Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1aa3ec52ef1e7d4…

MALICIOUS

PDF

78.1 KB Created: 2021-06-26 18:49:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 7b8089ce206d9875f42bb02f373280d0 SHA-1: dacef8d713a024c23dcc8bf5de6e3dfa1f36c919 SHA-256: a1aa3ec52ef1e7d4bc951f0fc0913ae9b3ebd19071b7d7b4a9c6f92b51f08690
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is classified as malicious by ML models and ClamAV, indicating a phishing or trojan distribution attempt. It functions as a link farm, directing users to various compromised websites and disposable hosting, likely to download further malicious content. The presence of external URIs and link farms suggests an attempt to obfuscate the true malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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 https://allytemp.ru/uplcv?utm_term=site+to+download+free+ebooks+pdf PDF link annotation
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077002cdde82---patemowededof.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca9e398d35---mutawokirojukibaser.pdfIn PDF document text
    • http://www.firengo.com/userfiles/files/8844292239.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093a2c94e19b---lenoselijikavanomasuwawux.pdfIn PDF document text
    • https://treasurehunterdetectors.com/ckfinder/userfiles/files/repanawusa.pdfIn PDF document text
    • http://winkeleninzundert.nl/uploadimages/files/33367323885.pdfIn PDF document text
    • http://scandirent-new.ru/uploads/assets/file/97512306394.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4497c2cf54---kavonuvuru.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1609f47c86ad28---76497871584.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/73hedtb0o0um78ch09ackfuk9f/11821568894.pdfIn PDF document text
    • https://lawyerupsmart.com/tempimg/file/xebojisuw.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/9ed736bad424cbbbcf8fb321ea39a4a1/16732888681.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609590b862966---96195306308.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/3d427436f14e8fcaf85728ac6510a7c2/vofawapifawugejovemofu.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af85f1419b8---25820426361.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d49f83c24c0---94568573531.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ab41a30147a---38285677660.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/xixariramebonaxupa.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c29f7fd082b---31956212150.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/97e181f2d552663e75170ca522d38205/lamukelegod.pdfIn PDF document text
    • https://dubigroup.com/admin/fckeditor/editor/filemanager/connectors/upload/file/porulusegite.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c559fd53c71---megofobimazabobefi.pdfIn PDF document text
    • https://familienbilstrup.dk/userfiles/file/wesibo.pdfIn PDF document text
    • 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_off0000cf8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF8B 10884 bytes
SHA-256: f300318ec1c5bc231ff180a985af50991377117f7a0c238c00da0ed3d28d4a0c
font_01_sfnt_off0000e8ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000100be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100BE 16424 bytes
SHA-256: ffccccff88d1430db3f1d09c87f42347d10ea459b75b7e06dbd03768294a53dc

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