Malicious PDF — malware analysis report

Static analysis result for SHA-256 72e8ef8fc310d290…

MALICIOUS

PDF

86.6 KB Created: 2021-07-31 02:11:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: d52da318ac9ee5cb56f788eb4741c879 SHA-1: 85be25bd7a7f081a764cb1cf96624662b21bb682 SHA-256: 72e8ef8fc310d290a37aac2bd8e1419d1337e9cca9ff2c1fc4ea10617082ba0d
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many pointing to compromised websites or link farms. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are often used for phishing or to serve further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://archism.ru/uplcv?utm_term=shaadi+mein+zaroor+aana+full+movie+online+watch+free+dailymotion PDF link annotation
    • https://tndvn.com/js/ckfinder/userfiles/files/dufadazotoxumufenudezumax.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/64969461744.pdfIn PDF document text
    • http://utuin.net/files/fckeditor/file/laxutadeporowex.pdfIn PDF document text
    • http://teleinwestor.com/userfiles/file/65041654008.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/5438ef3b6efd5b6b22ae9c4dad059f95/nebotu.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/qqatom6n0pmoofm3bd6bmr6ftp/wokututile.pdfIn PDF document text
    • http://elite-weekend.com/clients/9/94/945a7f92a07ecc721aac768ad340748a/File/ruxogin.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160abdc827e0ec---61392095300.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/48721021558.pdfIn PDF document text
    • http://gasthaus-steinkirchen.de/img/editor/file/pikezupuxipizalolane.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fec9a679028---3720081867.pdfIn PDF document text
    • http://www.gyndoktors.de/ckfinder/userfiles/files/majuzudusugokupurufuk.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609729b00309e---5474783857.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/mafk6c30pf04nrs8ilk1f0q2e7/bepeleluke.pdfIn PDF document text
    • http://ongxoanhdpe.vn/upload/files/86047986510.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/85510906482.pdfIn PDF document text
    • http://beamstraffic.ae/amb/userfiles/file/20978196930.pdfIn PDF document text
    • https://xn--hjrnskadeakademien-mtb.se/userfiles/file/40372459780.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5a56bf10ee---43877968106.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b15d9d6d584---viximejonawebupipuwupe.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16086a0bf5b456---87771693330.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/60543733621.pdfIn PDF document text
    • https://taybaite.com/userfiles/file/fenosa.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_off0000ed99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000105b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B0 11072 bytes
SHA-256: 553f4128a73046b840ebce27d279dec988cc1e3124e94b62d9d9600e3208db6e
font_02_sfnt_off00011f69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F69 17208 bytes
SHA-256: 3bcde7de9e73907a1f5b274d6eb56b3a953095c55877e6ee79ab628dc4035a19