Malicious PDF — malware analysis report

Static analysis result for SHA-256 4443845da7b763c5…

MALICIOUS

PDF

80.4 KB Created: 2021-09-18 14:59:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 677f860531cd0cb265cf7735329312df SHA-1: c874c39d3883f24923ab44601b4188a1ca0149bf SHA-256: 4443845da7b763c5536a8926f35df728cc2fcd8927501d8ef1e21d7d58b514dd
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains embedded JavaScript and numerous external links, many hosted on disposable or potentially compromised domains, suggesting an attempt to redirect users to malicious content or download further payloads. The presence of a 'download button' heuristic further supports a phishing or malware distribution lure. ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicates malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 8

  • 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.
  • 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.
  • 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://oniceh.ru/uplcv?utm_term=wwe+2k+obb+file+download+for+android PDF link annotation
    • http://nail-free.com/ckfinder/userfiles/files/warawodorakuwatux.pdfIn PDF document text
    • https://irrisyst.eu/files/file/folezit.pdfIn PDF document text
    • http://hanmih.com/userfiles/file/20210902161340.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/7c38f38064055b72a98c1a1dbf7c4b6f/34578541988.pdfIn PDF document text
    • https://coverline.ro/userfiles/file/fepufagiv.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f801ae4544---povesevewupibub.pdfIn PDF document text
    • http://tufaghanafc.com/js/ckfinder/userfiles/files/68682446463.pdfIn PDF document text
    • http://taiwan-tsai.com/upload/files/gefupolapov.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/tominewiguge.pdfIn PDF document text
    • http://aligokdemir.com/resimler/files/41995736028.pdfIn PDF document text
    • http://islenapuntos.com/campannas/file/jemudetubutexonilegoki.pdfIn PDF document text
    • http://msnladyboy.com/ckfinder/userfiles/files/kadasitixed.pdfIn PDF document text
    • http://viorina-deko.com/images/file/3979253653.pdfIn PDF document text
    • http://araulmor.tel-cor.com/images/library/file/57353663772.pdfIn PDF document text
    • http://sushigonewildtogo.com/uploads/files/3866778075.pdfIn PDF document text
    • https://www.la-melodie-des-saveurs.fr/ckfinder/userfiles/files/dimagawixokiwazaf.pdfIn PDF document text
    • http://bradhelferlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/32492216762.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/77354309504.pdfIn PDF document text
    • https://bluetact.com/ckfinder/userfiles/files/48149937402.pdfIn PDF document text
    • http://permanentnimakeup-brno.cz/userfiles/files/42798479524.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16137e35087ec6---tipawasuvojipajula.pdfIn PDF document text
    • https://kaplaitalia.it/userfiles/files/90016365431.pdfIn PDF document text
    • http://hitmet.slektenkaas.com/bilder/file/72462679028.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_off0000d661.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD661 10512 bytes
SHA-256: 48f9e42fa9a796a85edbb57e388fe95c834014a9cc40a54f2ca8d9c642bf91e5
font_01_sfnt_off0000ee76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE76 17532 bytes
SHA-256: 7f60074b9dd04dfa4fde417ed6c905712770d85756354d8def14b63d064f4668
font_02_sfnt_off00011bdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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