/files/nutudusuwalofalibajo.pdf In PDF document text
    • http://patp1ryb.ru/media/file/55567327522.pdfIn PDF document text
    • http://hamdannepal.com/userfiles/file/33296226890.pdfIn PDF document text
    • http://medicaldistri.com/ckfinder_files/files/gibakonetat.pdfIn PDF document text
    • https://felicityokolo.com/file/52140951500.pdfIn PDF document text
    • http://www.sictombbi.fr/ckfinder/userfiles/files/voripibazagon.pdfIn PDF document text
    • https://exam11.menapoint.com/app/webroot/upload/files/siladi.pdfIn PDF document text
    • http://flairpens.ru/uploads/file/beziwojivunisojovofower.pdfIn PDF document text
    • http://realestatespoznan.com/uploads/gikepijulunumif.pdfIn PDF document text
    • http://donghotam.com/luutru/files/mizakosodesawakezoruj.pdfIn PDF document text
    • https://viboot.com/ckfinder/userfiles/files/59868024459.pdfIn PDF document text
    • http://tcgardening.com/userfiles/file/2021091414224273499.pdfIn PDF document text
    • http://artetendasud.it/userfiles/files/11071354918.pdfIn PDF document text
    • https://branpc.in/ckfinder/userfiles/files/fotigaguvinaxuli.pdfIn PDF document text
    • https://stmarys-perthamboy.com/upload/File/27866843318.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/37277089802.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/64708048033.pdfIn PDF document text
    • http://lexus-custom.com/js/upload/files/nubawaxi.pdfIn PDF document text
    • http://fygl.net/uploads/file/242027485878.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/161543e7e51729---82794073534.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e84b5584a9---19050620034.pdfIn PDF document text
    • http://ilkjv.com/Images/Media/files/pewovow.pdfIn PDF document text
    • http://etspak.com/survey/userfiles/files/94440034013.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c8120f9c208b8c3b106f6e742c7b6af8/dekevoxitokulovifavape.pdfIn PDF document text
    • http://gachtrangtritranvinhtin.com/gachtrangtritranvinhtin/Images_upload/files/20929200863.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+make+android+see+iphone+emojisPDF 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_off0000b39e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB39E 10912 bytes
SHA-256: 48265e0bf92878c57a023804bf828fc247575462fccda0ebb66d819ae7fa9fb6
font_01_sfnt_off0000cc9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC9C 15132 bytes
SHA-256: 7bdee495d33ddb57678112e2975077df6cc667cba12c4927adb330285d3ef4a3
font_02_sfnt_off0000f29d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF29D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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