Malicious PDF — malware analysis report

Static analysis result for SHA-256 64e240ebd4a83114…

MALICIOUS

PDF

91.4 KB Created: 2021-09-06 19:26:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 778ce91e11e90fb10761252c2456b0c1 SHA-1: e58f3646bafae515bfca95084fa59f5f7be1d8db SHA-256: 64e240ebd4a831146f1ee04350e1c826843cfc91e82e054d1ef0b0dda6687dca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded URLs, with several heuristics indicating a link farm hosted on compromised CMS upload storage. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the presence of numerous links to potentially malicious or compromised sites indicates a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16120b94247679---49623258729.pdf
    • http://ecohort.com/userfiles/files/4832134785.pdf
    • http://bfr-bialapodlaska.pl/userfiles/file/bisematulul.pdf
    • https://villadelauca.com/userfiles/file/73033506358.pdf
    • http://szwygs.com/upload/47084509947.pdf
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b73026d4d86---85729495989.pdf
    • http://bigbazar.cz/is/images/FCKeditor/File/nuxufufigajujuvidakexaje.pdf
    • https://tipresentoio.it/images/file/kikilitokaf.pdf
    • https://pcetravel.com/files/file/84592228854.pdf
    • http://bukharageorgia.com/sites/default/files/file/74907354477.pdf
    • http://lorichphoto.com/pictures/file/70993231746.pdf
    • https://petikdaun.com/contents//files/35230049962.pdf
    • http://gulfcoolcontracting.com/uploads/userfiles/file/file/wanafevoma.pdf
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/3794260681.pdf
    • https://gionggiacam.com/ckfinder/userfiles/files/gijuxiwuje.pdf
    • http://mankatomnclassof71.com/clients/e/e0/e0e8961458839910853a12af65841b27/File/24473942370.pdf
    • https://tsolisp.com/files/file/jusolafodod.pdf
    • http://angarakshaksecurity.com/userfiles/file/42113063609.pdf
    • http://www.hussco-steel.com/husscofiles/files/8561065177.pdf
    • https://rosewoodcity.org/nbloom/fckuploads/file/85777458231.pdf
    • http://ankurgroups.com/userfiles/file/mifojulotapinadimuvav.pdf
    • http://nelly-design.ru/upload/files/dokekuxote.pdf
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/ae7a01854vthgb1tb3hmjs0kbn/rerute.pdf
    • http://a-swiss.com/upload/userfiles/file/65684731235.pdf
    • http://ms-krmelin.cz/app/webroot/files/files/50550961424.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=fujitsu+scanner+fi-6130+manual
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/571e32a46e015162f917bcbcb63d8daf/mufiruwironudeno.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_off0000fb3f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB3F 16792 bytes
font_01_sfnt_off00011356.bin
186bcf33e7f01195ae95aec6da32d3d7dde87dba5659e7eace2f9f7311808682
pdf-font-stream PDF embedded font (sfnt) at offset 0x11356 11132 bytes
font_02_sfnt_off00012d65.bin
5a6f2809a4532bddba79137fdf1bc09f3d980001d1000b17522d3a6c6cf489e6
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D65 19348 bytes