Malicious PDF — malware analysis report

Static analysis result for SHA-256 82cfaea63f7caae2…

MALICIOUS

PDF

83.5 KB Created: 2021-07-15 18:02:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7a0d5865695b562893af75aeb28aa1ce SHA-1: a9731df62a965ae927e6da55ebea94d3c967fabb SHA-256: 82cfaea63f7caae25475306e052ef56f632be2ea018f978c419c4aab30beafc9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by ML classifiers and ClamAV as malicious. It contains numerous links pointing to compromised websites, specifically utilizing WordPress upload directories, suggesting a tactic to host malicious files. The presence of link farms on disposable hosting further indicates an attempt to obscure the true malicious destination. The file's primary function appears to be directing users to these compromised sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160be442e39431---tujova.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/cf4vstot9v9pi3ejbnmhn2u547/ribufu.pdf
    • http://arslanemlak.come/file/71636526195.pdf
    • https://cualuoihoanmy.com/uploads/userfiles/file/dowuninojezu.pdf
    • http://swaminarayangm.org/userfiles/file/fudesutixitizubobufulik.pdf
    • https://stratasphere.online/userfiles/file/58774592376.pdf
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca8533e22e---44151014343.pdf
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160989138f3f99---30722577399.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/7ac14a64b53a1477da835e6d42398990/kexefumewadagux.pdf
    • http://langmypham.com/luutru/files/pizegufabakunepi.pdf
    • http://bundoreh.com/fckeditor/files/file/96120710874.pdf
    • http://anaminfo.com/attachfile/file/xobofuwux.pdf
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160d45c342b51c---kuvaxur.pdf
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160790dc9f264b---neromedetuv.pdf
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/1e14c57fd8c6c5d9f2ba2690faf97e59/xavobugawe.pdf
    • https://wrd13.com/force/file/bafap.pdf
    • http://rubivina.com/Images_upload/files/kinigumubemob.pdf
    • http://montaze.org/democms/userfiles/file/xosuxaralupajevabiluw.pdf
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c4a9ff81e3a---23989331510.pdf
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/93426b0a8dde2fbe51728be5fb62b8d2/fosuwujaru.pdf
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/9df43f1fd891aa486df9804ad26c9176/46516805546.pdf
    • https://anup.bo/images/files/nuvudefuzudekabe.pdf
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160909346d6055---25379474559.pdf
    • http://capesociety.ca/uploads/files/88827762882.pdf
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/3qohg1n2m0arqsqvbkkcu6ci26/mizigosuduvozagujoz.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=worksheets+on+ratio+and+proportion+for+grade+6
    • 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_off0000e00c.bin
6d6889d6559c5cfd7d1f21ae81ea053ab4ad76fdaa578c2e70e1043914dc5e6a
pdf-font-stream PDF embedded font (sfnt) at offset 0xE00C 10984 bytes
font_01_sfnt_off0000f961.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF961 16792 bytes
font_02_sfnt_off00011173.bin
1bbaf10d7b546ab7fa6e0b12d2e44fd18d465aa751e1101ce5575c03d43d7672
pdf-font-stream PDF embedded font (sfnt) at offset 0x11173 17760 bytes