Malicious PDF — malware analysis report

Static analysis result for SHA-256 602ee8a2c265a87a…

MALICIOUS

PDF

79.5 KB Created: 2021-09-03 18:32:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: de2d17bec461934ef3fe1a5a805d4a4b SHA-1: 888b86b8f0a8275b2f3473363731e1c25edba8b6 SHA-256: 602ee8a2c265a87aad1087559f0700c57e72f5ad7e85f9fb0f8a1ed3ce5e1d8b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many of which are hosted on disposable domains or compromised WordPress sites. This indicates an attempt to lure users to malicious content, likely for phishing or malware distribution. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://medvor.ru/uplcv?utm_term=circle+theorems+class+9+pdf PDF link annotation
    • http://thejosephinebryantfamily.com/clients/48776/File/bixenujomurinenisigo.pdfIn PDF document text
    • https://radmangroup-ye.com/rgfiles/file/52195931177.pdfIn PDF document text
    • http://studiotecnicobonoli.com/userfiles/files/91556909459.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/45607805594.pdfIn PDF document text
    • https://alibabaoman.com/basefile/alibabaomancom/files/satil.pdfIn PDF document text
    • http://www.niceresidence.net/image/upload/File/55157679019.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/65313236694.pdfIn PDF document text
    • http://bhk-aindling.com/userfiles/files/lawifodojetagamutaduji.pdfIn PDF document text
    • http://hotspot-usa.com/js/upload/files/zinowuwi.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/70028398943.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/89617e5eea0c5a503095d659282f6f21/55494195801.pdfIn PDF document text
    • https://gabconstruction.com/ckfinder/userfiles/files/juvizafozuwesozub.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/4jlhtn748lm2dvva41pjl1g0m5/tosanedifurekaxafesixi.pdfIn PDF document text
    • http://djapm.com/userfiles/file/sexeniwaza.pdfIn PDF document text
    • http://isotech.si/uporabnik/file/bakegigiliwozevifefu.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/28453799342.pdfIn PDF document text
    • http://cokhixnktientien.com/Images_upload/files/somopijarewe.pdfIn PDF document text
    • http://wernitznigg.at/files/boguvo.pdfIn PDF document text
    • http://worldcar.jp/userfiles/files/74754776712.pdfIn PDF document text
    • http://minhanh.com/files/dojorulum.pdfIn PDF document text
    • https://suprastoc.ro/userfiles/file/rudam.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/0r582hnk4q056cc164c2iabp03/86210822205.pdfIn PDF document text
    • https://kompaspt1.com/contents//files/74335550385.pdfIn PDF document text
    • https://pui-vital.ro/msg_media/file/41262246265.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/348baf7365d749cf29c0951e3a3b675b/kadajamugo.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a41a4c2d0de---sojuberivil.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_off0000cd0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD0B 10980 bytes
SHA-256: cf4f090473d3f25d016d9ad5d64cb26af5cc537a4b9c60d83855fe8b9c58029b
font_01_sfnt_off0000e690.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE690 18940 bytes
SHA-256: 08b491ca4c950d18d2c51b3e79aa65ecf6152e64c2e2d308ecd28ce0baeb5666
font_02_sfnt_off0001182e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1182E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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