Malicious PDF — malware analysis report

Static analysis result for SHA-256 502f24664069224b…

MALICIOUS

PDF

79.7 KB Created: 2021-06-27 02:54:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 1830ac6b3cc192dea9d42248b17d4e21 SHA-1: 3ba90531f369d016259c4997a680dd2b48f72a75 SHA-256: 502f24664069224b459b8bf2f48d9521038d599d9391a572a9dc39b240d1c8bc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or link farms. The presence of ML and ClamAV detections, along with the heuristic identifying a link farm on disposable hosting, strongly suggests a phishing or malware distribution attempt. The embedded JavaScript likely facilitates the redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • 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://medvor.ru/uplcv?utm_term=old+man+and+the+sea+download+pdf PDF link annotation
    • https://alexandrapanayotou.com/web/images/static/file/xazakodaxujanusegupofizo.pdfIn PDF document text
    • http://headrepublic.pl/images/files/nelivuwazupukudozer.pdfIn PDF document text
    • http://staresecurity.com/userfiles/file/depameku.pdfIn PDF document text
    • http://naturallabs.fr/userfiles/file/22532815375.pdfIn PDF document text
    • http://massageindex.nl/images/uploads/towofesofumunowusutimigi.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160980f33b4d80---7535991310.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ad681313380---12365204803.pdfIn PDF document text
    • https://empezo.xyz/js/ckfinder/userfiles/files/nejexalebopavexi.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/1fb529c6481524b17f0c8340a4c51e25/54406764538.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16075f2e729eba---12850794597.pdfIn PDF document text
    • http://uptownherndon.com/uploads/files/80939878496.pdfIn PDF document text
    • http://wami.cc/data/files/9944026080.pdfIn PDF document text
    • http://pkynfe.net/userfiles/file/49487786000.pdfIn PDF document text
    • https://mytekas.com/UserFiles/file/fonuw.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/3l8uppgu4748va8q5buc6kmgkc/bebetiziwasumixurabiduper.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160896a2ca230e---kimot.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608a3433b3d80---tobibokudijefesezo.pdfIn PDF document text
    • http://eltonltd.ru/sites/default/files/uploads/vobeketukixe.pdfIn PDF document text
    • http://turnyras.lt/Files/file/53191628614.pdfIn PDF document text
    • http://j-line.ca/fck_upload/file/leluzitogugotifitikim.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/1da15439e8b9d7fffea84bcd93bea05d/givurijuzoruvis.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c84d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC84D 10684 bytes
SHA-256: 228eab5349a1f9b38b45024e61222877ea54f46fd7ac51209f1e46c914f489b2
font_01_sfnt_off0000e0a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A9 26572 bytes
SHA-256: e0faa6aa99fe660cbdb1477397772a699e27b00d5047accdce753306db1c6bd0
font_02_sfnt_off00011807.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11807 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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