Malicious PDF — malware analysis report

Static analysis result for SHA-256 c755f24411b71452…

MALICIOUS

PDF

69.6 KB Created: 2021-09-15 15:55:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b9e0d2b2b6683be15c5cb7bf30726f44 SHA-1: f6176b283f7b6ef7b321220e443c3d63aa407698 SHA-256: c755f24411b7145295ac340c72c315de8a9ade6b2841dd82bbd038812ed0b259
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a link farm pointing to multiple external PDF files hosted on potentially compromised websites. The presence of embedded JavaScript suggests an attempt to execute malicious code, likely to redirect the user to further malicious content or download additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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 http://dietgame.net/admin/fckeditor/data/file/20210911000139.pdf In PDF document text
    • http://rileyillustration.com/images/agency/files/fikutuzevax.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/hb7prsoot6snbci1drbdvuijha/30854348975.pdfIn PDF document text
    • https://greenlakepaint.com/ckfinder/userfiles/files/29973165778.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/tesegaxuxevikepelag.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b865dc6386---vixutepemilofimuso.pdfIn PDF document text
    • https://zohopin.com/calisma2/files/uploads/29714749513.pdfIn PDF document text
    • http://xn--b1akwe.xn--p1ai/userfiles/file/75807771895.pdfIn PDF document text
    • http://botaierpharm.com/upload/files/tixumimuxivan.pdfIn PDF document text
    • https://srinivasagroup.com/ci/userfiles/files/vukupasawovofakiziw.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/uo3nti1adbibmsqmavtk9us0j1/74317726441.pdfIn PDF document text
    • http://urduhadith.org/survey/userfiles/files/dujedumegesomeveg.pdfIn PDF document text
    • http://kapsalonvogue.nl/files/file/17100141698.pdfIn PDF document text
    • http://galluccifaibano.com/userfiles/file/23559441510.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/54650040649.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/ad29b39fb965daa17ad58494856ba077/55450368655.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/161303b0f0194a---ronutepesubi.pdfIn PDF document text
    • https://aildf.in/userfiles/file/11958784474.pdfIn PDF document text
    • https://loffoxfitness.mvwebsolution.com/userfiles/files/50013076036.pdfIn PDF document text
    • http://sk-massimo.com/js/upload/files/48132118709.pdfIn PDF document text
    • https://woft-dining.com/webroot/editor-uploads/files/56954990745.pdfIn PDF document text
    • http://mexvp.com/ckfinder/userfiles/files/denuxipuvadamitizarelobin.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021091015210773499.pdfIn PDF document text
    • http://top1np.com/ckfinder/userfiles/files/98369626516.pdfIn PDF document text
    • https://99shayari.in/userfiles/files/31222500479.pdfIn PDF document text
    • https://cnn-logistics.com/asset/files/tugoviwumitekapatavo.pdfIn PDF document text
    • http://moneymaker-gold.de/files/25598430118.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=subway+surfers+subway+surfers+mod+apkPDF 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_off0000b456.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB456 10924 bytes
SHA-256: 78d61788b2145103ca7ed8d94544c38c323affea06419acb5696bbade4c24e6b
font_01_sfnt_off0000cd87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD87 14104 bytes
SHA-256: 7ebf707b87dee87c000824765528c368bfe244642bcf9808fa6c957ed872ffac
font_02_sfnt_off0000f0af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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