Malicious PDF — malware analysis report

Static analysis result for SHA-256 c610c53407abf46a…

MALICIOUS

PDF

86.5 KB Created: 2021-08-15 03:41:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 733e96f2a6f4e4e853a02b3d2feb72c0 SHA-1: 84b6cf8d974a61aea0a538ed49e8df105048cb2d SHA-256: c610c53407abf46aa5a96184daee16e62518bb78674dbaf32a94a580ddd5eb95
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The file contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the nature of the heuristics point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • 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.
  • 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://smidgel.ru/uplcv?utm_term=increase+speaker+volume+iphone+7 PDF link annotation
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160cdcda135527---nunesepupasakitipu.pdfIn PDF document text
    • http://bonaparte-kerkrade.nl/fckeditor/ckfinder/userfiles/file/74000405079.pdfIn PDF document text
    • http://goksirkrupskimlyn.pl/img/upload/files/16085135907.pdfIn PDF document text
    • https://hijaulumut.com/contents//files/20824548129.pdfIn PDF document text
    • http://shipagents.nl/uploadfiles/file/54279361002.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607143aa909e2---37045941806.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/5afe47ddaa02a8c7cd1bbf071d3ee0c9/73093788874.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/14747302093.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/1b848d4c1b192b174b2b70691d9324b7/zixopabovuwox.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076cc5453689---94895170470.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/cc1f33e97d2836c7e295d42e46c4d64c/94972998184.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/777um5t35ifqcthjdatgu8tkbr/61142531186.pdfIn PDF document text
    • http://sanmorales.es/userfiles/files/tizanevefinab.pdfIn PDF document text
    • http://klubalfa.org/img/userfiles/file/fexizoxibumodanabaloba.pdfIn PDF document text
    • http://razaviota.ir/basefile/razaviotair/files/949202959.pdfIn PDF document text
    • http://manisafar.com/basefile/marcosafarir/files/89872175370.pdfIn PDF document text
    • http://koreanhotpot.com/uploads/files/11684898368.pdfIn PDF document text
    • http://come2menorca.com/images/file/39189818099.pdfIn PDF document text
    • http://xn--oy2b9bv81anouola.com/upload/file/202108101337473020.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c671d90957f---33955293643.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160795d7f6da11---gatitedupufegewepogudo.pdfIn PDF document text
    • http://prospekt-rostov.ru/ckfinder/userfiles/files/jefojojuro.pdfIn PDF document text
    • https://guptajimarriagebureau.com/userfiles/file/wedalunilata.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/68172994390.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_off0000ee19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE19 17152 bytes
SHA-256: 20b7792500d6ac19dccf489870dd6ec93601977df7a5da437715bf702599baf1
font_01_sfnt_off00011abf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ABF 10800 bytes
SHA-256: 2978b9d601948b1ca5b68a22a5447ba63d3e3638d32a6d3274dedf6d78d9ba6a
font_02_sfnt_off00013371.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13371 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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