Malicious PDF — malware analysis report

Static analysis result for SHA-256 917fe4f2c99ab342…

MALICIOUS

PDF

74.2 KB Created: 2021-09-24 18:11:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9dc602a997d1856aa357dadaa7152b45 SHA-1: d13b7964d81c90080c7044518bb1b919acc03b87 SHA-256: 917fe4f2c99ab342a57cd43fba7350c1c59a38294a0e9952465f79cd594c2716
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the presence of external URIs and the overall structure point towards a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://smidgel.ru/uplcv?utm_term=valmiki+ramayanam+sundara+kandam+tamil+pdf
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/83b55338bbc0e3c15f4a696ec941a720/21394530641.pdf
    • https://doctornhospital.com/banglanews24/editorsfiles/files/metomadugonapeluxeto.pdf
    • http://asesorgubernamental.com/images/file/bowawurotadigu.pdf
    • https://sunsetlearningcenter.com/userfiles/file/47827539597.pdf
    • https://saleskerala.com/ckfinder/userfiles/files/34906541495.pdf
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/18862e6fbc3697512df8ec0931282ce2/7402973072.pdf
    • http://zxpgw.com/userfiles/file/97496652508.pdf
    • https://neksav.com/upload/ckfinder/files/83513423780.pdf
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/161304b8ed46e5---lejelowixililojagur.pdf
    • http://vidol.nl/userfiles/file/19404637384.pdf
    • http://beta-rc.com/upload/files/53129887211.pdf
    • https://ip-kamera-rendszer.hu/ckfinder/userfiles/files/57135998491.pdf
    • https://www.sherpachristain.org.np/ckfinder/userfiles/files/fezawujujejidesi.pdf
    • http://aktien-analyse.de/images/File/3967679333.pdf
    • http://serviphony.com/tinymce/jscripts/tiny_mce/plugins/phpimage/phpimage/upload/images/file/jaxox.pdf
    • https://acconpriti.com/ckfinder/userfiles/files/73459668317.pdf
    • http://farmandari-sarvestan.ir/images/news/files/mozisigewerixaterususub.pdf
    • https://fancybox.pamlskovnik.cz/ckfinder/userfiles/files/gakoluwij.pdf
    • http://www.jobsincrete.gr/images/_user_na/file/xodokisodezonatuterame.pdf
    • http://trans-serwis.com/userfiles/file/52783082928.pdf
    • http://dragoniresorts.com/userfiles/74585759358.pdf
    • http://sonnenheizungen.ch/fckeditor/editor/images/file/vesaliwurafapuvawo.pdf
    • http://rainternacional.com/userfiles/file/93730336189.pdf
    • http://ecole.ru/text/images/file/21400297531.pdf
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613b9d5ca7f83---nireduz.pdf
    • 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_off0000b8b5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB8B5 16792 bytes
font_01_sfnt_off0000d0cc.bin
5df65d8ddf95058ee0e4ec02c868845af598f6639bdcfe4a27b55fcaf0f37ea3
pdf-font-stream PDF embedded font (sfnt) at offset 0xD0CC 10680 bytes
font_02_sfnt_off0000e931.bin
db9794ed058e22a4abfee552404eca11839f3ef4032259d745bbfd84360acd1b
pdf-font-stream PDF embedded font (sfnt) at offset 0xE931 18996 bytes