Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cc3821546aa2166…

MALICIOUS

PDF

84.1 KB Created: 2021-09-05 20:46:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: dcf4da730632c8a8e495a3670e2b825c SHA-1: 89a4ec3e37659445f6ba244fac71420a1146b674 SHA-256: 9cc3821546aa2166de0f7b36c8c7ffb25912c0512e20a3489631857ce4144d22
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many embedded URLs pointing to various domains, some of which are associated with compromised CMS uploads or disposable hosting. The ML_NYX_PDF_MALICIOUS and CLAMAV_DETECTION heuristics strongly suggest malicious intent, likely related to phishing or malware delivery via the numerous external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 6

  • 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.
  • 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 http://seibyou-koujien.com/files/files/nukibukupokigikadotusow.pdf In PDF document text
    • http://teamwork-poetschke.com/ckfinder/userfiles/files/93581653892.pdfIn PDF document text
    • https://xn--80aaijz0c.xn--p1ai/ckfinder/userfiles/files/wuponekajadinakomunik.pdfIn PDF document text
    • http://kozhencherrymtc.org/userfiles/file/82649371428.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/bowib.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608293e92f4f6---bejowojovem.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/3697826458.pdfIn PDF document text
    • http://seoulgreeter.com/userData/board/file/32018701661.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16125c0cf88abf---39494889041.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e36457247---88201430486.pdfIn PDF document text
    • https://vasantviharproperties.com/userfiles/file/xupirewaw.pdfIn PDF document text
    • http://sentezetutmerkezi.com/upload/ckfinder/files/21751651067.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/36dc7e4f8e7f60e4ab56174ce3e042bb/14387766810.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/51304157384.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///xerewunere.pdfIn PDF document text
    • http://hotstamping.pl/files/file/85501146613.pdfIn PDF document text
    • http://unityproductions.com/upload/files/66807826702.pdfIn PDF document text
    • http://szilasfood.hu/pic_upload/files/bixakozutolumuvufilepuxor.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/ragibewatoroxaga.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/8iamfadj7m0572v087pse7b8hi/90780572001.pdfIn PDF document text
    • http://qunjl.com/userfiles/files/vezedosura.pdfIn PDF document text
    • http://arlingtonhigh1961.com/clients/e/ef/ef36f0800c0a5d5a0b00d5ecc8c3c6da/File/nokab.pdfIn PDF document text
    • http://cmi.nfe.go.th/ckfinder/userfiles/files/4514440410.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/18a256b01f9e3a6d6a07fc72dc0ff187/jojetevuverurev.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/wibazomefaf.pdfIn PDF document text
    • http://debandhelder.nl/ckfinder/userfiles/files/91791808097.pdfIn PDF document text
    • http://cnhhgj.com/upfiles/userfiles/file/fepidibebaneri.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/3iqvpc19o8skd0738460ladvn1/labubupesupaxuxi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=the+hungry+woman+cherrie+moraga+pdfPDF link annotation
    • 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_off0000e078.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE078 18196 bytes
SHA-256: 68c103280cb7875c9dd20f37bbea482fb51d0100a3035024bebdbbb64dcb0fc7
font_01_sfnt_off00010f03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F03 11016 bytes
SHA-256: 48329209fed9725551bfe87ce0f2d080008ac239f2d7c59c7faea78b3ca124e3
font_02_sfnt_off00012848.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12848 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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