Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1d00a07235026c6…

MALICIOUS

PDF

84.9 KB Created: 2021-08-20 07:19:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 605e7fae842533e68de437df98b07722 SHA-1: 74b86b9a3bf53b19a2d2c1649b2ca8d5dac1a076 SHA-256: c1d00a07235026c656980cad55dbac8e5d37b430a5cdfb89b277de3fc4bcac91
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple compromised websites, likely to host malicious documents or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. The presence of numerous links to compromised CMS uploads and disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16090fdc0748d2---wirigodubizenos.pdf In PDF document text
    • http://allaboutdowney.com/userimages/66945745592.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/ae8a49a3a910618e96e8beed1df49ec5/jetegokelalemuboziwa.pdfIn PDF document text
    • https://cpsguffanti.com/uploads/file/5286025112.pdfIn PDF document text
    • http://fkhd.cz/data/img/89557189052.pdfIn PDF document text
    • http://ylpcl.com/ckfinder/userfiles/files/11138373716.pdfIn PDF document text
    • https://www.avantagesapp.com/uploads/files/33848991796.pdfIn PDF document text
    • http://greenvisioninternational.gm/userfiles/file/24217630445.pdfIn PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/78ff145ecb9c682cea62af112d8f432b/xesixufipige.pdfIn PDF document text
    • http://aj-logistics.com/stock/userfiles/file/54033325408.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/9a3c5a31b399fb61e893bffa00a459c2/nefazetuvabodobuna.pdfIn PDF document text
    • http://clinicaveterinariabilancino.it/userfiles/files/65034139190.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/16074abf1d32ea---xasapuzamirugabubifivo.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1608f785e86716---40909103865.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/otlcvpc998f9h28rcoeu4b4r07/94202074832.pdfIn PDF document text
    • http://hifitness.hu/userfiles/file/32229785738.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160926cc58e480---51132764122.pdfIn PDF document text
    • http://fandimnarodaku.cz/upload/file/37803671940.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/7f0b66a8f06d873787ac96382bc1f4f3/67187262938.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160840a8ed40e7---texuxikitofu.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/zepinasonuxovakiwitaxu.pdfIn PDF document text
    • http://luxmeterthai.com/ckfinder/userfiles/files/87232969727.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=how+long+do+i+leave+splat+lightening+bleach+inPDF 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_off0000e789.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE789 17452 bytes
SHA-256: f7036f9a6a3d1722714cd59b744230f5d41161595122fb8f44c23f27b4180cf7
font_01_sfnt_off00011492.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11492 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ca9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CA9 10976 bytes
SHA-256: de01835376b194b4ad72a586c823d7c9f0f441071c5cb5fd5fff0c9afb36a19b

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