Malicious PDF — malware analysis report

Static analysis result for SHA-256 774e1dae818ad4ac…

MALICIOUS

PDF

81.9 KB Created: 2021-09-04 01:02:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cab7e966e1615b445beec7b65117435c SHA-1: 57b86a29feaf09ab7e87ce1bdf601de0cf6ff7be SHA-256: 774e1dae818ad4ac297451b3f1ad2844e2e08c0941aa3bc195a8a637faace929
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting. The ML classifier and ClamAV also identified it as malicious, specifically a phishing trojan. The document's structure and embedded URLs suggest an attempt to redirect users to potentially harmful content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://worshipedia.mobi/sites/default/files/file/janakedozaxubefokodij.pdf In PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1612549ada5ae8---42784724779.pdfIn PDF document text
    • http://edwindijk.nl/home/edijk/domains/edwindijk.nl/public_html/uploads/file/fanavunediwirixupufed.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/e378efd75d4fac249ff840b8a4d9456f/98925209195.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb2aa3f5a3---xijumisoluveto.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/9adc8d2300820011cf5034ad3b8b8061/40301392283.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/79418511776.pdfIn PDF document text
    • http://quocteanviet.com/img-chamthi/files/rizudefuxuvor.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083f9be126cc---duxoxa.pdfIn PDF document text
    • http://abovomedia.hu/_user/file/53797080566.pdfIn PDF document text
    • http://seventyfirstclassof69.com/clients/60772/File/7018570817.pdfIn PDF document text
    • http://halanmilk.com/upload/files/zepilomumufigilidevota.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/93834435411.pdfIn PDF document text
    • https://globportal.com/upload/userfiles/files/fanawowabebalefuv.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c07257af10b---47985735798.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/160719c331d318---nizejijivumo.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/97de22e9640f42bc232f333f9923357e/89807024809.pdfIn PDF document text
    • https://www.indoorclub-informa.com/boletines/img/file/palopomakakusajuvup.pdfIn PDF document text
    • http://dijladentalcenter-qa.com/userfiles/file/xavujafatalusisimugem.pdfIn PDF document text
    • https://taperagi.com/contents//files/11785426272.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/g9vr43vjj4lpj6621ebm6vs895/lifezonimuto.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16071494c0bde4---bibivijadivodaveguzesizi.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160daf68a0d133---lodozewivatijorax.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608db826ce0a9---71979540382.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=vertex+form+problems+worksheetPDF 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_off0000db3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f350.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF350 17660 bytes
SHA-256: ac0a90c9cf26172d34d52d3a14ebd7eb0184ef3f63c93e14883f6a133f9eb08e
font_02_sfnt_off0001217f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1217F 10652 bytes
SHA-256: ef7ee96edf55e39952d3d828fe17c22ddb4fdddce1c91acba5095067532a3534

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