Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2d063b7a4733602…

MALICIOUS

PDF

80.7 KB Created: 2021-09-20 02:57:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 842be8791101beec6a15c27b290dc2b0 SHA-1: fc9e63cd71aa2efc002c61dc778d593fb8bd2bdb SHA-256: b2d063b7a47336029bb33da75c13966adc456311c51275ad04e0198b49277e06
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and ML classifiers. It contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites or disposable hosting, forming a link farm. The embedded JavaScript likely facilitates the redirection or download of further malicious payloads, contributing to a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://allytemp.ru/uplcv?utm_term=come+eliminare+app+predefinite+android PDF link annotation
    • http://dreamsurgeryen.net/ckupload/files/27945233237.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1614110b7742a7---79750770731.pdfIn PDF document text
    • http://costanzolegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/65609542063.pdfIn PDF document text
    • http://gamaxmotor.cz/data/dokumenty/tiweze.pdfIn PDF document text
    • http://envigest.cz/upload/file/keladuj.pdfIn PDF document text
    • http://jikaramen.com/uploads/files/94023678047.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16137d86121032---3794139905.pdfIn PDF document text
    • http://realestatespoznan.com/uploads/42396963291.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/ccf34d7931e929ca6116d42c2f9971ce/37445069102.pdfIn PDF document text
    • https://vetamblj.si/ckfinder/userfiles/files/xutumemolipapip.pdfIn PDF document text
    • http://forspeed.cz/ckfinder/userfiles/files/weranujufigujujipatunufif.pdfIn PDF document text
    • http://abworder.com/uploads/files/wejekobobaganebunuxek.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/jipipugoxarumovevavazo.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613c6438d2bee---40973986136.pdfIn PDF document text
    • http://npk-bypassdrr2.com/file_media/file_image/file/wusekokid.pdfIn PDF document text
    • http://air-con.ru/upload/files/vereniremesu.pdfIn PDF document text
    • https://ratsimae.ee/media/contents/file/47283378467.pdfIn PDF document text
    • http://noticiascgnews.com.br/ckfinder/userfiles/files/subozuworuwoloda.pdfIn PDF document text
    • http://arredamenticucinesiciliane.it/userfiles/files/jafirijaxoletapigupupufoz.pdfIn PDF document text
    • http://gzperson.com/uploadfile/files/jafetiriju.pdfIn PDF document text
    • http://toyotaquangninh.org/data/dulieu/files/zirusuretemikowedizekiga.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/kekuzunamuxulefeme.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/8g9naggcf7gct8k48rrvlr529e/92543275609.pdfIn PDF document text
    • http://nawaress.com/webroot/js/ckfinder/userfiles/files/43820593970.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_off0000d5d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D6 10520 bytes
SHA-256: e4033aad280de7138e849c6e7c79a853f306868fbd655446aa1a40c58bab0d20
font_01_sfnt_off0000edb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB7 18364 bytes
SHA-256: 7f3c4d5abf194b0b085c6730b9dfd693db00fbe066a525103acdd7e6ebabb3df
font_02_sfnt_off00011d8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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