Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e8eda592ae51b2a…

MALICIOUS

PDF

98.7 KB Created: 2021-08-24 05:08:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 40a35e071692499edb0bd8d2fe652350 SHA-1: c2ad4e9e7b9974c4f80f03ce2b0662ff2b3cc7e4 SHA-256: 4e8eda592ae51b2a077195a69a917e9fe6b0ce4f04dffefec6ae37771f9c6e6e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised CMS uploads and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious links, which are characteristic of SEO poisoning or phishing campaigns designed to drive traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://ivaco.it/file/jivapimexevujot.pdf
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16120dd06644df---1497722323.pdf
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/jusajudukixaf.pdf
    • https://kovtec.pl/eurostyl/photos/file/22560229285.pdf
    • http://hiddenroots.org/clients/19739/File/fugunigoxupetesipa.pdf
    • https://urbanshapes.in/userfiles/file/befikirexijum.pdf
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/8b06912b7e92c779d0b80b14df1dacd1/755976824.pdf
    • http://thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/53109928849.pdf
    • http://firegallery.ru/img/upload/vavotewetebudiragud.pdf
    • https://hw-power.com/uploads/ckfiles/files/60e12f75bf92b.pdf
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/b817b554ff0091b007be03d670083894/77623360360.pdf
    • http://barcabianca.eu/upload/file/22904108470.pdf
    • http://aktifithalat.com/resimlerfiles/xutovunifam.pdf
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b21c0bb39d8---wifafaxi.pdf
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/6c246e7f01666253d23147119145f4dc/5494524523.pdf
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/176c336b46acbb04f5f767a28ebdd0db/radavetisawome.pdf
    • http://bigband-ulm.de/userfiles/files/taxavuweditarod.pdf
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16109208b65425---12727423824.pdf
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/lm38d3u7ekb8c9r347f3gqdef1/kuwevejepi.pdf
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/2bb8a24dd1b61bf423a6f27cf0e9e7bb/mejogubuzamuvabugigi.pdf
    • http://polymer-optix.de/userfiles/file/29138931857.pdf
    • https://gloriouz.in/ckfinder/userfiles/files/digirapagamufapagij.pdf
    • https://tenekedjieva.com/uploads/file/6650784420.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=ratio+and+proportion+word+problems+for+class+7
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011a94.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A94 16792 bytes
font_01_sfnt_off000132ab.bin
cee812185a14389db875b067e40789fd919c73484969fa1579f06e4152115c0d
pdf-font-stream PDF embedded font (sfnt) at offset 0x132AB 11104 bytes
font_02_sfnt_off00014c70.bin
bab1ab8780e1b7cbba0190c5ccd0749e08f6b5c119176e0617fde064504efcd0
pdf-font-stream PDF embedded font (sfnt) at offset 0x14C70 17840 bytes