Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc451e8d43c080fd…

MALICIOUS

PDF

97.0 KB Created: 2021-09-09 11:00:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: 7755b614fea7ac8187c7b4069134dcfe SHA-1: dfa9be89e2e459ad4c786fd7034cf0c7d0aad6d7 SHA-256: bc451e8d43c080fdbd52faf424f76c13817f92a19c0b56afab8e88ea2a4ddd41
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9879

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://dyccpharma.com/upload/files/negurudefad.pdf In PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/4ff41587c7b0a3b11fc736196391ba48/notomuwop.pdfIn PDF document text
    • http://laboratoriodiprogettazione-ve.it/userfiles/files/viviwezogusazejenubafelo.pdfIn PDF document text
    • http://ttmplus.com/userfiles/files/sivodorudomumaseb.pdfIn PDF document text
    • http://sangtaoad.com/uploads/userfiles/file/96504989442.pdfIn PDF document text
    • http://5mal4.de/moneyvidya/web/images/userfiles/file/58449382199.pdfIn PDF document text
    • http://risme.vn/files/dalovenere.pdfIn PDF document text
    • https://swagath.co/new/ckfinder/userfiles/files/38152045711.pdfIn PDF document text
    • http://vo23.ru/upload/file/89488655924.pdfIn PDF document text
    • http://vitalbafitnessclub.eu/userfiles/files/xetibaperajuzixugarudu.pdfIn PDF document text
    • http://an-ocn.ru/ckfinder/userfiles/files/tujojirixoporivumupanut.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/a2ea43c1be004f7bfeaf4b5f5521c5e2/wokefosaxodog.pdfIn PDF document text
    • http://vipacademy.org/userfiles/file/gabakor.pdfIn PDF document text
    • https://ladida.asia/sporlegen/administrator/imagetempfile/bamasanapadexusilixa.pdfIn PDF document text
    • http://z500.si/files/lerebilet.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/81460803482.pdfIn PDF document text
    • http://enslev-anlaegsservice.dk/userfiles/file/89142801737.pdfIn PDF document text
    • http://mywymc.com/userfiles/file/95140481681.pdfIn PDF document text
    • http://christ-china.com/filespath/files/20210902011330.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/momgcaq042qf6q0427o1j01lvb/fijomoga.pdfIn PDF document text
    • https://www.aaptuk.org/ckfinder/userfiles/files/puburenugiduru.pdfIn PDF document text
    • http://lukasikgroup.pl/Image/files/jevegoresinujefa.pdfIn PDF document text
    • http://hbaoge.com/upload/files/bogudikufapi.pdfIn PDF document text
    • http://newtarrytowndeli.com/uploads/files/pekeposamozisib.pdfIn PDF document text
    • https://davaocarrental.com/images/file/donobexuxurafewagixa.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/52b7e1e0e5d498370ff90f040c587002/17112089896.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/161378e675b32a---winet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=first+bnha+moviePDF 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_off00010b65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B65 22576 bytes
SHA-256: 191e844af75171c94f879f9fe13d698ee74ea86d188d71de98999223d05f415b
font_01_sfnt_off00014673.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14673 10508 bytes
SHA-256: 4ab4d79a67ba74885e78e2416ce0d18d622784854c381782aeb1bc1c73b6b3e5
font_02_sfnt_off00015e39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1